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Can Shimano RD M-410 be used as an 8 speed?

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Can Shimano RD M-410 be used as an 8 speed?

Old 07-20-20, 02:35 PM
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uklaird
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Can Shimano RD M-510 be used as an 8 speed?

I recently acquired a 2002 TREK 7500 FX with all the correct equipment ie Nexave crank & FD, Alivio 3x8 trigger shifters, & Deore RD M-510.
It's blue/silver paint denotes it's a 2002.
Anyone know why it would come with a 9-speed RD, & can it double as an 8-speed - as to my knowledge the increment changes of an 8-speed shifter would not be compatible.
I'm about to re-install it, as I've had the whole bike stripped down since I acquired it - so I guess I'll find out shortly.

Last edited by uklaird; 07-20-20 at 02:39 PM. Reason: manufacture date error
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Old 07-20-20, 02:50 PM
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dedhed
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Either the M410 or M510 will work and index just fine on your 8 speed cassette and shifters. Slight, and I mean slight, chance the cage is narrower and will require a 9 speed chain, but usually not an issue.

Condition being equal the 510 is the better unit.

Maybe a RD was damaged & replaced, maybe an upgrade, maybe just what was available,.
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Old 07-20-20, 06:04 PM
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Bill Kapaun
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Originally Posted by uklaird View Post
I recently acquired a 2002 TREK 7500 FX with all the correct equipment ie Nexave crank & FD, Alivio 3x8 trigger shifters, & Deore RD M-510.
It's blue/silver paint denotes it's a 2002.
Anyone know why it would come with a 9-speed RD, & can it double as an 8-speed - as to my knowledge the increment changes of an 8-speed shifter would not be compatible.
I'm about to re-install it, as I've had the whole bike stripped down since I acquired it - so I guess I'll find out shortly.
It would work for 7 & 8 & 9 and "some?" 10.
Might be more prone to chain rub as you use the wider chains from the lower "speeds".
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