Q for technocrats

[ozboz]

Hi , I have just had a 10 speed 11-36 cassette fitted to back wheel , so I need to have a longer chain , Ive worked it out by numbers ;

Length of chain stay. 15.75 x 2. 31.5
Teeth on large CR. 52. /4. 13
RC large ring. 36. /4. 9
+ 1. 54.5
So chain should be 54.5’’.

I don’t want to fit new chain if it’s wrong length

Any one see a problem here ?

 

[Cycleops]

That's the mathematical method. You can cross check by using the physical calculation, big cog to big cog omitting the RD plus two links I think, or is it one?

 

[ianrauk]

That's the mathematical method. You can cross check by using the physical calculation, big cog to big cog omitting the RD plus two links I think, or is it one?

I use the 2 method (1 Link pair)

 

[ianrauk]

 

[raleighnut]

^^^^^^^ same for me.

 

[bpsmith]

As above. Works for me every time and very easy to do.

 

[mjr]

And what's more, it still works if your bike shrinks because you ride it in rain!

 

[Smokin Joe]

http://www.machinehead-software.co.uk/bike/chain_length/chainlengthcalc.html

 

[pawl]

That's the mathematical method. You can cross check by using the physical calculation, big cog to big cog omitting the RD plus two links I think, or is it one?

One if using a master link

 

[ozboz]

Hi all ,
Well , all went well !
Judging by the gap between the jockey and 36 cog the Wolfs tooth has done its jo b well , I’ll be looking at getting my Surly upgraded also now ,
I went with the numerical method , as a person who has Dyscalculia numbers are my Achilles heel , but with a tape and calculator , easy peasy !! even for me !!
I did check it out with the app @Smokin Joe posted , there was a 1/2’’ difference , but that was sorted ,