Santa Cruz Reserve 30 Carbon I9 XD Boost 29" Wheelset


Whether it's a sunset lap with friends or a race run against the clock, a broken wheel ruins any ride. Santa Cruz set strength and impact resistance as their highest priority, but strength doesn't have to mean uncomfortably stiff. Their wheels are compliant enough to avoid that harsh "wooden" ride that gives some carbon rims a bad name offroad. They only make offroad bikes at Santa Cruz, so they have the privilege of being able to focus purely on the mountain bike experience. Everything from the thickness of rim beads to external spoke hole reinforcements comes purely from our experience of knowing what riders need at every level—from international racing to your local trails.

This information in hand, Santa Cruz set about determining how they might design a rim to mitigate those failures, and part of the result is the square-shaped reinforcements you can see around the spoke holes. They made plates of different carbon spoke hole designs in our carbon lab in Santa Cruz, developed a test that mimics the sudden increase in pulling force associated with an impact, and spent a few months breaking bits of carbon, spokes, and nipples until we got to the point that they were breaking all spokes and nipples and no carbon.


Reserve 30

Wheel Size


Internal Width


External Width




Asym Offset


Spoke Count


Recc. Tire Width

2.3 – 2.6in

Front End Caps Options

Torque & Standard

Driver Body Options

XD or HG

Single Rim Weight


Complete Set Weights

(inc rim tape & valves)

DT350 Boost: 1831g

I9 Boost: 1811g

Chris King: 1943g

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