The Lefty boot is not optional and ought to be replaced if there are any cracks, cuts, or tears on it. Cannondale makes two sizes, Lefty Speed and Lefty Max.
- Leftys with 26″ wheels with 110mm travel or less use the Speed boot QC678
- Leftys with 26″ wheels and 120mm+ travel and ALL 29″ use the Max boot KF222
The Lefty Air Filter is the same on all Lefty forks and is also required, part number HD209/BLK.Search for lefty boot on CannondaleExperts.com