RADIO Sonar MTB 135 Freecoaster Hub

Radio Sonar Freecoaster Hub – finally, a freecoaster that works for MTB.

Most freecoasters are heavy, fragile, and a nightmare to maintain. The Sonar flips that script: built on a cassette-style system, it’s lighter, tougher, and way easier to live with. TheMagnaDrive magnetic pawlskeep things running smooth without springs giving up, and the oversized adjustable slack makes it feel natural both ways.

At33% lighter than most freecoastersand rolling with zero drag, it’s one of the fastest hubs out there—forward or fakie. After 4 years of testing with Niklas Tilk, Radio dropped a hub that actually makes sense for mountain biking:135mm spacing, disc mount, 10t or 12t driver.

Sonar Freecoaster HubSpecs

MATERIAL • 6061-T6 Alloy hub shell & 7075-T6 axle, stainless bolts
SIZE • 135mm x 10mm, 32h
BEARINGS • x5 sealed high-grade stainless bearings
DRIVER • 10t 1pc or 12t cog (mini hg) driver
color • black & nebula purple
DIMENSIONS • PCD (DISC) 58mm, PCD (R) 58mm, Flange Spacing 67.75mm, Flange Offset (DISC) 32.21mm, Flange Offset (DRIVE) 35.54mm

Features

MTB specific freecoaster hub with 135mm spacing
First hub of its kind in MTB, exclusive to Radio Bikes
Super lightweight hub using Wethepeople patented “HYBRIDSYSTEM” Internals
adjustable gap / slack
Zero drag system makes it one of the fastest hubs out
“MagnaDrive” Magnetic pawl retention system
Easily convertible into a cassette hub (all parts incl.)
10t one-piece driver or Mini HG cog driver (inc. 12t cog)
6 bolt-disc mount
33% lighter than a conventional clutch style freecoaster hub
Incredibly durable and maintenance-free system

Weight

• 457g / 16.1oz (12t)
• 442g / 15.6oz (10t)