Features:
Fit : for Shimano 12s Di2 Dura-Ace R9250 R9200/ Ultegra R8150, R8170, R8100/ 105 R7150, R7100/ FORCE AXS
Support: only fit 10s, 11s, 12s road bike, NOT fit for mountain bike
Function: if want to use super big/small tooth like 46T or 54T 55T chainring, you need to make the front derailleur higher or lower, this extender can help to reach this target
Rise/lower distance: 15.5mm
Material: 304
Weight: about 9g
Package contents:
1 x 12s extender
Notice: This extender only for road bike use, not for mountain bike!!
STONE — Race-Ready Precision
Trusted by riders worldwide and favored by EU & USA race teams, STONE is built for high-load riding and competitive performance.
Using aerospace-grade 7075-T651 aluminum from Alcoa and Aleris, STONE achieves exceptional stiffness and durability, with a tested lifespan of up to 15,000 km.
High-precision CNC machining within 0.03 mm tolerance guarantees efficient power transfer, minimal noise, and stable shifting under pressure.
Engineered for racing. Proven on the road.
