Quick Summary
The Ritchey Adjustable 4-Axis Bike Stem is a 90 mm bike stem with a 31.8 mm handlebar clamp and a 1-1/8 in steerer clamp. It is built for riders who want an adjustable stem with a +/-55 degree angle range and a compact 90 mm extension.
The stem is described with a forged 6061 alloy shaft, a precision broached clamp, stainless steel bolts, and a BB black finish. The included fit details matter most if you are matching bar and steerer sizes on a modern cockpit.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Brand | Ritchey. Helps identify the exact stem line. |
| Product type | Adjustable 4-axis bike stem. A stem choice depends on bar and steerer compatibility. |
| Length | 90 mm. This affects reach and cockpit setup. |
| Handlebar clamp | 31.8 mm. Match this to the handlebar clamp diameter. |
| Steerer clamp | 1-1/8 in (28.6 mm). Match this to the fork steerer size. |
| Angle adjustability | +/-55 degrees. Useful when comparing cockpit position options. |
| Clamp width | 42.5 mm. A useful size check for the bar interface. |
| Stack height | 40 mm. Helps with front-end setup planning. |
What to Compare Before Buying
- Bar clamp diameter: This stem uses a 31.8 mm clamp. Compare that size to your handlebar.
- Steerer size: The clamp is sized for 1-1/8 in (28.6 mm). Confirm your fork steerer matches.
- Reach: The 90 mm length affects cockpit reach. Check whether that length fits your position preference.
- Angle range: The +/-55 degree adjustment changes the stem position. Make sure that range fits your setup goals.
- Front-end stack: The 40 mm stack height is part of the fit equation when planning the cockpit.
Compatibility, Size and Fit
This stem is listed with a 31.8 mm handlebar clamp and a 1-1/8 in (28.6 mm) steerer clamp. Those two measurements are the main fit checks before choosing an offer. The 90 mm length and 42.5 mm clamp width also affect the way the cockpit is set up.
The adjustable angle gives another fit variable to compare if you are trying to fine-tune handlebar height and reach.
Before You Decide
Confirm the 31.8 mm handlebar clamp, the 1-1/8 in steerer clamp, and the 90 mm length before choosing an offer. If you are changing cockpit position, also compare the +/-55 degree adjustment range and the 40 mm stack height with your setup goals.
Installation Check
For installation, consult the stem and bicycle manufacturers’ instructions for the correct fastener sequence and torque values. Do not assume a value from another stem applies.
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