General => Douglas Motorcycles - General Discussion => Topic started by: tck on 21 Mar 2021 at 15:57

Title: MK rear chain
Post by: tck on 21 Mar 2021 at 15:57
Some chain that came with my mongrel Douglas looked correct, was not excessively worn and fits on a short run of sprocket front or back. But when wrapped around the rear sprocket for half the circumference it started to rise up above the teeth  Nominally 1/2 pitch  the width? of the standard chain is stated to be .305" ( I am unsure where that measurement is made) The chain that rode up had a pitch of around .485" and an inner link with is about the same at 485".  interestingly I found a length of chain that does seem to fit and it has a pitch of .448" and a inner chain link width is again the same at .448  but I cant see a .305" dimension anywhere...
Title: Re: MK rear chain
Post by: Dads bike on 21 Mar 2021 at 16:20
I am no expert on chains but this guy is and is more than happy to give advice.
Jason 01299 212626

All the best
Title: Re: MK rear chain
Post by: eddie on 21 Mar 2021 at 20:15
       The standard size chain for the Mark series is 1/2"pitch x 5/16" wide. The .305" figure is the thickness of the sprocket for that size of chain.
  The chain you have with the .485" pitch is probably some worn 12mm(.472") pitch metric chain.