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Crank BrothersSynthesis XCT Carbon Boost Wheelset - 29in


Item # CRN004W

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  • Black, 15x110/12x148, XD ($1,699.00)
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Item # CRN004W

Synthesis XCT Carbon Boost Wheelset

Mountain bike technology has progressed rapidly over the past 5 years, but one place that could us some improvement is carbon fiber wheels, which can have a harsh ride quality that may not actually improve performance over their aluminum counterparts. Crank Brothers aims to change that with the Synthesis XCT Carbon Boost Wheelset. These new-age hoops are specifically tuned for XC racing, putting both stiffness and compliance together in a single wheelset by crafting one rear-specific wheel, with elevated stiffness for exceptional tracking, and the other front-specific, tuned for compliance, grip, handling, and a bit more vibration damping. These are each laced up with different spoke counts, landing with a stiff rear-wheel that doesn't compromise tracking in steep and loose corners, and a front wheel that holds its line, and soaks up harsh trail chatter.

To start to understand the Synthesis XCT Wheelset, we need to look at the differences between each rim. The front rim uses a wider profile, with an inner rim width of 26.5mm that supports wider tires and does a better job absorbing trail chatter, meanwhile amping up the traction to keep you locked into your line in loose corners. This rim is laced up with 28 spokes — 4 fewer than the rear wheel, allowing just a little more compliance to elevate vibration damping. In the back, Crank Bro's opt for a slightly narrower rim with 24.5mm internal width, laced up with a whopping 32 spokes for a stiffer feel that offers undeniable control, power, and tracking.

This version of Crank Brother's Synthesis Carbon Wheels finds itself laced up neatly to the Synthesis Standard hub. While we admit, it isn't quite as flashy or fancy as the Synthesis 11 on its counterpart, the Standard still offers quick 17-degree engagement, which is plenty to get you up and over punchy climbs, and it comes with a significant savings to your pocket book, so you won't have to spend all summer apologizing to your significant other for the dent you put in your savings.

  • A tuned carbon wheel system for XC riding and racing
  • Front-and-rear specific hoops balance stiffness and compliance
  • Front wheel is compliance-tuned for better grip and control
  • Extra-stiff rear wheel boosts stability and tracking
  • Wide front rim has room for lofty tires for extra traction
  • Reduce rolling resistance with narrower rear rim
  • Balances low weight with durability at 1554g for the set
  • Lifetime warranty on carbon rims for peace of mind

Tech Specs
Rim Materialcarbon fiber
Wheel Size29in
Tire Typetubeless
Rim Depth19mm
Rim Width[front internal] 26.5mm, [front external] 31.1mm, [rear internal] 24.5mm, [rear external] 29.5mm
Brake Compatibility6-bolt
HubsSynthesis Standard
Front Axle15 x 110mm Boost
Rear Axle12 x 148mm Boost
SpokesSapim D-Light
Spoke Count[front] 28, [rear] 32
Recommended Usecross-country, trail
Manufacturer Warrantylifetime on rims

Claimed Weight

Claimed weights are provided by the vendor.

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[set] 3lb 6.8oz

Actual weights are measured in-house by the Competitive Cyclist team.

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What do you think about this product?



Does this wheel set support GX eagle and if not could it use the XD body driver to support the cassette?

Hey Jaden, great question, thanks for asking! Yes, this is the XD freehub, so it will work with the SRAM GX and up.