Backbone Wheelset (27.5") Project321 Hubs

Regular price $1,099.00 Save $-1,099.00
11 in stock

*USE SALE CODE HolidayAlloy AT CHECKOUT AND SAVE $100!

The Backbone is a sturdy 30mm internal 27.5 trail wheelset mountain bike wheelset. We improve the stiffness, strength and longevity of a wheel by using an asymmetric (ASYM) rim design than improves spoke tension balance by up to 30%. On the trail, this translates to balanced handling you can rely on in even the ruggedest of terrain. With a 30mm internal width it’s perfect for wide trail tires. 

Made just over the mountains from us in Bend, Oregon, Project 321 hubs offer absurdly fast, 216-point engagement and light-yet-strong alloy free-hubs. We use their “loud” pawl system for rock-solid reliability.

All Astral wheels feature a Tubeless Easy rim profile for painless tire installation and are hand-built in Eugene Oregon by people that care.

Need a special build? We can do that. Contact us for dream-builds or rebuilds and we’ll make it happen. Services also available through dealers
  • 27.5"  - Hookless, ASYM, tubeless ready
  • Rim Depth: 23mm Tubeless Clincher
  • Rim Width: [ex] 33.5mm, [in] 30mm
  • Tire size recommendation: See chart in product images
  • Includes: Taped for tubeless, tubeless valves and Astral's Certainty 

Build Specifications:


Project 321 Hub Build

  • Weight:  1665g
  • Spoke count:  28/28
  • Spoke type: Sapim Race, Round
  • Bearing: Precision Stainless
  • Front Axle Options: Boost, 15mm/Boost
  • Rear Axle Options: Boost, 142mm TA/ 135mm QR    
  • Freehub Options: Shimano 10/11 spd, or SRAM XD
  • Freehub Material: CNC Machined  Alloy, 216T high engagement, loud
  • Hub Body: 6-Bolt, CNC machined in Bend Oregon

*We do our best to ship your wheel order ASAP, but because many wheel orders are built to order, please allow up to one week for shipment once your order is processed.  Custom orders like color decals may take up to one week.
Backbone Wheelset (27.5") Project321 Hubs
Backbone Wheelset (27.5") Project321 Hubs
Backbone Wheelset (27.5") Project321 Hubs
Backbone Wheelset (27.5") Project321 Hubs
Backbone Wheelset (27.5") Project321 Hubs
Backbone Wheelset (27.5") Project321 Hubs
Backbone Wheelset (27.5") Project321 Hubs
Backbone Wheelset (27.5") Project321 Hubs