Went on my first proper two day gravel ride a few weeks ago. On day one there was a lot of corrugation on the downhills and climbs. I double checked all the bolts and nuts on the day before the ride and torqued all to specs. Day one the hanger worn out where the B-Bolt stopper of the derailleur go. The derailleur picked up and luckily did not go into the spokes. Managed to get the derailleur back in the right position and got back to the car on day two with the derailleur only picking up once. Bought two new hangers from TWT and fitted a new hanger with the exact same problem. The hanger/frame was checked with a derailleur hanger alignment tool and nothing was out of alignment. We then fitted a brand new GX Eagle derailleur to see if it is a problem with the original Apex derailleur. Problem exactly the same. My bicycle is still under warranty and TWT did not even offer to replace the broken drop out. Eventually got a phone call from TWT yesterday after i told them i'm going on the hub to inform other GP300 owners of the problem. I have got photos of another GP300 that was bought three months ago with the exact same problem on the hanger. I would recommend that if you got a Momsen GP 300 and going on a bikepacking tour to take a few hangers with. There is not enough "meat" on the hanger where the derailleur touches. Would like to hear if any other Gp 300 owners had the same problem? Do you think it is a hanger design problem or SRAM derailleurs is not 100 % compatible with the hanger? Will fit a Shimano derailleur this weekend to see if it fits better than SRAM.
