Original Cannondale Si and Hollowgram road crank spider with 120/90mm BCD for that low low gearing.Starting in model year 2018, Cannondale began using this new BCD for compact and sub-compact cranksets on road and cyclocross bikes. Use with chainrings with 120/90 BCD from FSA.Go as small as a 30t inner ring and 46t on the outer ring with this spider.
