8 who for 9 what?
OK, I hope there is a simple answer for this question.
I still have 8 speed drive train, mostly shimano STX-RC. In trying to lighten the load Ive bought new cranks and BB, Race Face Prodigy XC, and SRX. I checked with the LBS when I bought them, and they assure me that there is no problem using 9 speed front chainrings with 8 speed chain / rear cassette. However, Race Face's website makes some claim of incompatability. Ok who's blowin smoke up you know where....? |
It's CYA. But, if you worry about it use a 9 speed chain.
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7, 8, and 9 speed chains are all the same inside width 3/32". The outer width narrows. The suggestion to use a 9sp chain is a good one if you experience any difficulty. Spacing of chainrings is less critical than rear cog spacing. For practical purposes there is little difference between "8-speed compatible" and "9-speed compatible". I am using 9sp STI shifters with older 6 or 7 sp cranks on two of my road bikes..
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Contrary to what pokey said.
I'd suggest sticking with an 8 - speed chain. If you swapped out the cranks (i.e. 3 front chainrings) and kept the 8 speed cassette, you need to stick w/ an 8 speed chain. The 9 speed chain is thinner and will not work well with an 8 speed cassette. An 8 speed chain (wider) will work with 9 speed chainrings. But will NOT work with a 9 speed cassette. I ran Shimano XT 8 speed with Race Face LP Turbine cranks and 9 speed rings w/o a problem. BTW what is SRX********** I may be completely off base since I don't know what SRX is, so, if I am sorry Pokey! L8R |
As i rethink it, his 8 speed STX deivetrain may be IG, which shimano says requires an 8 speed IG chain which has a width of 7.1mm which is narrower than the HG width of 7.4mm. Sram says their chains work with IG cassettes ,and the 9 sped is 6.9mm vs shimanos 9 speed width of 6.6mm.what's it all mean.I duno.
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Sory a2,
SRX is the type of bottom bracket, the new one... just so there is no confusion. But I am using a SRAM chain, 8 sp, pc 68? damn if I dont forget!! Thanks, I think that Race face probobly are just covering any angle... It going on tomorrow... :D Next week, I ride like hell!! :lol: |
Originally posted by Scooby Snax But I am using a SRAM chain, 8 sp, pc 68? damn if I dont forget!! Next week, I ride like hell!! :lol: FWIW, I called SRAM to ask about the difference between the different chain models when they came out with the PC-99 "racing" model. I don't race, but if it were functionally better in some way I would have been willing to pay a little extra for it. The SRAM tech said there is no functional difference between the different numbered models, just cosmetic and weight differences. PC-59 - has alternating black and silver links PC-69 - all silver PC-89 - does have heavier plate construction for heavy duty off-road use PC-99 - has drilled plates for slight weight reduction But the rolling/moving parts are basically identical. |
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