Joined: Jul 2007
Posts: 8,611
Likes: 3,535
From: South shore, L.I., NY
Bikes: Trek Emonda SL7, Cannondale Topstone, Miyata City Liner, Specialized Chisel, Specialized Epic Evo
You need a thicker shim. 2 of my bikes have similar mounts (Garmin, but functionally identical) on 25.4mm width bars and stay put.