Zipp’s SL Speed B1 is a lightweight unidirectional carbon ±6° stem with a 31.8 mm handlebar clamp and 1-1/8 in steerer interface, built around an aluminum universal faceplate secured by titanium Torx T25 bolts. The B1 graphic version came in matte carbon with stealth or white logos and uses SRAM Exogram carbon construction to deliver high stiffness at low weight for road, gravel, and cyclocross builds.

• Unidirectional carbon stem body with aluminum faceplate and titanium Torx T25 bolts.
• ±6° angle; reversible for rise or drop.
• 31.8 mm handlebar clamp; 1-1/8 in (28.6 mm) steerer clamp.
• Length options 70, 80, 90, 100, 110, 120 mm (B1).
• Stack height ~41 mm.
• Matte carbon finish; stealth or white decals depending on SKU.
• Compatible with Zipp Quickview integrated faceplate computer mount (sold separately).
• Rated for road, gravel, cyclocross use; no stated rider weight limit.
Weight: 120–123 g (based on 100 mm length; varies by size).