stumpyjoe

I have a shimano xtr rd-m952 rear derailleur, and need to fix the jockey wheels. They are about $30 each. There are new derailleurs to be had on ebay for about $80 or so. I am wondering which ones are compatible with my setup.

2000 stumpjumper fsr comp
xtr front and rear derailleurs
xtr cranks


The other option is to fully rebuild this one, maybe with a new spring etc. How difficult is it to replace the spring?

kenhill3

All newer (last dozen years or so) Shimano MTB derailleurs are interchangeable. Just be certain that the cage length is the same.

Wordbiker

Also be sure to match Rapid-rise (low-normal) with Rapid-rise...or you can take the opportunity to fix it and go to high-normal.

kenhill3

Thanks. I forgot about the silly Rapid Rise thing. Never used one.

merckx_rider

factor in your time and all the parts costs and the new one might not be such a bad deal.

kenhill3

One of the best deals out there for MTB rear derailleurs, Shimano Deore, $22 :

https://www.cambriabike.com/shopexd.asp?ID=33426

stumpyjoe

how can you tell a rapid rise system? Is it the pattern on the chainrings?

I know I have a long cage based on pictures I have seen: https://www.jensonusa.com/help_desk/t...derailleur.asp

Thanks for all the input.

operator

Rapid rise will say it on the derailleur. If you disconnect the cable the derailleur should automagically align itself on the biggest rear cog if it was rapid rise. Smallest if it's normal.

Factor in the condition of the rest of the derailleur before you spend $30/pulley.

tellyho

+1 on the basic Deore derailleur. A solid buy. You can't convince me to pay $80 for a derailleur - that's more than half of my bikes cost.

kenhill3

Oh, come on, don't be so cheap. You could have this one for only $1200 .