I am trying to service my bike but am having a bit of a problem, and would appreciate any help you can give.
I run a 1970/80s frame with a Stronglight double front chainring. The teeth on this are badly worn but I managed to pick up a set of replacement old stock rings.
I managed to remove the outer ring with no problem, as this just needed a 5mm alen key to remove the bolts. The inner ring however seems to be held by a different method, the 'bolt' for this is hollow (it is what the front ring bolts screw into from the other side) and the only releif on it is two small slots at opposite sides - so looks like a drilled out screw - but this is wider than any screwdriver I have, and there is not much metal to get any leverage on even if I had one.
Does anyone know how these should be removed? Is there a good technique for doing it, or is there a special tool that I can buy?
I am hoping to get these rings changed over soon, as my chain is now looking very poor, and although I have a replacement ready I really did not want to put a new chain on with old rings.
Neil
I run a 1970/80s frame with a Stronglight double front chainring. The teeth on this are badly worn but I managed to pick up a set of replacement old stock rings.
I managed to remove the outer ring with no problem, as this just needed a 5mm alen key to remove the bolts. The inner ring however seems to be held by a different method, the 'bolt' for this is hollow (it is what the front ring bolts screw into from the other side) and the only releif on it is two small slots at opposite sides - so looks like a drilled out screw - but this is wider than any screwdriver I have, and there is not much metal to get any leverage on even if I had one.
Does anyone know how these should be removed? Is there a good technique for doing it, or is there a special tool that I can buy?
I am hoping to get these rings changed over soon, as my chain is now looking very poor, and although I have a replacement ready I really did not want to put a new chain on with old rings.
Neil