so I have a stumpy from 2011 that I recently got my hands on, now I had an issue with the cranks and got a set from a nice person on here. I have fitted them and all is well but I think my chain seems too long?
When on the small cog front and rear it looks like the mech is as far back as poss but that there is still a lot of slack. Is there a way to work out how many links my chain should have? and if this one has just stretched or if the changing of the cranks has upset things?

Is there a way to work out how many links my chain should have?

Chain on big cog, big chainring; add 2 inches (2 inner links and 2 outer links).

How many teeth on new cranks as opposed to old?

But…

Small ring front and back is a no,no mate. Same as big front big back.

Small – small WILL will make chain slack and the mech be full on back.

Turn bike upside down, cycle chain to smallest cog/chain ring . chain should just run clear of the jockey wheels. If it runs on top of jockey wheels it is too long

wonderful! appreciate that!
Is it massively a problem for short to short? normally when I’m clumsy and climbing

Chain on big cog, big chainring; add 2 inches (2 inner links and 2 outer links).
sorry being thick…. can you make that more idiot proof?

Hi mate,
YouTube will make the expansion much clearer. Lots of guides on there but… chain length might be fine. Have you changed the gearing ratio by changing to larger/smaller chain rings?

If it’s a full suss, let the air out of the shock and compress it, then do as JoeG said. Remember to add the 2 full links without it running through the rear mech.

oh ok that makes more sense…. so I run cog to cog and ignore mech and then run it through the mech with the 2″ on. thank you.
was being stupid for a moment there.
why do I need to let all the air of of the shock out of interest?

There is likely to be a bit of chain growth in the compressed position so you are measuring for the longest position.