Shimano BR-R451 Dual-pivot Calliper 57 mm Drop Front Brake in BlackBrand:Shimano Code:VARBRR451BLKGood value 57 mm drop front calliper brake.

Features:
Super slr dual pivot design keeps operating friction to a minimum, improving braking performance
Must be used in conjunction with st-4600, st-4603, st-5700, st-5703, st-6700 or st-7900 stis for correct leverage ratio
Enhanced brake arch proportions give a quicker linear response and increased power
57 mm drop
Lightweight aluminium calliper design with tough anodised finish
Toe-in adjustable brake shoes for perfect pad alignment
Durable quick release for fast and easy wheel removal
Comes with 10.5 / 12.5 / 18 / and 27 mm sunken nut