I changed the rear cog on my bike the other day to a slightly larger one for the hills of my commute. I’ve noticed now there is some slight play in the cranks i.e. there is some free back and forth movement of the cranks before the chain is engaged. Any idea what this is/ how to fix it?
I thought it might be a chain tension issue, but the chain is pretty tight. Could it be the tooth width of the new cog is narrower than before?
The bike is otherwise quiet, the chain feels secure on the cogs and once the cranks are moving the play is not really noticeable, just when at standstill/ going very slow.
I need some other gear so I’ll drop into the cycle shop tomorrow and ask their advice. I don’t really think it’s a loose rear sprocket as I tightened that up pretty well, but I’ve been wrong before!!! I’ll have a look at the chain tension again tonight.
Just had another look. I’ve previously trashed my track nuts by using the wrong spanner, therefore I can’t tighten them as much as I would like. The rear hub has consequently shifted forward on the fork ends (dropouts) and the chain is now waaay loose. So that’s where the play is coming from. Ooops. New nuts tomorrow.