mountainbike kit Stumpjumper HP Kit (2025-current) | US

mountainbike kit Stumpjumper HP Kit (2025-current) | US* This is a limited release of 20 units. Once they are gone, they are gone. * Imagine transforming your Stumpjumper into a whole new beastever wondered what itd be like if it sported a rearward axle path and an idler? Wonder no more. This kit does exactly what the name implies: it converts your Stumpjumper into a high pivot, chunder devouring monster. By creating a reward axle path, it helps the wheel sail over square edged impacts effortlessly,

* This is a limited release of 20 units. Once they are gone, they are gone. *

Imagine transforming your Stumpjumper into a whole new beast—ever wondered what it’d be like if it sported a rearward axle path and an idler? Wonder no more. This kit does exactly what the name implies: it converts your Stumpjumper into a high-pivot, chunder-devouring monster. By creating a reward axle path, it helps the wheel sail over square-edged impacts effortlessly, sending less shock through to you. And the numbers don't lie. Our tests show a significant reduction in vibrations at the bottom bracket, meaning smoother, more controlled rides.

In its stock form, the axle shifts rearward to around -2mm at sag, then pushes forward to +14mm at the bottom of the travel. But with our conversion, things get wild. The axle moves a massive -12mm rearward at 60% of travel, and by the end, it sits a whopping 21mm further back than the stock position. Yes, you read that right—21mm.

To make sure pedaling efficiency stays sharp without sacrificing comfort, we’ve introduced an idler that keeps chain growth in check. Compared to the stock setup, this means 25% less pedal feedback at the top of travel and, an even more impressive, 70% less at the bottom. The high-pivot design naturally gives you anti-squat, meaning you don’t have to rely on chain tension to fight against bob. The result? Smoother, more efficient riding without the usual compromises.

Attention to detail was the name of the game with this kit. It features touches such as sleek routing for the brake line that cleanly routes it inside the chainstay with a cover and a custom chainstay protector. Each part was meticulously machined at there are a lot of them.

Specifications:

• Stumpjumper 29" frames (2025 to current)
• Travel: 155mm (with stock 210×55mm shock)
• Progression increases to 18% compared to 12% with stock link
• Sealed Enduro MAX bearings
• Colors: Black, Silver
• See image carousel for graphs