Shimano tiagra r550 flat bar brake leverscaliper brake levers designed specifically for flat handlebars aluminium lever and bracket keep weight low while a tough finish keeps the bike looking good features caliper brake levers designed specifically for flat handlebarsaluminium lever and bracket keep weight low while a tough finish keeps the bike looking good clamp diameter 22 2mm weight 175g per paira 2 year warranty is offered with all shimano products from chain reaction cycles 3 years o