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Race Face Atlas Mountain Bike Stem, Black, 31.8 mm Clamp, 50 mm

$79.99 (Price correct as of 11/12/2026 12:39 PST · Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

The Race Face Atlas is a black mountain bike stem with a 31.8 mm clamp, 50 mm length, and 1-1/8-inch steerer size. It also uses 6061-T6 aluminum and a four-bolt bar clamp with interlocking U-shaped clamp geometry, so matching the handlebar and fork setup matters before buying.

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SKU: B008CC2XTE Category:

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Quick Summary

The Race Face Atlas is a mountain bike stem in black with a 31.8 mm clamp and 50 mm length. It is a stem for handlebars that use the stated clamp size, and the fit should be checked against the rest of the cockpit before buying.

Key Details

Detail Product information and buyer relevance
Product type Mountain bike stem for handlebar setup.
Brand Race Face.
Model Atlas.
Color Black.
Clamp size 31.8 mm clamp, so the handlebar must match that size.
Length 50 mm, which affects cockpit reach.
Material 6061-T6 aluminum.
Handlebar clamp design Four-bolt bar clamp with interlocking U-shaped handlebar clamp geometry.

What to Compare Before Buying

  • Clamp size: Match the stated 31.8 mm clamp size to the handlebar you plan to use.
  • Stem length: The 50 mm length affects cockpit reach, so compare it with your fit preference.
  • Steerer size: The stem is listed with a 1-1/8-inch steerer size, so confirm your fork and setup match.
  • Construction: The stem uses 6061-T6 aluminum, which is a key detail if you compare materials across stems.
  • Clamp design: The four-bolt bar clamp and U-shaped geometry are useful details to compare against other stem designs.

Before You Decide

Confirm the 31.8 mm clamp size, the 50 mm length, and the 1-1/8-inch steerer size before choosing an offer. Make sure the stem matches your handlebar and fork setup, and follow the manufacturer’s instructions for installation.

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