The park tool ts 2ext2 truing stand upright extensions install in seconds on any ts 2 or ts 22 truing stand allowing the stand to be used on wheels with hubs up to 200mm wide tandem fat and downhill bikes as well as on wheels with a 29 mountain bike tire installed in addition specially sized bosses on the ts 2ext2 serve as adaptors so the ts 2 truing stand can be used with wheels using 12mm 15mm 20mm or 25mm thru axle hubs with removable axles park tool ts 2ext2 truing stan