R4 Rear Hub


The R4 is designed to be a solid, reliable hub with a durable axle assembly and robust set of bearings.  We're using a tried and tested 4-pawl arrangement with 36 points of simultaneous engagement.  What sets it apart is the large radius that the pawls are positioned on, reducing leverage at the point of engagement. 

We opted for a Chromoly steel axle for stiffness and longevity.  Using steel allows a smaller diameter axle which in turn gives us more room to use larger, sealed bearings (we use USA made enduro bearings).  The rear axle assembly uses thread-on end caps which are easy to service and resist compression from the frames axle (they don’t fall off during trailside repairs either!).  R4 front hubs are available with standard or ‘torque’ end caps and rear hubs are available with XD, HG, or Microspline drivers.  We supply all parts for servicing to ensure that R4 hubs can be maintained well into the future!

Please select below which type of driver and/or end caps you need. If in doubt drop us an email. Spare parts can be found here.


Axle Diameter // 15mm
Spacing // Boost 110mm
End Caps // Regular or RockShox Torque (please request in order notes)
Tubeless // Tubeless Ready, Taped, Valves Included
Spokes // 32


Axle Diameter // 12mm
Spacing // Boost 148mm
Driver // XD, HG or Microspline (please request in order notes)
Tubeless // Tubeless Ready, Taped, Valves Included
Engagement // 4-pawl, 36 Point
Spokes // 32

Buy it with

BA 30 Rim Mountain Bike Wheel 27.5" 29 inch Rim Chromag Bikes

BA30 Rim

View product

Customer Reviews

Based on 3 reviews
Great hubs

No issues with these hubs. Smooth, good sound, good engagement. They're simple and easy to work on, and the exploded view diagrams are very helpful. Been running them laced to BA30s on my trail bike for almost a year. No complaints.

Great Quality

Solid hubs! No issues at all and I have been running them on the BA30 rims for about 7 months in all terrain, all weather. Still smooth as ever. Highly recommend!

James M.

If you're after super duper high engagement, then maybe this isn't the hub for you, but other than that they have been bomber. Having the choice of end caps and freehubs is nice too. And like the other guy said, the exploded diagrams makes it very easy to service and see what's going on.