Spudalumps
Senior Retro Guru
Knocking sounds can vibrate through the frame making them very hard to pinpoint. I am curious of a few things to try if and when you're off the bike and have the drivetrain in the lowest gear:
- Wiggle the crankarm is there any lateral play (perhaps it has worked loose from the bottom bracket)
- Is the chain compatible with this drivetrain (the higher gears may be applying more pressure onto the chain and chain rings stopping any slipping
- when in the lowest gear look down the chain and see if there is a good and straight chainline similar to above
- what is the condition of the bottom bracket sometimes square taper arms cause all sorts of weird and wonderful issues
As before the teeth look fine to me I don't think its anything to do with that
- Wiggle the crankarm is there any lateral play (perhaps it has worked loose from the bottom bracket)
- Is the chain compatible with this drivetrain (the higher gears may be applying more pressure onto the chain and chain rings stopping any slipping
- when in the lowest gear look down the chain and see if there is a good and straight chainline similar to above
- what is the condition of the bottom bracket sometimes square taper arms cause all sorts of weird and wonderful issues
As before the teeth look fine to me I don't think its anything to do with that