- Original Reverse S-Trail stem made to fit oversize steer tubes for Cannondale bikes. Fits both 1.56" (Headshok and older Lefty size) as well as newer 1.5" steer tubes with included reducer shim. -CNC machined 6061-T6 aluminum - Weight is 172 grams - 31.8mm handlebar clamp - 60mm length - 8 degree rise - Steer tube clamp height 40mm. You may need additional 1.5" or 1.56" spacers to match the height of your old stem. - This is the only stem option on the market since Cannondale discontinued their Headshok and 1.5" stems.