Ski-Doo R Motion Torsion Spring

Sold by singles, if you would like to order a pair please change quantity to 2.

1.27/80 – This is the lightest spring we commonly see from BRP. It is supplied OEM on the Renegade Enduro, as Ski-Doo expects a portion of the rider and gear load to be carried by the air shock. On any other model, this spring would support a rider weight of only 100-130 pounds. On the Renegade Enduro or other air shock-equipped models, this spring easily supports a fairly large range from 150-220 pounds. Riders and gear over 250 pounds need lots of spring preload or a higher air setting in the shock and ride quality starts to deteriorate.

1.35/80 – This is the most common spring we see from BRP. It is standard on most older MXZ and Renegade Trail machines since the advent of the R Motion skid frame. On the 129″ and 137” skid frames we find it supports riders between 130-160 pounds with minimal preload. On the older 120” MXZ R motion sleds, this spring had a bit more leverage in the skid and supported 150-180 pound riders easily.

1.50/90 – This spring is found on some XRS models. Renegade XRS spring order models with tunnel adjust seem to have this spring installed as an upgrade over the std 1.35/80. This spring is good for 160-190 pound riders.

1.52/82 – This oddly specific spring showed up on the 2021 R Motion X skid frame as the Ski-Doo engineers correctly calculated that this new skid with its longer arms was taxing the shock and springs much harder than the previous R Motion skid frame. This spring in a standard R Motion skid will support a 165-195 pound rider, but in the newer R Motion X skid, it seems to only support a 130-160 pound rider.

1.66/80 – This is the spring the dealers call the ‘BIG BOY’ spring. It is the only spring most dealers seem to be aware of as it is the standard spring on the Ski-Doo Grand Touring models. This spring is a strong spring on the old 120” MXZ models supporting rider weights up to 220 pounds, but in the newer 129” MXZ R Motion chassis, we find it good for a 170-200 pound rider. In the newest MXZ R Motion X skid, it will hold up riders in the 150-180 pound range.

1.84/100 – This is our high-performance spring for aggressive riders in the 150-180 pound range. This spring has a very low preload so it runs a lower ride height and can’t carry a ton of gear. Engines run cooler as the snow flap is lower to the ground. Super light centre shock spring rates need to be run with this rear spring. It is a great spring for aggressive, lighter riders that don’t carry a ton of gear.

1.94/90 – The spring is dimensionally longer than most other springs, so it has been our safe go-to stronger spring for the new R Motion X skids, especially the Renegade Models. The new longer centre and rear arm in the R Motion X skid has moved everything back with the increased leverage and many of the other above springs run the danger of falling out of the plastic spring guide if running the limiter strap at full length. In the R Motion X skid, this spring supports riders from 160-190 pounds. We really don’t use this spring in the older R Motion skid frame.

1.99/90 – This spring is one of our biggest sellers for the standard R Motion Skid frame. It supports riders from 200-240 pounds. It has slightly less preload than some of our other springs (90 degrees vs 80 degrees) so it doesn’t top up aggressively over hills or when ridden hard through the whoops.

2.3/100 – This is the strongest spring we currently inventory for the R Motion Skid frame. It is the strongest spring BRP sells. In the R Motion MXZ and Renegade platforms, it will support riders in the 270-300 pound range. For riders or rider and passenger loads above 300 pounds we currently just suggest adding preload to this torsion spring. Generally, for loads of this size, the sled is not being ridden aggressively, but if it is, the low preload number (100) helps the sled stay off the scissor stop cresting or jumping.

Note: For R motion riders in the 240-270 pound range We will recommend one 1.99 kg and one 2.3 kg spring. This is very common for us and doesn’t hurt the skid frame at all. The skid is bolted to the tunnel in four places. The two springs just average the workload and work just fine. Motorcycles often run different spring rates in the two forks and they just average out perfectly. Some newer motorcycles take this to the extreme and run only one spring in one fork leg with the damping cartridge in the other leg! As long as you drive the bike with the axle and front-wheel installed (which is HIGHLY recommended lol), you will be just fine. Along this same line of thought, feel free to stagger your preloads from left to right to give you more and finer tuning options as you try to hit sag. You don’t have to have them matched, the skid doesn’t care, it operates as one system left to right. However, if you have your two ski shocks set dramatically differently you will adversely affect the handling and turning because they are independent of each other.

The correctly selected stronger torsion spring will NOT make your ride much stiffer! The goal of a selected torsion spring is to support YOUR weight at the general target of 3-3.5” of rider sag at minimal preload, not at MAX! If this is accomplished with the right spring at a low preload number the sled will not BANG against the scissor stop aggressively when jumped, and will be strong enough to just engage your coupler blocks occasionally when you want it to, NOT ON EVERY BUMP. The correct spring will help you accomplish this. Imagine riding for 10 minutes without banging up against the scissor stop as you crest hills and thumping into bottom (or coupler blocks) on G outs! THAT is comfort!.