STM POWERSPORTS

    STM clutch support brace designed to tie the primary and secondary together to prevent shaft flexing for improved performance and belt life.  ...

Tuner Secondary clutch for Can-Am X-3, Defender, Maverick trail/sport, 2021-on Commander All billet design, uses the STM Gen 1 ATV style helixes  ...

2.9" load 240 lbs 1.6" load 390 lbs. Ski-Doo - Snowmobile 2.9" Load - 240 lbs 1.6" Load - 390 lbs Largest selection of springs to tune from F...

2.9" load 280 lbs 1.6" load 420 lbs. Quick and easy tuning of engagement and top rpm with performance adjusting primary (drive) clutch springs ...

An affordable replacement for the stock primary clutch. Complete billet design that outperforms the existing primary. Using our adjustable SUPERTI...

Rage 4 Wide Captured Pin Primary Clutch  Completely Redesigned STM Rage 4WCP Primary clutch features a wider, thicker, more durable spider with ou...