Thunder Shift Rollers
Superior Performance Through Superior Clutching

TRA Thunder Shift Rollers

The all new Thunder Shift Rollers (TSR) are another great tuning component for the Ski-Doo TRA clutch.  The TSR can be used with stock TRA arms or the adjustable Thunder Shift Arms.  Thunder Shift Rollers are available in Stock Ski-Doo size(10.0 grams), 1mm oversize (12.5 grams each) or 2mm oversize (15.5 grams each).  Thunder Shift Rollers are heat treated, Melonite coated for lubricity and bushed.  Thunder Shift Rollers are a bolt on high performance item from Thunder Products, Inc.

Here are some reasons you may want to use:
 Thunder Shift TRA standard size, 1mm or 2mm oversize Rollers:

1. You may want to use them for the weight
    * 1 mm oversize rollers weigh 2.5 grams more than the standard roller
    * 2 mm oversize rollers weigh 5 grams more than the standard roller
2. They give you more belt squeeze for a better hole shot.
3. The oversize rollers will raise your rpm's allowing you to run your clickers in a lower position.  Having your clickers in a lower number keeps your ramp angle shallower for better acceleration.  Lower clicker numbers also give you more usable numbers available for upward adjustment.
4. Melonite coated for lubricity saves wear on roller and weight arm.
5. Last and certainly not least, they cost much less than the stock rollers.