Pirelli Angel SmarTube X Tube - 700 x 28 - 42mm 42mm Presta Valve ModelNumber=D1539 These rings are for use

These rings are for use with Shimano 110 BCD Asymmetric 4-bolt cranks

Tooled reach adjustment and bite point adjustment for customized feel to each rider

Composition: main fabric: polyester 40%

UHM Carbon Shaft

Pirelli Angel SmarTube X Tube - 700 x 28 - 42mm 42mm Presta Valve ModelNumber=D1539 These rings are for use70% weight savings compared to conventional tubes 50% smaller than conventional tubes 3x thicker than standard SmarTUBES Not for use with rim brakes Not designed to be repaired Constructed of Thermoplastic Polyurethane TECH SPECS Valve Length 42mm Shaft Type Non threaded Tube Width 28 42C Valve Presta Wheel Diameter 700C Tube Weight 145g