The ROTOR Gravel Spider BCD110/80 x 4 New Spider from Rotor that allows you to give your gravel bike a nice upgrade. The spider has a fit of 110BCD for the outer chainring and 80BCD for the inner chainring. The small BCD of 80 now allows you to use a 30 or 31 tooth chainring as well. ROTOR Gravel Spider Part Number: Matte: C02-972-99010-0 Glossy: C02-138-00020-0
