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TIMBERSLED

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9/17/2020
Customizing Your ARO Suspension Setup

Timbersled suspension diagram

The best suspension setting for your Timbersled snow bike system depends on many variables, including the riding terrain and the rider's weight, riding style and individual preferences. It is easy to adjust both the front (1) and rear (2) suspensions on your Timbersled ARO snow bike system. You'll make adjustments using the spring preload adjuster (3) and shock clicker (4), if equipped.

All shocks installed on Timbersled snow bikes are equipped with spring preload adjusters. For factory spring settings, see the suspension setup section for your particular model. Prior to adjusting spring preload, always lay the snow bike on its side or elevate it off the ground. The shocks must be fully extended for proper preload adjustment.

Caution: DO NOT EXCEED the MIN/MAX preload values (defined by the tables in this article). Never adjust spring preload shorter than the minimum allowable length. Adjusting shorter than this length could result in damage to the suspension. Failure to comply may result in injury or damage to equipment.

If you wish to customize the ride quality of your snow bike, complete the following procedure:

1. Ride your snow bike. Test ride your snow bike on your preferred terrain to feel out the factory suspension settings prior to making any adjustments. Optimal suspension settings can change depending on terrain and skill level.

2. Turn the bike on its side or elevate it so the shocks are fully extended. Always perform shock spring preload adjustments with the weight of the vehicle removed from the shock and the shock at full extension. Make spring preload adjustments in small increments (approximately 1/16 of an inch) and test ride the quality between adjustments.

3. Tune the vehicle balance using the rear shock preload adjuster. Adjusting the rear shock's spring preload affects the smoothness of your ride by controlling the amount of weight transferred. Heavier riders will typically require more preload than lighter riders. A spanner wrench (part number 2871095-329) is needed to adjust the preload on IFP and Walker Evans® shocks.

  • For LESS weight transfer, increase the rear shock spring preload by turning the preload adjuster clockwise.
  • For MORE weight transfer, decrease the rear shock spring preload by turning the preload adjuster counterclockwise.

For ARO bikes with monotube shocks (shocks with NO clickers), the rear track spring preload also can be decreased to decrease ride stiffness. It can be increased to increase ride stiffness and reduce bottoming out. However, for ARO bikes equipped with clickers, using the clickers is typically the best way to adjust for these ride quality characteristics.

4. Tune ski pressure. Manipulating the front shock spring preload in addition to the rear will adjust the snow bike's ski-to-ground pressure. If the ski-to-ground pressure is too heavy or light, the bike may experience difficulties in steering and stability on certain terrain.

  • If the ski-to-ground pressure is TOO HEAVY, increase the front shock spring preload and decrease the rear shock preload.
  • If the ski-to-ground pressure is TOO LIGHT, decrease the front shock spring preload and increase the rear shock preload.

For improved handling and additional control of the front ski, the Timbersled TRIO front shock can be added to the front forks and spindle.


Standard ARO Models: Timbersled IFP Shocks

I F P shock

All standard ARO models have Timbersled Internal Floating Piston (IFP) Shocks for both the front track and rear track. They utilize spring load adjusters to customize weight transfer and ski-to-ground pressure.

Timbersled IFP shocks are only adjustable through the spring preload (1). They do not have clickers for adjusting compression and rebound damping. Although the factory spring preload settings are usually sufficient for most riders, if you find adjustment is needed, NEVER adjust the spring preload beyond the minimum and maximum spring preload settings. Never adjust spring preload shorter than the minimum allowable length. Adjusting shorter than this length could result in damage to the suspension. Failure to comply may result in injury or damage to equipment.

I F P diagram

To customize the ride quality of a snow bike with Timbersled IFP shocks, complete the following procedure:

1. Ride your snow bike. Test ride your snow bike on preferred terrain to feel out the factory suspension settings prior to making any adjustments. Optimal suspension settings can change depending on terrain and skill level.

2. Tune vehicle balance using the rear shock preload adjuster (1). See above for preload instruction.

Front Shock Spring Settings

Model Front Shock Spring Rate Factory Installed Length Minimum Allowable Length
ARO 129 Timbersled IFP 150 8-13/16 in 8-7/16 in
ARO 129 S Timbersled IFP 250 6-1/2 in 6 in
ARO 137 Timbersled IFP 150 8-13/16 in 8-7/16 in

Rear Shock Spring Settings

Model Front Shock Spring Rate Factory Installed Length Minimum Allowable Length
ARO 129 Timbersled IFP 175 8-13/16 in 8-7/16 in
ARO 129 S Timbersled IFP 250 6-1/2 in 6 in
ARO 137 Timbersled IFP 175 8-13/16 in 8-7/16 in


ARO LE Models: FOX® QS3 Shocks

Fox Q S 3 shocks diagram

All Timbersled ARO LE models, including the Timbersled 3-Inch model, have QS3 shocks for both the front track and rear track. FOX® QS3 shocks are spring preload adjustable (1) and have clickers (2) for adjusting compression damping. This allows you to customize weight transfer and shock compression. DO NOT EXCEED the MIN/MAX prelad values (defined by the tables in this article). Never adjust spring preload shorter than the minimum allowable length. Adjusting shorter than this length could result in damage to the suspension. Failure to comply may result in injury or damage to equipment.

Remember to adjust your snow bike's spring preload first before moving on to adjust the clickers. If spring preload adjustment is needed, never adjust the QS3 shocks beyond their min/max preload values. Compression damping slows down (dampens) the shock compression that happens when the snow bike hits a dip, bump or other disturbance. The higher the compression damping, the slower the shocks will compress when encountering a disturbance.

Q S 3 shocks diagram

To customize the ride quality of a snow bike equipped with FOX® QS3 shocks, complete the following procedure:

1. Ride your snow bike. Test ride your snow bike on preferred terrain to feel out the factory suspension settings prior to making any adjustments. Optimal suspension settings can change depending on terrain and skill level.

2. Tune vehicle balance using the rear shock preload adjuster (1). See above for preload instruction.

3. Adjust shock compression using shock clickers (2). Tune the firmness of your ride by adjusting the shock clickers on the FOX® QS3 shocks. QS3 clickers have the following three positions:

  • 1. Soft: Turn the clicker all the way to its farthest counterclockwise position to achieve a softer or more plush ride with the least amount of compression damping.
  • 2. Medium: Turn the clicker one click from its soft position to achieve an intermediate ride (between soft and firm) with a medium amount of compression damping.
  • 3. Firm: Turn the clicker two clicks clockwise from its soft position for a stiffer ride with the highest amount of compression damping.
Front Shock Spring Settings
 
Model Front Shock Spring Rate Factory Installed Length Minimum Allowed Length
ARO 129 LE FOX® QS3 150 7-7/8 in 7-7/16 in
ARO 129 3 LE FOX® QS3 150 7-7/8 in 7-7/16 in
ARO 137 LE FOX® QS3 150 7-7/8 in 7-7/16 in

Rear Shock Spring Settings
 
Model Front Shock Spring Rate Factory Installed Length Minimum Allowed Length
ARO 129 LE FOX® QS3 175 7-3/4 in 7-7/16 in
ARO 129 3 LE FOX® QS3 175 7-3/4 in 7-7/16 in
ARO 137 LE FOX® QS3 175 7-3/4 in 7-7/16 in


ARO Velocity Models: Walker Evans® Velocity Shocks

Velocity shocks diagram
Timbersled ARO Velocity snow bikes are equipped with Walker Evans® Velocity shocks that utilize spring preload adjusters and clickers to customize weight transfer and shock compression. DO NOT EXCEED the MIN/MAX preload values (defined by the tables in this article). Never adjust spring preload shorter than the minimum allowable length. Adjusting shorter than this length could result in damage to the suspension. Failure to comply may result in injury or damage to equipment.

To customize the ride quality of a snow bike equipped with Walker Evans® Velocity shocks, complete the following procedure:

1. Ride your snow bike. Test ride your snow bike on preferred terrain to feel out the factory suspension settings prior to making any adjustments. Optimal suspension settings can change depending on terrain and skill level.

2. Tune vehicle balance using the rear shock preload adjuster (1, above). See above for preload instruction.

3. Adjust shock compression using the shock clickers (2, above). The Walker Evans® Velocity shocks come equipped with a black inside clicker and a red outside clicker. These clickers adjust the shock compression for high- and low-speed trail events. Note that "speed" refers to the rate of shock compression, not the speed of the vehicle.
  • The outside clicker (1, below) adjusts the shock compression during high-speed compression events (trails whoops, trail chatter, etc.). Turn the clicker clockwise to increase compression and counterclockwise to decrease compression.
  • The inside clicker (2, below) adjusts the shock compression during low-speed compression events (takeoff, G-outs, etc.). Turn the clicker clockwise to increase compression and counterclockwise to decrease compression.
Walker Evans Velocity shocks diagram
Shock Spring Settings
 
Shock Location Shock Type Spring Rate Factory Installed Length Minimum Allowable Length
Front Track Walker Evans® Velocity 150 8-13/16 in 8-7/16 in
Rear Track Walker Evans® Velocity 175 8-13/16 in 8-7/16 in
 

ARO 120 SX Models: FOX® 1.5 Zero LSC-R Shocks

FOX 1.5 Zero L S C - R Shocks

Timbersled ARO 120 SX models have FOX® 1.5 Zero LSC-R shocks for both the front and rear track. In addition to being spring preload adjustable (1), FOX® 1.5 Zero LSC-R shocks have two clickers that adjust compression damping (2) and rebound damping (3). Remember to adjust your snow bike's spring preload first before moving on to adjust the clickers. If spring preload adjustment is needed, never adjust 1.5 Zero LSC-R shocks beyond their min/max preload values.

Compression damping and rebound damping work hand in hand to provide a softer or stiffer ride. Increasing compression damping creates a stiffer ride by slowing down (dampening) the shock compression that happens when your bike hits a dip, bump or other disturbance. Increasing rebound damping also creates a stiffer ride by causing the shocks to rebound (extend back to their normal position) more slowly after compressing when the bike hits a disturbance. Too much rebound damping on bumpy terrain may not allow the shocks to recover quickly enough after a bump to allow the shock to be ready for the next bump.

The 1.5 Zero LSC-R shock clickers have a total of 24 compression damping clicker positions and a total of 25 rebound damping clicker positions, which allows for more minute changes and finer tuning of ride quality. The shock clickers can be turned all the way counterclockwise for a softer or plusher ride with the least amount of compression or rebound damping and can be turned all the way clockwise for the stiffest ride with the most amount of compression or rebound damping. Keep in mind that adjustments to the spring preload will require you to reset the compression and rebounding damping to find the best settings once again.

After setting the spring preload, it is suggested that you start with both compression and rebound damping set at their softest settings (clickers turned all the way counterclockwise) and slowly try out more compression and rebound damping until you achieve your perfect ride.

Shock Spring Settings

Shock Location Shock Type Spring Rate Factory Installed Length Minimum Allowable Installed Length
Front Track FOX® 1.5 Zero LSC-R 200 7-13/16 in 7-9/16 in
Rear Track FOX® 1.5 Zero LSC-R 200 7-13/16 in 7-9/16 in


Timbersled Suspension Strut SX Shocks (if Equipped)
The Timbersled Strut SX Shock Body suspension system (TSS) is designed to increase your snow bike's performance and enhance responsive steering and handling. The TSS is intended to work in harmony with the in-track rear suspension to create a dual rear suspension feel that is unique to a Timbersled snow bike. It is not intended to have a soft, squishy feel like the stock motorcycle rear suspension, and it's important that you do not try to tune it to feel this way. For maximum suspension performance, follow the tuning instructions.

Note that installation instructions are provided with the TSS accessory kit. For replacement instructions, see your Timbersled Dealer.

The TSS shock O-ring, found on the outer shock body, is designed to gauge the amount of shock travel. To measure the amount of shock travel using the O-ring, follow these steps:

1. Slide the O-ring down to the lowest position.

2. Ride the snow bike for approximately 10 minutes. Then shut down the engine and dismount the bike.

3. Elevate the snow bike so the weight of the vehicle is removed from the shock and the TSS shock is at full extension.

4. Measure how much the O-ring has moved. To do this, measure the distance between the O-ring's starting point (when moved down to its lowest point) and the O-ring's current location after a 10-minute ride.

The O-ring movement equals the amount of TSS shock travel. The TSS shock has a max travel distance of 1.5 inches to bottom out. It is recommended that the targeted amount of shock travel be about 1-1/8 inches of stroke.

5. Tune the TSS shock in increments of 25 psi to reach the targeted amount of shock travel (1-1/8 inches) and accomplish perfect calibration. Each time you make a pressure adjustment (of 25 psi), slide the O-ring back down to its lowest point and ride for approximately 10 minutes before rechecking your shock travel distance.

The TSS shock is preset from the factory with 260 psi. Use a FOX® Float air pump to adjust the spring rate and preload of the TSS shock. Your shock will have a sticker on it with the minimum, maximum and factory pressure settings. The suggested TSS pressures can be found in the following table. DO NOT EXCEED the minimum or maximum pressure values specified below. Pressurizing above or below these settings could result in damage to the suspension. Failure to comply may result in injury or damage to equipment.

Suggested TSS Pressures

 Setting  PSI 
 Minimum Setting   200 
 Factory Setting  260 
 Maximum Setting   400 

To tune the TSS shock:

1. Turn the bike on its side or elevate it so the weight of the vehicle is removed from the shock. 

2. Remove the shock's silver valve cap (1).

T S S shock diagram

3. Thread the pump onto the shock's valve stem until the pump pressurizes and the supplied pressure is readable on the gauge. During pressurization of the air pump, the shock will depress 20 psi to fill the pump hose. When checking the air pressure, compensate for this loss by adding 20 psi to the reading.

4. When finished, detach the air pump. When tuning your TSS shock, add or subtract air pressure in increments of 25 psi at a time. Do not get snow or water inside the valve stem. This could cause an air leak in the shock. After each 25 psi increment of adjusted air pressure, slide the O-ring back to the lowest position and ride your snow bike for approximately 10 minutes before re-checking the shock travel distance.
 

Timbersled TRIO Kit

The Timbersled TRIO is an accessory front shock. To change the air pressure, first use the supplied shock pump to set the air pressure in the EVOL chamber. To do this, locate the lower Schrader valve and attach the supplied pump. See the chart below for the recommended setting. To ensure proper ride characteristics, always set the pressure in the EVOL chamber first. Before setting air pressures, make sure the ski is off the ground so the shock is not under load and is fully extended.

EVOL chamber P S I settings

Next, set the air pressure in the main shock chamber. To do so, locate the TRIO’s uppermost Schrader valve and attach the supplied pump. Pump to the recommended setting shown on the chart below.

Main chamber P S I settings

Ensure all tools are accounted for and all steps have been completed. DO NOT exceed maximum pressures. Contents of shock are under pressure. Never incinerate or puncture and never disassemble without consulting your service manual. Any of those may result in serious injury or death.

EVOL air chamber tuning tips:

  • The infinitely adjustable pressure setting in the extra volume (EVOL) air chamber regulates spring rate in the final portion of the stroke and controls the bottom-out characteristics of the shock. Increasing air pressure in the EVOL air chamber will give a more progressive spring curve to protect against harsh bottom-outs. Decreasing air pressure will provide a more linear curve to maximize usable travel.
  • When combined with the infinite adjustability of the main air spring, the EVOL air chamber allows the shock’s spring curve to be tuned for any conceivable ride weight and/or terrain condition. The pressure in the EVOL air chamber is adjusted to control the bottom-out characteristics of the shock.

FOX® Float tuning tips:

  • Your TRIO main shock chamber is a FOX® Float shock specifically designed for Timbersled to increase spring rate, maintain ride height and improve the overall ride and handling characteristics of the snow bike.
  • For Timbersled TRIO shock applications, the recommended main chamber air pressure settings shown above are unique to the Timbersled TRIO application and should be followed to achieve the best overall ride characteristics.
  • The spring rate is controlled by air pressure in the main body. Air pressure is infinitely adjustable, making Float the most progressive and adjustable air shock on the market.

For more information about TRIO, see the installation instructions for the TRIO kit.
More maintenance information can be found in your Owner's Manual.
To view diagrams and find replacement part numbers, view the online parts catalog.

FOX® is a registered trademark of Fox Factory Inc.
Walker Evans® is a registered trademark of Walker Evans Enterprises Corp.