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Old 10-19-10, 02:36 PM   #1
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What derailleur for 8 speed XTR shifter?

As far as I know I can use shimano 8 or 9 speed ones, but will anything else work? I have a few suntour derailleurs sitting here. If they won't work, would shelling out for an XTR derailleur (~50 used) be worth it over an XT derailleur (25-30 used)?
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Old 10-19-10, 02:39 PM   #2
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Any modern 7,8,9, 10 RDs will work. RDs are not very smart units. They just control the movement of the chain at the command from the shifters. The # speeds depends on the shifter and cassette.

Which mazdaspeed you got?
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Old 10-19-10, 03:57 PM   #3
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mazdaspeed, Any of the Shimano 8/9S LX, XT, XTR and maybe STX-RC will work. You'll have to experiment with the Suntour. While RDs aren't smart, they do have different pull ratios.

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Old 10-19-10, 04:10 PM   #4
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Exage Country, Exage 300, 400 and 500LX, Alivio, Acera X, 100GS, 200GS, STX, Deore, Deore DX, Deore LX, SLX, STX, STX RC, SIS, XT, XTR, 2200, Sora, Tiagra, RSX, RX100, 105, Ultegra, 600 Ultegra, 600, Dura Ace 9 speed will all work. There may be more. I have been told 10 speed derailleur sometimes do not fit some 8 speed chains.

Basically any shimano derailleur designed for indexed shifting except pre-9 speed Dura Ace.

The only ones I am not sure about are the new Dyna Sys... I thought someone told me these 10 speed MTB derailleurs would not be compatible with old MTB shifters... could just be that 10 speed derailleurs sometimes don't work well with 6-7-8 speed chains.
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Old 10-19-10, 09:45 PM   #5
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You'll need a rear derailer with enough range to cover the entire 8speed cassette, and it'll need to have a 2:1 ratio. Basically, most all the SRAM derailers are out of the question, but most 7, 8, or 9 speed shimano and sun derailers should work just fine. You might have some trouble in terms of chainwrap capacity and max cogs, depending on your crank and cassette, so choose a rd according to those factors. Also, XT derailers are very nice, and if you're looking at used derailers to save a few bucks, you probably aren't the type who'll "need" to spring for the used xtr.

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Old 10-20-10, 01:58 PM   #6
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Any 8 or 9 speed long cage Shimano mountain rear derailleur will work. Depending on your particular crankset and cassette some of the other Shimano derailleurs may or may not work. Surreal's post above is correct, some of the others are not.
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