Spur Carbon Eagle 90

The Spur lineup consists of three carbon-framed builds, all featuring the updated UDH-compatible rear triangle. The range starts with the Carbon Deore, which offers a reliable entry point using a Shimano Deore 12-speed drivetrain, four-piston Deore brakes, and Fox Rhythm and Performance suspension. It rolls on aluminum WTB rims laced to Novatec hubs.

Stepping up to the mid-tier Carbon Eagle 90 introduces SRAM's GX Eagle Transmission for wireless shifting. This build upgrades the suspension to Fox Performance Elite components, featuring the highly adjustable GRIP X damper in the fork. It also moves to a DT Swiss M 1900 aluminum wheelset and SRAM Motive Bronze brakes.

The flagship Carbon XO AXS build maximizes weight savings and performance. It features top-tier Fox Factory suspension with Kashima coating, a SRAM XO Eagle Transmission, and SRAM G2 RSC brakes. The most significant upgrade at this level is the DT Swiss XRC 1501 carbon wheelset, which noticeably reduces rotational weight to complement the lightweight frame. Across all builds, Transition specifies a Maxxis Dissector front and Rekon rear tire combination, balancing rolling speed with cornering grip.

Reviewers consistently praise the Transition Spur for its ability to carry momentum across undulating terrain, frequently describing it as a "speed generating machine" (Theloamwolf). On the trail, the suspension provides a firm, supportive platform that rewards an active riding style. Instead of absorbing every trail nuance like a longer-travel bike, the flex-stay rear end provides distinct pop, helping riders generate speed by pumping through rollers and out of corners.

When pointed downhill, the bike's length and slack front end provide a level of composure rarely found in the 120mm category. Testers noted that the geometry effectively "slows down the trail" (YouTube), offering riders more time to process technical features at speed. However, this capability comes with a notable tradeoff. Because the geometry encourages aggressive descending, riders often push the lightweight chassis to its limits. In high-speed compressions or heavy braking scenarios, some reviewers felt the frame "winding up and springing back" (Bebikes) unpredictably.

A recurring critique across early reviews centered on the stock braking specification. Because the bike encourages high speeds, multiple testers found that it was easy to "outride the brakes" (Theloamwolf), particularly when earlier models shipped with smaller rear rotors. Despite this, the consensus remains highly positive, with testers agreeing the Spur excels for riders who want a highly efficient climber that remains composed on steep, rough descents.