Park Tool's 238K Caliper Upgrade Kit will upgrade the TS-2 Professional Truing Stand to accept wider wheels and tires to increase the versatility of your TS-2 truiing stand. The set includes left and right caliper fingers, and one pair of the plastic removable tips. NOTE: The 238K will not allow the wide 29er wheels with plus-sized tires to be trued in the older TS-2 stands. Use the upright extensions TS-2EXT.2 to for truing 29er wheels with plus-sized tires.