Forged aluminium construction and steel screws Ideal for wider tire applications with tire cross widths of up to 32mm Upper connecting rod not connected to the external one for more effective, precise movement, without contacting the limit stop Optimized inner cage plate design accurately accompanies the chain on the largest chainring Control activated micro adjustments make it possible to avoid chain contact even when crossing maximum gears FD19-RE12B 12sp Braze on BLK 81g High Mount Bottom DoubleUPC/EAN/GTIN: 8053340450082