Year to Year

All-New ARO™ Chassis

The all-new ARO optimizes a bike's performance by making more efficient use of the engine's power, delivers easy and responsive handling, and dramatically improves deep-snow performance.

Easy Installation & Conversion

ARO installation is faster, easier, and requires fewer tools. It's Direct Bolt-On System requires no bike modifications.

Traverse Ski

An efficient, tri-keel design that enhances cornering and handling on hard-pack and also improves deep-snow performance.

All-New ARO™ Rear Suspension

Features significantly greater travel for improved ride quality and reduced bottoming.

Traverse Track

Narrower track and revised gear ratio provide more power to the snow.

Shielded Brake

Engineered specifically for snow bikes to minimize ice build-up.


Lighter and more durable with improved performance plus no drilling required for installation.

ST 120 RAW

The Timbersled ST 120 RAW is the best priced Timbersled system…ever. It comes feature-packed; and full of Timbersled performance technology.

LE (Limited Edition) Models

Limited Edition Models featuring Fox Zero QS3r shocks.

New Side Panels

Lighter, stronger more aggressive side panels.

Updated Graphics and Colors

System graphics have been updated for 2017 and more color options are available for SnowCheck 2017 only.

New RMK I-Beam Rails and Bumpers

New EK X-Ring Chain

Timbersled Suspension Strut

TSS adds 8+ inches of plush, linkage-like suspension travel that gives the nimble dirt bike feel we’ve all been searching for!

Convex Pivoting, Long-Travel Suspension

The new pivoting long-arm rear suspension design provides a near perfect travel path that articulates in a convex motion, enabling a true tire-like feel.

Bottomless Rail System

Gives a never-ending suspension feel by absorbing those disc crushing  g-out forces.

Reactor Rear Suspension Arm

Our new arm is lighter, stronger, and eliminates any rear suspension stiction.

Dominator Drive System

A lighter, stronger and more efficient drive system.

Ultra Lightweight JT Splined Sprockets

We shaved off over 2lbs of rotating mass, and gear changes are easier than ever!

Efficient Double Row Upper Idler Wheels

They reduce rolling resistance, and help put more power to the snow.

Convex 2.5 Track

Tapered paddle design uses rigid outer and softer center paddles to maximize traction in all snow conditions.

High-Flow Intake System

Integrates with almost any dirt bike. Improves air flow and will accommodate EFI sensors.

HD Fork Clamp System

Stronger and taller fork clamps utilize a nylon insert that protects fork tubes and disperses impact forces.

Lower Seat

The rear suspension on the 2015 ST and LT kits was refined and mounted higher in the tunnel to create a lower ride height. The chassis was also reengineered to sit at a 4 degree flatter angle putting less weight on the ski, and biasing more weight to the track. This creates more traction, more controlled steering and significantly improves ride quality. It also allowed us to redesign the suspension rails, refine the bump stops, and recalibrate the rear suspension. This added 12% more available rear suspension travel over previous ST/LT models, all while lowering the seat height.

Tunnel Graphics

We designed new graphics to compliment the aggressive new performance levels achieved for 2015. Avaialble in standard (shown) or colored graphics to match the brand or decal colors of your motorcycle.

Drive System

The drive axle on the 2015 kits was rolled forward and up to create higher drive axle ground clearance and to tuck the track farther up under the bike. We also installed smaller diameter drive wheels to add even more clearance. These changes yield better deep snow performance because the drive wheels are now higher above the snow allowing the bike to have better flotation. The chain tensioner was also carefully analyzed, tested, and simplified into a stronger single bolt adjuster; making it easier to maintain proper chain tension. The tensioner sprocket location and role were also reengineered; and thoroughly tested and proven on both stock and turbo bikes. The drive axle bolts now have foldover locking tabs that securely lock them in place preventing them from coming loose. This eliminates the need to check tightness of the bolts.

Drive Bearings

"The 2015 ST and LT kits came equipped with the new rigid 4 bolt bearing housings and more efficient double row bearings. The engineered rigidity and structure of the new 4 bolt housings combined with other key drive train, side panel, tunnel, chain case cover and frame enhancements to produce a chassis that puts more power to the track and is designed to provide many years of troublefree service. This structural synergy also keeps the axles in alignment which should provide years of bearing life and rider confidence, especially for those with high horsepower or turbo bikes. Available on our Replacement Parts Page for all previous years"

Chain Case Cover

The 2015 chain case cover is made from a high impact Nylofiber plastic and bolts around the perimeter with 6 bolts. Internally the cover is designed with a reinforced impact zone around the outer perimeter to make it extremely impact resistant. The new shape of the cover rounds into the tunnel side with no square point. This makes it slither through the snow much smoother and deflect hard objects like rocks and stumps.


We redesigned the outer ski skags to provide more secure handling while cornering on hard packed trails. You can now lean into a corner on the trail and drive through it without the feeling that you need to hang your leg out for balance. The ski simply does not grab ruts and can hold a line on even the hardest trail conditions. Available on our Replacement Parts Page

Rear Suspension

For 2015 we modified the front arc of the rails for a flatter track angle that improved how the bike gets on top of the snow providing better deep snow floatation.

Brake System

The brake system was refined to create more clearance between the track and brake disc. With the added clearance the disc picks up less snow from the track creating more positive stopping power. Also the brake caliper was mounted lower in the frame creating less snow build up around the brake system.


The Tunnel top and sides were completely reengineered. To accommodate the lower ride height changes, a kick up in the back of the tunnel was added that regains track clearance, puts the grab handle in a more convenient location and brings a new more aggressive look to the Mountain Horse. The side panels were thoroughly tested and meticulously refined for added strength (both torsional and yield point), structural rigidity, and weight as the primary emphasis.

Brake Line

All MH kits now come with a 5’ brake line so that you have the option to use your factory hand brake master cylinder as your primary brake. However you will still have the option to use the stock foot brake with the stock brake line if you choose to. Available on our Accessories Page

Dual Track Center Skag

This new skag allows the 10” TS Backcountry ski to track 50% better than before. It allows you to ride down the trail with the comfort of minimal darting or shiftiness. This skag is also available for previous year TS Backcountry skis. Available on our Accessories Page

Mountain Tamer "Flex" Front Arm

The new front suspension arm has a side to side articulating motion that can be adjusted from 8° all the way down to 0° of motion (locked out). As you lean the bike the arm pivots allowing the rails to “Flex” side to side to create the leaning motion. This allows you to be able to lean more easily while the track transitions from flat to onedge when riding down the trail, making the snow bike feel more like you're riding on tires while the back portion of the suspension leans with the bike keeping the cutting edge portion of the track to remain effective while cornering. Available on our Replacement Parts Page

Back Shock Spring

There has been several internal and external changes made to the shocks but the most noticeable change is on the back shock. We have installed a heavier rate spring (200lb). It allows you to carry more tunnel cargo weight while running less spring preload to keep a supple ride. Also the front and back shocks have a simpler spring preload adjuster nut that is more userfriendly to fine tune your suspension.

LT Snow Flap

The LT kit now comes with a snow flap on the back of the tunnel to stop the spraying snow that comes off the back side of the kit when climbing. This snow flap will fit all previous model LT MH kits. Available on our Accessories Page

Color Change

All kits now come with a satin black powder coat finish. The satin finish stays looking good longer and easily shines up with detailer spray such as Maxima SC1 Clear Coat dirt bike silicone spray.

10" Wide Back Country Ski

This ski has been specifically designed for the snow bike by Timbersled. This ski will come standard on all kits. This ski is also available as an update to your existing Mountain Horse kit and any snow bike using a Polaris ski mount. Available on our Accessories Page

Custom Track

This track is a newly designed Camoplast Challenger that is single ply with a 2” lug by 12.5” wide by 2.86 pitch and comes in a 120” or 137” length. The track includes fewer paddles due to the wider track pitch yielding more traction.

Custom Side Rails

Our new slide rails are custom designed and built for the Mountain Horse. They utilize a single Ibeam design with a simpler and nicer look. They are 3 lbs. lighter than our previous rails.

Recalibrated Suspension

"The Mtn. Tamer back suspension has been retuned for better ski lift and a lighter feeling on the ski. It also has more independent articulation in the rails that helps the bike maneuver through the bumps. The suspension also sits 1/2” lower resulting in the bike sitting 1” lower in the seat."

Greasable Bearings

The new style drive axle bearing and bearing housing are designed specifically for the Mountain Horse. Not only can you grease the bearing with a grease gun but you can flush the bearing out with fresh grease. Each bearing has 2 holes in it, one on each end making it possible to pump grease in one end and out the other through the grease release hole located in the aluminum bearing housing. Available on our Replacement Parts Page

3 Models

Timbersled now offers 3 Mountain Horse models. ST (Short Track), LT (Long Track), SX (Snow Cross)

Sprockets and Chain

Wider ski spindle ears enabling more adjustment in the ski trailing of the spindle for added trail ride comfort. Steel sprockets made from heat treated 4140 chromoly steel. EK Oring chain

Break Caliper

Brake caliper redesigned to connect to the stock foot brake master cylinder or stock hand brake master cylinder (optional brake line needed for hand brake)

Fox Zero Pro Shocks

Fox Zero Pro sprung shocks with internal jounce bumpers. These shocks make the suspension smoother and are more bottom out resistant.

Hard Anodized Shafts

Hard anodized cross shafts throughout the back suspension. This reduces sticktion in all the moving parts and provides a more precision ride quality due to the hard bearinglike surface that the anodizing provides.

Single Limiter Strap

1 limiter strap compared to 2 on last year's model. The strap is wider for added strength and is on a bushing pivot at the bottom so that the strap folds in the same direction every time the suspension compresses. This produces a more precision ride because the 2 ends of the strap do not run into each other, a common problem that all snowmobile style suspensions have.