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What's the difference between boost and super boost hubs?


Asked by Kellen Nichols on Nov 30, 2021 FAQ



Boost 148mm 148 x12 or Boost spacing is the current standard for MTB rear hubs. It offers a significant improvement in stiffness and strength compared to 142mm. Chris King, Hope, Industry Nine, DT Swiss and Onyx offer all of their hubs in this spacing.
Moreover,
Boost refers to front hubs which are 10mm wider and rear hubs which are 6mm wider than ‘standard.’ Boost front hubs use the same diameter 15mm front and 12mm rear axles. By making the hubs wider wheels can be built which are stiffer, and more clearance is available for 11 speed drivetrains.
Keeping this in consideration, Boost gives a 148 x 12mm spacing which allows for the hub flanges to be further apart which gives a potentially stronger and stiffer rear wheel. What’s better than Boost? Super Boost!
Just so,
Boost 148 adds 3mm of spacing on each side of the hub. But unlike the 3.5mm difference from 135mm to 142mm, Boost 148 sees an increase in flange spacing, not just axle endcap width. Boost 110 uses a 15mm thru axle and moves hub flanges outboard by 5mm when compared to 100mm hub standards.
Also,
Race Face joins SRAM, Industry Nine, DT Swiss and others in offering Super Boost hubs. This raises two key questions for mountain bikers pondering a new bike purchase.