Hi all,
My chain ring has started to rub on the frame of my bike (see photo). I suspect the problem is a worn bottom bracket but can't feel any roughness or stiffness when I turn the cranks by hand. There seems to be a small amount of play in the bottom bracket but it doesn't seem to be excessive (but I'm not sure what is excessive). Does anyone have advice on how I can check whether it is the BB or a bent chain ring.
The chain ring is a shimano biopace which is why the area of rubbing extends beyond the visible portion of the inner chain ring.
The rubing is not constant but seems to come and go.
Thanks
AB
My chain ring has started to rub on the frame of my bike (see photo). I suspect the problem is a worn bottom bracket but can't feel any roughness or stiffness when I turn the cranks by hand. There seems to be a small amount of play in the bottom bracket but it doesn't seem to be excessive (but I'm not sure what is excessive). Does anyone have advice on how I can check whether it is the BB or a bent chain ring.
The chain ring is a shimano biopace which is why the area of rubbing extends beyond the visible portion of the inner chain ring.
The rubing is not constant but seems to come and go.
Thanks
AB