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my son up in Newcastle is trying to convert his bike to singlespeed.
sounds simple enough.
chain is a new SRAM PC1051
cog & spacers are from PlanetX - & says - works with 3/32 or 1/8in chain
having put the chain on the bike it looks like the pitch of either the chain or the cog are incorrect.
see attached photo - also here https://photos.app.goo.gl/HXoCIFT9I9cIt0qF2
unfortunately he does not have the old chain or cassette to compare as I swapped them a few weeks ago.
Hé has a 10 speed chain. Maybe need 8 or 9 speed.
May not be the issue but I think a 10 speed chain is too narrow.
I always use 8 speed chains.
but as I said the cog is compatible with both 3/32 or 1/8in chain
& as far as I can tell the issue appears to be pitch & as far as I know the pitch of of 8, 9, 10 & 11 speed chains are the same.
Again may not be the issue but I had a Gusset SS sprocket that had teeth that fouled on the chain as they were too long. A quick file sorted that.
Bicycle chain pitch is 1/2". There are some very rare exceptions to this but you're not going to stumble across them by accident.
The measurements you've given, 1/8" & 3/32" are not specifications but names really. 1/8" being single speed chain and 3/32" being for multiple gear systems.
As more cogs are added at the back, the chain gets narrower but the name has remained.
Try a wider chain.
thanks all.
an 8 speed chain costs naff all - even for a student - so I might as well send him off to try that.