If riding a regular recumbent is easy and comfortable, then riding a recumbent trike is even better. With the EZ-Tri Classic recumbent trike, the rider gets the comfort and mechanical pedaling advantage along with the stability and confidence a trike brings. Try the EZ-Tri Classic for yourself and discover the wonderful world of recumbent trikes. - Fits riders with an X-Seam of 32 – 48"

We built the Thunderdome to celebrate the urban cycling and track-racing communities-the very heartbeat of All-City. Crafted from 7000 Series Aluminum, drilled for front and rear brakes, and now available as a complete bike for the very first time, this lightweight and responsive racer has proven itself on the boards of velodromes across the globe. Stripped down and race-ready, this scary-fast champ is ready to tear through left turns and track crits in record time. From distance to sprints, all this rocket asks is that you hold on tight. UCI Certified - Officially approved for full-on, heart-stopping track racing by the Union Cycliste Internationale, the world governing body for sports cycling. Drilled For Front and Rear Brakes - Race it brake-free in its natural habitat, or run front and rear brakes if you wanna take the Thunderdome to the streets. Round Profile Tubing - With a nod to classic styling and efficient performance, the Thunderdome boasts round profile tubing constructed from 7000 Series Aluminum. Carbon Fork - Outfitted with the lightweight Whisky No.7 RD Tapered carbon fork for high style and precise handling. Stainless Axle Pads - Replaceable stainless steel axle pads for increased durability. UID Paint and Polished Frame Accents - Our topnotch wet paint sparkles with depth and luster, contrasting with beautifully polished aluminum sections from the starting line to the photo finish. Classic Headtube With Modern Performance - Clean and stylish, a tapered headtube offers increased stiffness and improved cornering. Signature Seat Collar - Our fully custom Shot Collar seatpost clamp gets the job done with a little flair.

The Baja Trike is fashioned after Sun's wildly successful Baja Cruz, a two-wheeled model that first introduced the cycling world to wide-tired beach cruising. Now that same great experience can be had on three wheels! The Baja Trike gives you stability and comfort like never before. Fully featured, it comes with easy twist-shift gearing for hills and smooth, powerful disc brakes front and rear. With both fun and understated color options, the glossy frame and matching painted chain guard adds a touch of class and the high handlebars put you in control. Consider this the SUV of Sun's lineup, it puts in work and it still brings the party wherever it goes. - High-tensile steel easy step-through frame with direct mount rear derailleur and disc brakes - 7-speed SunRace gearing - Front and rear disc brake with brake lever actuated parking locks - Alloy extra-wide rims with stainless steel spokes - 24 x 3.50" Sand Storm street tires - Sun Trike high rise steel handlebar - Sun Trike deluxe saddle with double coil spring suspension - Steel chain guard - Custom tubular alloy rear basket with wood insert, 20"x15"x10"

The EZ-Classic SX is the perfect entry-level recumbent. With its smooth ride and comfortable, stable position, it's designed to provide years of use. And with 21 gears to choose from, it'll be a dream to pedal over most terrain. - Fits riders with an X-Seam of 33 – 48"

The Eco-Tad SX is the newest edition to the Sun Seeker tadpole trike family. This is our most affordable tadpole trike, but just because it's affordable doesn't mean that it isn't full of features. It has a fully adjustable mesh-back saddle with a padded bottom that keeps you cool and comfortable on long outings. Plus, there are spare bottle mounts on the seat frame to let you carry plenty of hydration for the long hauls. - Fits riders with an X-Seam of 31" – 53" (31 – 79cm)

Straggler is a bikepacking-inspired road/gravel bike mostly at home on pavement but ready for trail duty when called. Born on Gravel. Raised on Pavement Straggler is tuned for cross-over exploration on a wide variety of terrain conditions. It's a day-tripper and a weekender. It's a "rough road" road bike, a cyclocross bike with no pretense about racing, a utilitarian townie, a light-duty touring bike and an all-weather commuter. It's a steel gravel bicycle that thrives on the road. Think of it as a "mountain biker's road bike." If you only have room for one bike in your life, Straggler can (and should) be your one and only. Straggler's capabilities go well beyond asphalt. It also lends itself well to light touring setups. We're talking frame bags, seat bags, and "credit card touring" rather than full-blown touring. Straggler also handles our 8- and 24-Pack Racks well, so you have some heavier-duty loading options. - Accommodations for racks and fenders - Forward-exiting horizontal dropouts for singlespeed compatibility and wheelbase adjustability - Clearance for 700c x 41mm tires with fenders!

Breaking the Mold with a 29er Bike As the first "plus" bike to hit the market, Krampus changed the way many people approach trail riding. It's shown people the light of how high volume, large diameter tires can vastly improve the ride experience. It's also done a bang-up job dispelling the myth that big tires make you slow. Krampus is kind of like the opposite of a mullet: long in the front and short in the rear. With a long toptube and compact chainstays, it takes trail-shredding abilities to the next level. A mullet may be business in the front, party in the back but Krampus makes partying its business. "Lean back, hang on, and ride that wild horse." -Thor - Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles, suspension corrected fork - Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed though) - Clearance for 29" x 3" tires

Rangefinder is Salsa's confidence-building trail hardtail. Built for riders who want to start discovering their local trail systems, Rangefinder offers geometry and spec designed for the perfect introduction to mountain biking. Rangefinder opens up singletrack and doubletrack adventures and offers provisions for bikepacking setups so riders can expand their off-road repertoires. Rangefinder is mountain biking for the masses. - 6061-T6 alloy frame - Internally-routed shift, brake and dropper post housing - 139 mm suspension fork and dropper post - 1x drivetrain keeps shifting simple with plenty of gear range - Hydraulic brakes offer confident stopping power - Compatible with 29" or 27.5 plus wheels and tires - Carry what you need with the integrated top tube bag mount, two bottle cage mounts in the frame on M, L, and XL sizes, one accessory mount under the down tube, and rear rack mounts

Modern mountain bike trails are fun, flowy and challenging. This full-suspension 29er gets you in sync with the terrain, so you can ride with more confidence and have more fun. The lightweight and durable ALUXX aluminum frame features our FlexPoint rear suspension system for a smooth, balanced ride that keeps you in control. It gives you 120mm of smooth suspension travel in the rear and 130mm up front. Combine that with the added stability of 29-inch wheels and you get a confident ride to help you crush challenging descents and climb with greater traction and speed.

Steel Commuter and Gravel Bike Preamble is a hard-boiled steel commuter built for comfort, durability, and buffoonery on pavement and gravel. Nothing More is Needed. Nothing Less Will Do. The challenge was thus: Build a serious steel bike and give it only the attributes that matter most. Make it quick and comfortable on pavement, as well as confident and compliant on degraded surfaces. What the Enginerds put forth is Preamble, a pavement and gravel utility worker that proves you don't need to cut corners or clip coupons to make a more affordable steel bike. You just need to keep shit simple. Preamble can run racks and fenders and carry a couple water bottles. Surly was raised on stealing basic cable, after all. Smooth and efficient on asphalt, Preamble's double-butted main triangle provides a resplendent ride feel and withstands abuse from life's inevitable potholes. Make it your own with flat bars, drop bars, a basket, or bags. On the road to steel euphoria, Preamble is the gateway drug. Let facts be submitted to a candid world: - Offered in flat-bar and drop-bar configurations - Easy T-Shirt sizing to fit nearly every rider (XS, S, M, L, XL) - Sloping top tubes on XS and Small frames for improved standover and comfort - To offer the best rider experience for every frame size, XS and S frames get 650b wheelsets while M–XL get 700c - Custom-cast single-position vertical dropout

Discover a little mischief and unknown territory with the trail-ready Embolden, the perfect bike to get you onto the trails and singletracks. Trail Confidence 130 mm front travel and 120 mm rear travel, plus confidence-inspiring geometry, and disc brakes. Accessible Performance Equipped with single-pivot Flexpoint suspension design, and tuned specifically for women, Embolden is a highly capable, trail-versed dual suspension bike. Inspiring Comfort LivRight Sizing and 3F Design Philosophy guarantee a design built truly for women and the perfect fit across all frame sizes. Why We Love It Embolden is designed with women’s-specific geometry and 130 mm front/120 mm rear suspension, on a single-pivot Flexpoint platform. This bike feels stable, fast and energetic even as the terrain gets technical, meeting the demands of trail riding. Using our 3F Design Philosophy, we developed a geometry that provides a low standover height, making dismounts and maneuvering your body around the frame effortless. The 27.5-inch wheel size ensures that bike handling is still nimble and playful, while carrying more speed in corners and through rocks, providing a stable, trustworthy feel. - Frame: ALUXX-Grade Aluminum, 120mm FlexPoint Suspension - Fork: Giant Crest 34 RCL, 130mm, Boost, 42mm offset, custom tuned for Liv - Wheels: Giant AM 27.5, tubeless ready, sleeve-joint rim, 30mm inner width - Shifters: Shimano Deore - Crankset: Praxis Cadet Boost, 30T

Built with a lightweight ALUXX aluminum frameset and FlexPoint single-pivot rear suspension setup, Stance is a great way to improve your trail riding. Its 27.5+ wheel and tire compatibility give it a plush ride quality that soaks up bumps and adds more traction and stability. Combined with 120mm of smooth suspension travel front and rear, it's a confident ride that will have you nailing new lines.

All Ways, All Days. An urban-adventure bike for cities and town pathways, open countryside and everything else. Expand your horizons on one bike to do it all Where it thrives In town, Leisurely rides, On crowded streets What it's built for Visibility, Agility, Comfort Highlights - Light and durable SmartForm C3 Alloy frame / Suspension fork, 63mm travel, remote lockout - Shimano 9-speed drivetrain with hydraulic disc brakes. - Vittoria 700x40c multi-surface tires - Integrated connectivity with Cannondale App Smooth Lines Quick CX has been redesigned with a custom fork that seamlessly flows into the headtube for a refined and classy look Connect An integrated wheel sensor helps track your activity (like speed, distance, and calories burned), registers your bike, reminds you of needed service, and more, all through the free Cannondale App Intellimount Stem A convenient mount on the stem will securely hold any SP-Connect compatible smartphone case, creating a dashboard display for speed, mileage, and more with the Cannondale App Versatility Comes Standard Wanna get serious? The Quick CX comes with fender brackets for foul weather and universal, easy-to-use rack mounts for grabbing groceries and life on the go

Urban legend. The ultimate urban ride. Elegantly aggressive style. Forward-thinking features. Traffic-slaying performance. Where it thrives In town, leisurely rides, on crowded streets What it's built for Visibility, durability Highlights - Lefty Rigid fork - Shimano 16-speed drivetrain - Shimano hydraulic disc brakes Urban Armor Integrated top tube bumpers protect your frame when leaning and locking.

With Sun's Brickell 7 retro-style tandem, you and a partner can cruise the town effortlessly in style. Thanks to super-soft cruiser saddles, heaps of room for both riders, sloped top tubes for quick, safe dismounts and an upright riding position, this aluminum tandem boasts comfort and convenience. Plus, the 7-speed internal hub makes cruising over hills less daunting. What's more, handy features such as full fenders keep you both dry, linear-pull brakes deliver sure stops and extra-wide 26-inch balloon tires roll easily over bumpy paths and roads.

Take to the trail with a new level of confidence. With its grippy plus-sized tires and smooth-riding suspension, Stance gobbles up rocks, roots, and ruts so you get maximum traction and control on rough, technical terrain. Built with a lightweight ALUXX aluminum frameset and our innovative FlexPoint rear suspension, Stance is the perfect way to improve your trail-riding game. Its 27.5+ wheel and tire compatibility give it a plush ride quality that soaks up bumps and adds more traction and stability. Combined with 120mm of smooth suspension travel front and rear, it’s a confident ride that will have you nailing new lines. Plus-sized compatible - 27.5+ wheel and tire compatibility gives you added confidence and control on the trail. Proven suspension setup - FlexPoint rear suspension offers 120mm of travel (plus 120mm fork up front) for smooth-riding confidence on climbs and descents. High-quality aluminum frame - The lightweight, stiff, and durable ALUXX aluminum is hand-built and engineered in-house by the world leader in alloy bicycle technology.

Get your dose of singletrack on a fun hardtail that puts you in control. The combination of a lightweight hardtail frame, 130mm suspension fork, and 27.5 wheels with wide rims and high-volume tires delivers loads of traction, speed, and fun on the trail. With its updated ALUXX SL aluminum frame, quick-handling 27.5 wheels and high-volume tires, Fathom is a great choice for technical terrain and singletrack shredding. It blends the efficient ride quality of a classic hardtail with the confident ride quality of larger tires that absorb bumps and give you more traction—so you can tackle rougher trails with total control. The frame is designed with trail-friendly geometry that includes a more relaxed head angle and a 130mm suspension fork. Trail Tuned Design Balanced geometry with a 75-degree seat tube angle puts the rider in a powerful pedaling position on the climbs, while a slacker 66-degree head angle boosts confidence and control on technical descents. ALUXX SL aluminum frameset is hand-built in-house by the world leader in aluminum engineering. Responsive Handling Lightweight ALUXX SL aluminum hardtail frame offers agile acceleration and maneuverability to help riders climb, corner, and hammer the flats with efficiency and speed. Smooth Control Giant Crest 34 suspension fork with 130mm of travel absorbs roots, rocks, and ruts. Grippy, high-volume tires boost traction on rugged terrain. And, a dropper seatpost with handlebar remote lets you adjust saddle height on the fly for confident positioning on changing terrain.

Vaya is designed to handle any road surface, from pavement to gravel to dirt. Whether you’re on a fast tour or just taking your time, this all road adventure and light touring bike is a versatile machine that feels great lightly loaded or unloaded. Build this frameset into the Vaya that meets YOUR needs. The frameset is the perfect foundation for a highly capable all-road or light touring bike. Whether your focus is fast and playful for blazing around fire roads or robust and stable for off-pavement exploration, Vaya's game.

MODERN MOUNTAIN BIKE TRAILS ARE FUN, FLOWY AND CHALLENGING. THIS FULL-SUSPENSION 29ER GETS YOU IN SYNC WITH THE TERRAIN, SO YOU CAN RIDE WITH MORE CONFIDENCE AND HAVE MORE FUN. KEY PERFORMANCE FACTORS Attainable trail performance Handcrafted with lightweight, stiff and durable ALUXX aluminum, it's the perfect entry to full-suspension performance. Smooth suspension FlexPoint Suspension technology helps you tackle challenging terrain and improve your trail riding capabilities. 29er confidence and control Larger diameter wheels roll over rugged terrain with balance and stability, giving you the momentum to tackle technical climbs and the confidence to fly on singletrack descents.

GET YOUR DAILY DOSE OF SINGLETRACK. WITH A LIGHTWEIGHT FRAME, 130MM SUSPENSION FORK AND 27.5 WHEELS WITH HIGH-VOLUME TIRES, THIS HARDTAIL OFFERS LOADS OF TRACTION, SPEED AND FUN ON THE TRAIL. KEY PERFORMANCE FACTORS Trail tuned design Balanced geometry with a 75-degree seattube angle puts the rider in a powerful pedaling position on climbs, while a slacker 66-degree head angle boosts confidence and control on technical descents. Responsive handling Lightweight ALUXX SL aluminum hardtail frame offers agile acceleration and maneuverability to help riders climb, corner and hammer the flats with efficiency and speed. Smooth control Giant Crest 34 suspension fork with 130mm of travel absorbs roots, rocks and ruts. Grippy, high-volume tires boost traction on rugged terrain. And a dropper seatpost with handlebar remote lets you adjust saddle height on the fly for confident positioning on changing terrain.

GET YOUR DAILY DOSE OF SINGLETRACK. WITH A LIGHTWEIGHT FRAME, 130MM SUSPENSION FORK AND 27.5 WHEELS WITH HIGH-VOLUME TIRES, THIS HARDTAIL OFFERS LOADS OF TRACTION, SPEED AND FUN ON THE TRAIL. KEY PERFORMANCE FACTORS Trail tuned design Balanced geometry with a 75-degree seattube angle puts the rider in a powerful pedaling position on climbs, while a slacker 66-degree head angle boosts confidence and control on technical descents. Responsive handling Lightweight ALUXX SL aluminum hardtail frame offers agile acceleration and maneuverability to help riders climb, corner and hammer the flats with efficiency and speed. Smooth control Giant Crest 34 suspension fork with 130mm of travel absorbs roots, rocks and ruts. Grippy, high-volume tires boost traction on rugged terrain. And a dropper seatpost with handlebar remote lets you adjust saddle height on the fly for confident positioning on changing terrain.

Crank up steep climbs with smooth-rolling efficiency. Swoop down singletrack descents with stability and speed. This aluminum hardtail 29er features progressive trail geometry, a plush suspension fork, and dropper seatpost for the confidence you need to up your singletrack game. Built on an ALUXX SL aluminum frame, the Fathom 29 features updated geometry that produces a stable ride quality for challenging XC trails. The frame is optimized for a 130mm suspension fork for smooth control on the descents. An updated Giant WheelSystem comes with tubeless tires already set up, making it easy to experience added efficiency and control, plus a reduced risk of flats on technical terrain. Trail Tuned Design Balanced geometry with a 75-degree seat tube angle puts the rider in a powerful pedaling position on the climbs, while a slacker 66-degree head angle boosts confidence and control on technical descents. Responsive Handling Lightweight ALUXX SL aluminum hardtail frame offers agile acceleration and maneuverability to help riders climb, corner, and hammer the flats with efficiency and speed. Smooth Control Giant Crest 34 suspension fork with 130mm of travel absorbs roots, rocks, and ruts. Grippy, high-volume tires boost traction on rugged terrain. And a dropper seatpost with handlebar remote lets you adjust saddle height on the fly for confident positioning on changing terrain.

Crank up steep climbs with smooth-rolling efficiency. Swoop down singletrack descents with stability and speed. This aluminum hardtail 29er features progressive trail geometry, a plush suspension fork, and dropper seatpost for the confidence you need to up your singletrack game. Built on an ALUXX SL aluminum frame, the Fathom 29 features updated geometry that produces a stable ride quality for challenging XC trails. The frame is optimized for a 130mm suspension fork for smooth control on the descents. An updated Giant WheelSystem comes with tubeless tires already set up, making it easy to experience added efficiency and control, plus a reduced risk of flats on technical terrain. Trail Tuned Design Balanced geometry with a 75-degree seat tube angle puts the rider in a powerful pedaling position on the climbs, while a slacker 66-degree head angle boosts confidence and control on technical descents. Responsive Handling Lightweight ALUXX SL aluminum hardtail frame offers agile acceleration and maneuverability to help riders climb, corner, and hammer the flats with efficiency and speed. Smooth Control Giant Crest 34 suspension fork with 130mm of travel absorbs roots, rocks, and ruts. Grippy, high-volume tires boost traction on rugged terrain. And a dropper seatpost with handlebar remote lets you adjust saddle height on the fly for confident positioning on changing terrain.

Explore Further. Ride Freer. A capable, versatile gravel road bike. Built for chasing horizons, exploring routes less travelled or accelerating your commute. Where it thrives Gravel roads, out in the elements What it's built for Traction, handling, comfort Highlights - Light, Durable SmartForm C2 Alloy Frame with full carbon fork - Shimano Sora 9-Speed shifting - Promax Decoder R mechanical disc brakes - OutFront Geometry - Dropper Ready

Journey Ready An amazingly capable, versatile gravel road bike. Built for chasing horizons, exploring routes less travelled or accelerating your commute. Where it thrives Gravel roads, out in the elements What it's built for Traction, handling, comfort Highlights - Lightweight SmartForm C2 Alloy frame w/ full carbon fork - Shimano Sora 9-speed shifting - WTB Riddler Comp tires, 700x37c Wide Ranging Capabilities Clearance for big 45mm tires lets you push further into the rough stuff, and enjoy more grip and comfort on every ride. Easy to Live With. Easy to Love. Everything on the Topstone is designed for simplicity, ease of use and compatibility. Whether you're setting out on a big ride or taking the long way to work - less down time, more ride time. Load Up. Roll Out. With plentiful gear and waterbottle mounts on the frame and fork, Topstone is ready to load up and go long.

Urban legend. The ultimate urban ride. Elegantly aggressive style. Forward-thinking features. Traffic-slaying performance. Where it thrives In town, leisurely rides, on crowded streets What it's built for Visibility, durability Highlights - Lefty LightPipe fork with integrated light - Shimano Altus 18-speed drivetrain with hydraulic disc brakes - Alloy seatpost with integrated tail light LightPipe Lefty The wild Lefty fork is incredibly stiff for precise handling, and features a bright, integrated SuperNova LED light strip for added visibility and a one-of-a-kind appearance. LED Seatpost Super clean integrated LED lights in the seatpost add safety with style. USB rechargable. Urban Armor Integrated top tube bumpers protect your frame when leaning and locking.

Why follow tracks when you can make your own? Experience the "Foot out, flat out" fun of fat biking in any seasons. Whether you're tackling fresh snow pack or drifty sand dunes for days, the new Yukon will keep you rallying your favorite terrain in a whole new way.

Float through rock gardens. Feel the flow on technical singletrack. This full-suspension 29er makes it easy to experience the latest trail-taming technologies for a smooth, confident ride. Modern mountain bike trails are fun, flowy, and challenging. Stance 29 gets you in sync with the terrain, so you can ride with more confidence and have more fun. The lightweight and durable ALUXX aluminum frame features our FlexPoint rear suspension system for a smooth, balanced ride that keeps you in control. It gives you 120mm of smooth suspension travel in the rear and 130mm up front. Combine that with the added stability of 29-inch wheels and you get a confident ride to help you crush challenging descents and climb with greater traction and speed. Attainable trail performance - Handcrafted with lightweight, stiff, and durable ALUXX aluminum, it’s the perfect entry to full-suspension performance. Smooth suspension - FlexPoint Suspension technology helps you tackle challenging terrain and improve your trail riding capabilities. 29er confidence and control - Larger 29-inch diameter wheels roll over rugged terrain with balance and stability, giving you the momentum to tackle technical climbs and the confidence to fly on fast, rugged singletrack descents. - Frame: ALUXX-Grade Aluminum, 120mm FlexPoint suspension - Fork: Giant Crest 34 RCL, 130mm, custom tuned for Giant - Wheels: Giant AM 29 alloy, tubeless ready - Shifters: Shimano Deore - Crankset: Praxis Cadet, 30t

Quick bikes are the lightest in their class. Beautifully crafted aluminum frames and carbon fiber forks add up to a difference you can feel. Easier to pedal, easier to lift, easier to love! To blend speed with comfort, Quick uses road-bike style wheels fitted with larger volume tires for better bump absorption, grip and durability. Our OutFront steering geometry makes riding easier. It delivers agile handling, while positioning the wheel further out in front for more stability, more control and less chance of toe-overlap. An integrated wheel sensor helps track your activity (like speed, distance and calories burned), registers your bike, reminds you of needed service and more, all through the free Cannondale app. A convenient mount on the stem will securely hold any SP-Connect compatible smartphone case, creating a dashboard display for speed, mileage and more with the Cannondale App. The Quick's graphics feature bright 360° reflective elements for that extra measure of safety in low light conditions. - SmartForm aluminum frame with carbon fork - Cannondale Disc wheelset - 9-speed Shimano Sora components - Tekrto hydraulic disc brakes

CRANK UP STEEP CLIMBS WITH SMOOTH-ROLLING EFFICIENCY. SWOOP DOWN SINGLETRACK DESCENTS WITH STABILITY AND SPEED. THIS ALUMINUM HARDTAIL 29ER FEATURES PROGRESSIVE TRAIL GEOMETRY, A PLUSH SUSPENSION FORK AND DROPPER SEATPOST FOR THE CONFIDENCE YOU NEED TO UP YOUR SINGLETRACK GAME. Built on an ALUXX SL aluminum frame, the Fathom 29 features updated geometry that produces a stable ride quality for challenging XC trails. The frame is optimized for a 130mm suspension fork for smooth control on the descents. An updated Giant WheelSystem comes with tubeless tires already set up, making it easy to experience added efficiency and control, plus a reduced risk of flats on technical terrain. KEY PERFORMANCE FACTORS Trail Tuned Design Balanced geometry with a 75-degree seattube angle puts the rider in a powerful pedaling position on the climbs, while a slacker 66-degree head angle boosts confidence and control on technical descents. Responsive Handling Lightweight ALUXX SL aluminum hardtail frame offers agile acceleration and maneuverability to help riders climb, corner and hammer the flats with efficiency and speed. Smooth Control Giant Crest 34 suspension fork with 130mm of travel absorbs roots, rocks and ruts. Grippy, high-volume tires boost traction on rugged terrain. And a dropper seatpost with handlebar remote lets you adjust saddle height on the fly for confident positioning on changing terrain.