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Old 01-14-08, 01:32 PM   #1
gpshay
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changing from 7spd to 9spd

I currently have a Cannondale T-1000 purchased new in 1993 it has been housed the entire time waiting for me to retire and start some touring. Well the time has arrived I will be retiring in approximately 10 months so the planning and purchasing of gear has begun. The Cannondale has a 7 spd Shimano cassette on the back and I'm seriously thinking about purchasing a 9 spd cassette form Harris Cyclery "cyclotouriste 14" I'm thinking I will also need to replace the bar-end shifters that are on the bike now to the Shimano 9spd index/friction bar-ends and maybe a new chain. Any input would be appreciated to this Newbie..thanks Glenn in phx
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Old 01-14-08, 01:52 PM   #2
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This question has lots of info on the C&V and Mechanics subforums.

Your first issue will be spreading that aluminum frame from 126 to 130mm.

Or you can run 8of9 on a 7s freehub.

Post (or search) in those 2 other subforums
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Old 01-14-08, 04:33 PM   #3
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I'd be reluctant to spread those dropouts, but that may just be my natural distrust of alumuminum--I don't KNOW that it would cause trouble. I've spread steel frames from 126 to 130 a couple of times with no trouble.
There's no need to change shifters unless you can't use a friction setup. My two main road bikes, an Atlantis and Rambouillet, both use barcons in friction mode (8 spd on the Atlantis, 9 on the Rambo) and shift fine. Indexing is overvalued, IMO--I'm not anti, but for everyday riding, the advantages are tiny if they exist at all.
If you switch, you will need a new chain, though. I'm almost certain the 7sp chain is wider and won't work. SRAM chains are modestly priced and work great on my bike, plus you don't have to screw around with that Shimano pin.
Others may disagree, but at least for me, this swap wouldn't be worth the cost. Until recently I had a 7-speed Allez, too, and it didn't give up much compared to the eight and nine on my other bikes. But your choice, of course.
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Old 01-14-08, 05:11 PM   #4
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Never ever spread aluminum or carbon. They'll be significantly weaker if it survives the ordeal.
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Old 01-14-08, 05:42 PM   #5
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Quote:
Originally Posted by Bob Barker View Post
Your first issue will be spreading that aluminum frame from 126 to 130mm.
Might not need to. Measure your rear dropouts inside-edge to inside-edge. My 7-speed Bridgestone, from about the same era, was 130mm.
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Old 01-14-08, 08:57 PM   #6
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I went to the cannondale vintage site and what i'm reading the dropouts may already be at 135 I'll have to pull the rear wheel and measure. if not then i will not spread the alluminum frame i will take your advise thanks again glenn in phx
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