The FSA OS-115 is a stiff, lightweight threadless road stem with a cold-forged aluminium body and a 4-bolt carbon-fiber faceplate for secure, precise 31.8mm handlebar clamping. Stiff, light alloy stem with a carbon faceplate — genuine FSA, brand new. Will it fit? 120mm length, 31.8mm bar clamp, for 1-1/8" (28.6mm) threadless steerers, with a ±6° flip-flop rise. Fits 31.8mm road, gravel/CX or MTB bars. Not for 1" or 1-1/4" steerers or 25.4/26.0mm bars. Key Specifications Brand FSA (Full Speed Ahead) Series OS-115 Model OS-115 MPN 175-3320 UPC 4710636251306 Type Stem Length 120mm Bar Clamp 31.8mm Steerer 1-1/8" (28.6mm) Rise ±6° (flip-flop) Stack Height 35mm Faceplate 4-Bolt Carbon Fiber Material AL2014/T6 Aluminium, cold-forged Hardware Titanium Weight 140 g (4.9 oz) Color Black Country of Origin Taiwan Condition Brand new — original FSA retail packaging Technology Highlights ✓ Cold-forged AL2014/T6 body for stiffness and low weight. ✓ 4-bolt carbon-fiber faceplate for secure bar clamping. ✓ ±6° flip-flop rise for fit tuning. ✓ Titanium hardware throughout. ✓ CNC-detailed for weight savings. What's in the Box 1 × FSA OS-115 stem (120mm, 31.8mm) 4 × carbon faceplate bolts Original FSA retail packaging Brand new in retail packaging. Ships from Ontario, California (US domestic) · Estimated delivery 3–5 business days · Free 30-day returns.
