Ritchey Adjustable 4-Axis Bike Stem, BB Black, 90mm length — 31.8mm clamp, ±55° angle adjust

The Ritchey Adjustable 4-Axis Bike Stem is a durable, forged-aluminum stem with a 90mm reach and a wide ±55° angle range to quickly tune handlebar height and reach without swapping parts.

This stem combines a light, strong 3D-Net forged 6061 alloy shaft with a precision broached clamp to deliver secure bar control and long-term reliability. Designed for modern cockpits, it accepts 31.8mm bars and a 1-1/8" (28.6mm) steerer, giving cyclists a flexible fit across road, gravel, commuter, and many mountain setups. Corrosion-resistant stainless hardware and a matte black finish keep it functioning and looking sharp through varied weather and mileage.

How does the +/-55° adjustability change my riding position?

The large angle range lets you move between upright and aggressive positions without changing spacers or stems. Small incremental adjustments change both handlebar height and reach simultaneously, making it easier to fine-tune comfort versus aerodynamics.

• Adjust angle quickly to customize reach and drop in seconds.
• Works as a long-term fit solution when trying new setups or handling multiple riders.
• Eliminates the need to buy multiple fixed-length stems for different riding styles.

Is this stem compatible with my handlebars and fork?

The Ritchey Adjustable 4-Axis accepts the industry-standard 31.8mm handlebar clamp and fits 1-1/8" (28.6mm) steerers, so it mates with most contemporary bars and forks. The 42.5mm clamp width provides stable contact with the bar, and a 40mm stack height fits typical headsets and spacers.

• 31.8mm clamp diameter fits road, gravel, and many flat bars.
• 1-1/8" steerer clamp suits most traditional threadless forks.
• 40mm stack height compatible with common headset spacers and seals.

How strong and light is the construction?

Ritchey uses 3D-Net forging on 6061 aluminum for a shaft that balances low mass and high load capacity, paired with a broached clamp for precise contact. The combination produces a dependable stem that resists flex under braking and sprinting while remaining light enough for performance-oriented bikes.

• Forged 6061 alloy shaft for high strength-to-weight performance.
• Precision broached clamp ensures an even, secure grip on the bar.
• Stainless steel hardware resists corrosion from road salt and rain.

What length, weight, and finish should I expect from the 90mm stem?

The model shown is 90mm long, offering a moderate reach favored by riders seeking slightly more upright posture than long stems provide. Ritchey quotes approximately 228g for a similar-length variant, and the BB black finish is durable and low-profile for many bike builds.

• 90mm extension balances reach and cockpit compactness.
• Claimed weight around 228g keeps overall bike mass down.
• BB black finish resists wear and blends with most frames.

Who is this for? The Ritchey Adjustable 4-Axis Stem suits riders who need a flexible, reliable way to dial in fit without swapping components — ideal for cyclists testing position changes, multi-rider bikes, commuters wanting ergonomic control, and mixed-surface riders who switch between comfort and performance. If your bike uses a 31.8mm handlebar and 1-1/8" steerer, this stem gives straightforward, precise adjustability with robust materials for seasons of use.