The original Freakynuts 15mm Adapter for the Marzocchi Bomber 58. CNC-machined from 7075 aircraft-grade aluminum in Germany. Trusted by thousands of riders worldwide.
Why We Built the Marzocchi Bomber 5815mm Adapter
Every mountain biker knows the problem.
Your trail bike, enduro bike or e-bike uses a 15×110 front wheel, while your Marzocchi Bomber 58 downhill fork still requires a traditional 20×110 axle in NON BOOST Configuration.
Buying a second front wheel simply doesn’t make sense. So we designed the solution ourselves.
Not a cheap sleeve. Not a universal compromise.
A completely engineered adapter system that allows you to ride your existing 15mm wheel in your Marzocchi Bomber 58. But also for the 15mm Boost wheel Riders we can offer a Fix that let you ride your 15mm Boost wheel in this great NON Boost Fork.
Built for people who ride hard.
CNC Machined in Germany
Every Freakynuts® adapter is manufactured in Germany on state-of-the-art HAAS CNC machining centres.
Every part starts as a block of premium 7075 aircraft-grade aluminium, one of the strongest aluminium alloys available.
Why 7075? Because downhill riding doesn’t forgive weak materials.
It offers:
- Exceptional strength
- Maximum stiffness
- Outstanding fatigue resistance
- Long service life
Every adapter is machined to extremely tight tolerances for a perfect mechanical fit.
Precision That You Can Feel
Cheap adapters rely on oversized tolerances.
We don’t.
Our adapters are manufactured with extremely precise fits.
That means:
✅ Zero unwanted movement
✅ Perfect clamping
✅ Improved steering precision
✅ Better braking feel
Every component fits exactly where it belongs.
Three Versions For Every Rider
1. Basic Adapter
Perfect if you already own a quality 15mm thru axle. (Non Boost)
You receive only the precision adapters. Affordable. Simple. Reliable and you can use your own 15x110mm Thru Axle with a length from 175mm.
Basic Kit: Convert your 20×110 DH fork to a 15mm axle in minutes — no new hub needed. Adapter kit without axle — use any standard 15mm thru axle (158mm length). Made in Germany. Precise fit, simple and effective solution.
2. Pro Kit
Want maximum stiffness?
Choose the Pro Kit. Includes our KingPin 175mm solid 7075 thru axle. (Non Boost)
A completely solid Extra-long Axle is added to the Basic Kit. Extremely rigid. Perfect for aggressive riding.
Pro Model Convert your 20×110 DH fork to a 15mm axle in minutes, no new hub needed. Includes our solid 7075 KingPin / HellPin axle for maximum strength. Made in Germany. Strong, precise and play-free fit.
3. Premium Kit
This is the flagship.
The Premium version combines the adapter and axle into one innovative two-piece system. Less loose parts. Maximum rigidity. Better load distribution.. (Non Boost)
Simply put:
Premium Model Convert your 20×110 DH fork to a 15mm axle in minutes, no new hub needed. Worldwide unique 2-piece system (solid 7075 axle + sleeve). Made in Germany. Bomb proof, play-free fit.
Bomb Proof.
Designed for riders who trust their equipment on the biggest jumps and fastest descents.
Rampage. Bike Parks. World Cup tracks. No problem.
Brake Rotor Rubbing the Caliper Mount? We’ve Got the Solution.
Is your brake rotor scraping against the brake caliper mount? We have the perfect fix.
This adapter allows you to fit a 15 mm Boost front wheel into a Marzocchi Bomber 58 NON BOOST fork, because the Bomber 58 still uses the non-Boost standard. It’s a simple and reliable solution that provides the clearance you need while maintaining proper alignment and performance.
Premium Boost Converter Convert your DH fork to run a modern 15×110 Boost hub in minutes, no new fork needed.
World-first 2-piece system (solid 7075 axle + precision sleeve). Made in Germany. Bombproof, play-free fit.
Available in Multiple Anodized Colours
Performance is one thing.
Style matters too.
That’s why the Freakynuts® Marzocchi Bomber 58 Adapter is available in multiple premium anodized finishes.
Choose the colour that matches your bike.
- Black
- Gold
- Raw Aluminium
More colours continue to follow.
Tested by Thousands of Riders Worldwide
The Freakynuts® adapter has been used by riders across the globe for years.
From weekend trail riders to freeriders and downhill racers.
Thousands of successful installations.
Thousands of happy customers.
One proven system.
Worldwide Shipping
We ship worldwide.
USA Customers
Orders inside the United States are shipped from our Colorado warehouse.
Benefits include:
- 🇺🇸 Free USA Shipping
- No Import Duty
- No Customs Fees
- Faster Delivery
Visit our dedicated US Store:
👉 15mmForkAdapters.com
Compatible Forks
The Freakynuts® system fits:
- Marzocchi DH58 (latest generation)
More models are continuously being added.
Why Riders Choose Freakynuts®
✔ Designed specifically for Marzocchi Bomber 58 forks
✔ Precision CNC machined in Germany
✔ HAAS manufactured
✔ Premium 7075 aircraft aluminium
✔ Zero play
✔ Extremely precise fit
✔ No fork modifications required
✔ Available in multiple colours
✔ Worldwide shipping
✔ USA warehouse
✔ Thousands of satisfied riders
✔ Ride your existing 15×110 Boost wheel
Ride Your Favourite Wheels Everywhere
One wheel. One adapter. Unlimited riding.
Whether you’re riding your local bike park, racing downhill, chasing KOMs or sending Rampage-sized features…
Freakynuts® delivers the strongest and most precise Marzocchi Bomber 58 15mm adapter available.
Ride without compromise.