G'day,

In the process of rebuilding my MC21 SP rear shock and would like to put the "R" model spring in.

Does anybody have one they'd be willing to part with?

If it's a complete shock i'm happy to buy the lot for the right price.

Does anyone know what the difference in the spring lengths are?

I found the free length of the "R" spring at 131.3mm (128.7mm service limit) but i can't access the SP section of the manual to find it's free length and service limit.

I think i'm going to have to upgrade my account.

Spring no longer needed, after stripping the shock today, it's free length is 170mm, i guess somebody beat me to it.