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8 spd to 9 spd new der.

Old 05-07-05, 03:52 AM
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8 spd to 9 spd new der.

I just read in the raod bike forum that you do not need a new deraller if converting from 8 speed to 9 speed.how true is this?
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Old 05-07-05, 06:27 AM
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Originally Posted by bigchris603
I just read in the raod bike forum that you do not need a new deraller if converting from 8 speed to 9 speed.how true is this?
That's true. But let's also asssume you are talking shimano and the 8 speed RD is not Dura Ace.And also that the 8 speed unit is not wore out or sloppy.

Last edited by sydney; 05-07-05 at 06:41 AM.
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Old 05-07-05, 07:53 AM
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Originally Posted by bigchris603
I just read in the raod bike forum that you do not need a new deraller if converting from 8 speed to 9 speed.how true is this?
Think about it a little. The rear derailleur guides the chain from the middle so it doesn't care.

The front derailleur guides the chain from the sides. 9-speed front derailleurs are a tiny bit narrower than 8-speed. I'm told the difference isn't a problem for double chainring conversions but I've found it necessary to use a 9-speed front derailleur when converting a triple.
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Old 05-07-05, 04:25 PM
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Originally Posted by bigchris603
I just read in the raod bike forum that you do not need a new deraller if converting from 8 speed to 9 speed.how true is this?
You thought I was lying to to Bryan?
https://www.bikeforums.net/road-cycling/105189-can-i-use-my-old-rear-mech-9-speed.html
Give me a break.
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Old 05-07-05, 04:37 PM
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Originally Posted by Raiyn
You thought I was lying to to Bryan?
https://www.bikeforums.net/showthread.php?t=105189
Give me a break.
< sydney could insert very sarcastic comment here>
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Old 05-07-05, 08:40 PM
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no, i was just trying to get info from more than one source. my thought was that a 9 speed chain may not run thru the pullys properly, being that it is a hair smaller.

I did not mean to offend anybody just wanted a second opinion.
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Old 05-07-05, 11:15 PM
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Originally Posted by bigchris603
no, i was just trying to get info from more than one source. my thought was that a 9 speed chain may not run thru the pullys properly, being that it is a hair smaller.
Take a good look at your pulleys.
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