road STI and MTB derailers—Compatable?
I am helping a friend adding STI 8 speed to his old bike. I can get 8 speed RSX STI and wondered what derailers I can mate it to. I looked at the prices of rear and front derailers and noticed mtb. equipment prices are much lower. Could I mate the shifters to a deore 8/9 speed rear derailer sold on Nashbar http://www.nashbar.com/profile.cfm?c...t%3A%20Rear%20
What about the front? Anyone have an idea. He is not looking for the cutting edge or super high performance. I have a chain casette and rear wheel for 8 speed he can use. |
Rear derailleurs will work fine but the front MTB derailleur does not operate at the same cable pull ratio as the Road STI shifter. Try picking up a SORA front 8 speed derailleur, they are inexpensive and will do the job.
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Originally Posted by simonchini
(Post 5214295)
I am helping a friend adding STI 8 speed to his old bike. I can get 8 speed RSX STI and wondered what derailers I can mate it to. I looked at the prices of rear and front derailers and noticed mtb. equipment prices are much lower. Could I mate the shifters to a deore 8/9 speed rear derailer sold on Nashbar http://www.nashbar.com/profile.cfm?c...t%3A%20Rear%20
What about the front? Anyone have an idea. He is not looking for the cutting edge or super high performance. I have a chain casette and rear wheel for 8 speed he can use. If you have a triple in front, that turns into a can of worms. See: http://sheldonbrown.com/front-derailers Sheldon "Doubles Are Easy" Brown |
Thanks for the replies.
Seldon, I love your website, lots of great info. |
absolutely
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bump of sorts. I'm also putting RSX STI's onto my trek 3x7 speed. though i have Deore cranks and deraillers.. will that work or will i also have to get the Sora front derailler to shift right?
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Originally Posted by Jakedatc
(Post 5651983)
bump of sorts. I'm also putting RSX STI's onto my trek 3x7 speed. though i have Deore cranks and deraillers.. will that work or will i also have to get the Sora front derailler to shift right?
And the shifters must match the number of cassette cogs. Al |
An MTB crank will work ok with a road fd even though the cage curvature isn't ideal. In the past Trek equipped some of their road bikes with 7-speed RSX which came with 46/36 double or 46/36/26 triple cranks and they also used RX-100 road fd's intended for 53/39 or 52/42/30 chainrings. They shifted just fine.
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maybe mine is a mish mash of things someone put together.. it's 50/44/28 hopefully things will work.. or i just make it work mostly for the middle and big gear and call it good enough for now. got the bike cheap and am not really looking to put much $ into it.. so we'll see how it goes
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