Spin Doctor Front adaptor cones to convert the front hub between 9mm QR, 15mm and 20mm.
Note: There are 2 types of 20mm cones
Mk1 (earlier hubs) have offset bearings with 2 different sized spacers: Disc Side: 28mm & Non-Disc side: 18mm
Mk2 (later – mid 2006 onwards) are more equally spaced. Disc side: 16mm deep, Non-Disc side: 18mm deep.