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Mount Your 15mm Boost Wheel to Any 20mm DH Fork-Fast, Safe & Easy
Use your 15x110mm wheel on RockShox Boxxer, SR Suntour Rux38, or Fox40 forks—no tools required.
Convert A 20mm DH Fork to Fit a 15mm Boost Wheel
- Fits RockShox Boxxer, SR Suntour Rux38, and Fox40 (2019+)
- Installs in seconds—no tools required
- CNC-machined from strong, lightweight 7075 aluminum
- Made in Germany, tested by riders
- Same Day International Shipping with DHL
- Secure checkout: PayPal, Apple Pay, Credit Card
Why Mountainbikers Choose Freakynuts
“Saved me hundreds—now I use one wheelset for all my forks!”
Super, awesome product! A really cool thing that saves you so much time and money. I personally have several bikes and three Boxxer forks… Thanks a lot! Max
“No more hassle, just ride.”
Awesome concept! I actually had to buy a new rim after switching forks to a Rux38, and now I have two different rims – which really annoys me. But with this adapter, I can keep using my old wheelset. DH.
“One adapter, endless options.”
The Fox40 Adapter makes my life much simpler. I now dont have to carry around 4 front wheels for my DH and Enduro to be prepared for muddy and dry soil. The Team was really helpful in improving the product upon request. Thanks a lot! Yannick L
Why You shoud use this Adapter
Ride Smarter
Use your 15mm wheels on any 20mm fork—easy install, no tools needed.
No Hassle
Switch wheels in seconds—spend more time riding, less time fixing.
Durable & Tested
Made from aircraft-grade aluminum, proven in Europe’s toughest downhill parks.
Affordable Quality
Top performance without breaking the bank.
Join the Fork Adapter Revolution
Choose our Adapter and Ride whatever 15mm Boost wheel you like in a Rockshox Boxxer. a Rux38 or Fox 40.
More than a Product
The Freakynuts Adapter Set is more than just a product—it’s a revolution for mountain bikers who refuse to be held back. We created this solution because we’re riders who’ve faced the same frustrations you have. We believe in making biking accessible, fun, and hassle-free for everyone.
The Fastest Way to Ride Your 15mm Wheel in a 20mm Fork
- No tools needed—install in seconds
- Fits Boxxer, Rux38, Fox40 (2019+)
- Made in Germany, tested by riders
- CNC Machined Aircraft alluminum
- Same day international shipping
Tested by Riders, Proven in Europe’s Toughest Bikeparks
Since early 2024, we’ve pushed Freakynuts Adapters to the limit on our Commencal Supremes—riding hard in Bikeparks like Bikepark Leogang, Bikepark Samerberg, Bikepark Geisskopf, and Bike Republic Sölden.
Result:
Not a single sign of wear. 100% reliable—ride after ride.