Frame, Geometry, and Suspension Platform

The Blur C uses a carbon fiber front triangle and rear end — the “C” designating Santa Cruz’s mid-tier carbon layup, positioned below the CC (high-modulus) option. The frame is built around a 100mm rear travel system running a RockShox SIDLuxe Select+ rear shock. This is a dedicated XC shock with a lightweight air spring and low-friction damper tuned for high-cadence, seated pedaling efficiency. It uses a 12x148mm Boost rear axle spacing, which widens the rear triangle and stiffens the wheel interface — standard on performance XC frames.

The front axle runs 15x110mm thru-axle (Boost) to match. The bottom bracket shell is threaded, not press-fit — a notable choice that reduces creak complaints common on carbon XC frames with PF30 or BB92 standards. The headset is a Cane Creek Forty, a reliable, serviceable unit found on bikes at this price point.

Drivetrain: SRAM XX1 Eagle AXS

The drivetrain is where the $9,499 price is justified. SRAM XX1 Eagle AXS is a 12-speed wireless electronic groupset — one of two top-tier wireless mountain bike drivetrains on the market. The rear derailleur shifts via Bluetooth using rocker paddle shifters mounted to the bars. There are no shift cables to route, tension, or replace.

The cassette is the SRAM XG-1299 Eagle 10-50t — a 12-speed, 500% range cassette machined from a single piece of steel/titanium alloy. The 10-50t range eliminates any practical need for a front derailleur on XC terrain. The crankset is SRAM XX1 Eagle Carbon at 34t with 175mm crank arms. Carbon crank arms at this level reduce rotational weight at the pedal stroke, which matters over multi-hour XC efforts.

The chain is SRAM-spec (likely PC-XX1 Eagle). No chain guide is listed in the build, which is typical for XC-focused builds running a 1×12 setup with a narrow-wide chainring.

Cockpit, Contact Points, and Brakes

The cockpit runs Truvativ Atmos components throughout — a 750mm alloy handlebar paired with a 60mm, 0° alloy stem at 31.8mm clamp diameter. For XC race geometry, 60mm is on the shorter end and contributes to a more upright, efficient seated position. The 0° rise keeps the front end low.

Braking is handled by SRAM Level TL hydraulic disc brakes. The Level TL is a competent two-piston caliper but sits below the top-tier SRAM Code or G2 lineup — a reasonable cost-saving measure on an XC build where modulation requirements differ from enduro or trail riding. Braking power is more than adequate for 100mm-travel terrain.

The SDG Tellis dropper seatpost runs 31.6mm diameter with 125mm of travel. A dropper at this travel spec is modest by trail standards but functional for technical XC descending. The saddle is a WTB Volt with Cr-Mo rails — a mid-weight, performance-oriented saddle suited to sustained seated climbing.

Wheels and Tires

The wheelset is a standout spec: Reserve 30 SL carbon rims laced to Industry Nine Hydra hubs. The Hydra hub uses a 690-point engagement system — functionally instantaneous pickup that eliminates the dead spot in pedal stroke common on standard ratchet systems. On technical XC terrain where power delivery is intermittent, this engagement spec is genuinely performance-relevant.

Rim width is 30mm internal, appropriate for the 2.4″ tire spec. Both front and rear run Maxxis Aspen EXO TR 29″ x 2.4″ tires. The Aspen is a fast-rolling, low-tread XC tire in tubeless-ready (TR) configuration. EXO casing is a reinforced sidewall option — lighter than EXO+ but more puncture-resistant than standard. The tubeless-compatible setup allows lower pressures and eliminates pinch flats.

Frequently Asked Questions

What type of rider is the Santa Cruz Blur C XX1 AXS built for? The Blur C XX1 AXS targets cross-country racers and performance XC riders who prioritize low weight, efficient pedaling, and technical component specs over all-mountain versatility.

Is the SRAM XX1 Eagle AXS drivetrain reliable for trail use? Yes. The AXS wireless system is proven in race and trail conditions. Battery life on the derailleur runs approximately 20+ hours and charges via USB-C.

How does the Santa Cruz Blur C compare to the CC version? The CC uses a higher-modulus carbon layup that reduces frame weight compared to the C. Both share the same geometry; the difference is weight and cost.