Activity Idris Thomas replied to the topic 50/34 – 12/25 or 53/39 – 11/28? in the forum General Discussion 11 years, 9 months ago http://www.gear-calculator.com/#KB=34,50&RZ=11,12,13,14,15,17,19,22,25,28&TF=85&UF=2099&SL=2