Bicycle Mechanics - Question on rear derailleur/front shifter compatibility.

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coolio
09-01-10, 09:35 PM
Hi,
Wanted to see if I could install this trigger shifter:

http://www.rei.com/product/793371?preferredSku=7933710019&cm_mmc=cse_froogle-_-datafeed-_-product-_-7933710019&mr:trackingCode=79A3071B-81F9-DE11-BAE3-0019B9C043EB&mr:referralID=NA&siteId=cjIsd2x-it3792&URL=http%3A%2F%2Fwww.rei.com%2Fproduct%2F793371%3FpreferredSku%3D7933710019%26cm_mmc%3Dcse_froogle-_-datafeed-_-product-_-7933710019%26mr%3AtrackingCode%3D79A3071B-81F9-DE11-BAE3-0019B9C043EB%26mr%3AreferralID%3DNA&PID=3641099&AID=10456937&cm_mmc=CJ-_-Aff-_-3641099-_-10456937

on my bike which has this rear unit:

http://store.icyclesusa.com/sunrace-m90-juju-9-speed-rear-derailleur-p27021.aspx

I googled this sunrace m90 and found this:

http://www.disraeligears.co.uk/Site/SunRace_Juju_M90_Magnesium_derailleur.html

There is no word on actuation ratio, which I understand has to match up. Anybody ever work on this?

Chris_W
09-02-10, 12:16 AM
That Sunrace RD is probably compatible with Shimano shifters and SRAM "Attack" shifters, but not the SRAM X.7 that you linked to.
coolio
09-02-10, 07:24 AM
Thanks, Chris W. I did some further digging and found this rear derailleur on the sunrace website:

http://www.sunrace.com/en/products/detail/m90?sku=RDM90

Although my rear unit says "Juju" on it, I think it's virtually the same. Probably a more recent year model. It confirms the 2:1 ratio that is compatible with the Attack shifters. Thanks, again.