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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 07-19-10, 10:26 PM   #1
Virginian
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Question on changing rear derailleur

Obviously, this is my first post. So, quick intro...petite 6' 1" 290 clyde just getting back into biking to do the obvious-get in better shape and lose weight. Got a good deal on a GT Transeo Disc 2.0 because it had a busted rear derailleur. Don't know how it broke, maybe in shipping, but it is a non-starter.

Seeing as how I am not the strongest yet, I have a 9-speed cassette (got from a buddy-Shimano XT 11-34) that I was thinking of replacing the 8-speed 11-32 currently on the bike along with a new Shimano SLX RD-M662 derailleur. Or should I just replace the derailleur with the SLX and leave the 8-speed alone?

Thoughts and insight are appreciated....been lurking for a while and have learned much and received much inspiration from this bunch.
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Old 07-19-10, 11:09 PM   #2
zoste
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Nice bike!

I believe that the shifters on your handlebars are indexed on that bike, though. In order to switch from 8 speed to 9 speed I think that you'd need new shifters in addition to the new cassette and new derailleur.

I could be wrong...there are plenty of folks on here more knowledgeable than I am.

Oh, yeh...welcome to the forum, and to the obsession.
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Old 07-19-10, 11:15 PM   #3
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In order to switch from 8 speed to 9 speed I think that you'd need new shifters in addition to the new cassette and new derailleur.
Agree. Almost all modern rear shifters are indexed these days. That means that an X-speed rear derailleur needs to be paired with an X-speed shifter, an X-speed cassette and (possibly) an X-speed chain.

Not a huge amount of difference between an 11-32 and an 11-34 cassette. Why not replace the derailleur, ride the bike for a while, and see how it goes?
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