Sleeve Block Hitch for Adams Trail-A-Bikes 1999 and newerIncludes set of 3 plastic sizing shims for different seatposts.If your Trail-A-Bike dates from 1999 or later (15 mm block with horizontal locking pin)If your Trail-A-Bike dates from 1998 (15 mm block with vertical locking pin) you will also need the 1st knuckle15 mm conversion.If your Trail-A-Bike dates from 1997 or earlier (12 mm block) you will need both of the items above, and also the 15 mm-12 mm step-down block.
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