Joined: Sep 2015
Posts: 340
Likes: 72
From: Denver Colorado
Bikes: 2020 Pivot Vault, 1983 Rossin Record, Garneau R1, Mesamods home built gravel/rain commuter bike, 1995 Barracuda A2V modified with Surley single speed dropouts, 1969 Bottecchia junkyard special fixed gear, Cervelo P4, Mesamods 650b klunker
Depending on the bottom bracket type, my guess would be either the lock nut ( 1 piece crank) or lockring (square taper 3 piece crank) are not locked down causing the bottom bracket to "tighten up" the adjustment setting when rotated backwards.