13-26 is aimed at the 'Sportive' events with hills as a 39/26 bottom gear should see somebody with good fitness over most hills. A race or 'tight' block is 11-21 so geared higher for flat/downhill speed.
13-26 is aimed at the 'Sportive' events with hills as a 39/26 bottom gear should see somebody with good fitness over most hills. A race or 'tight' block is 11-21 so geared higher for flat/downhill speed.