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Upgrading components on 1990 vintage Shimano sport group(4 posts)

Upgrading components on 1990 vintage Shimano sport groupakjohn
Apr 13, 2002 9:35 AM
I would like to upgrade/update a few components on a 1990 Centurion bike. The bike currently has Exage sport components with bio-pace chainrings. The bike has a hyperglide 7 speed cassette, index shifting with downtube shifters. The lugged Tange tubing frame is in great shape. I plan to use the bike as a commuter to reduce wear and tear on my new Look.
I would like to pitch those lame bio-pace chain rings for rings that are actually round:-) and the rear derailer could use replacing. Also, I would like to replace the stem.

Can anyone offer advice on compatible bargain components?


re: Upgrading components on 1990 vintage Shimano sport groupfrank_freedom
Apr 15, 2002 2:39 AM

if you wish to upgrade to a 8,9 or 10 speed gruppo watch out to see if your rear triangle is wide enough to accept a wider cassette. Wanted to upgrade the gruppo on my 1992 bike and the rear was not wide enough, had to have it streched.

Apr 15, 2002 3:10 PM
you have a freewheel, not a cassette, so you won't likely be 'upgrading' to 8 or 9 speeds without a whole new wheel, probable spreading of frame, and no guarantee you won't have chainline problems. Be happy with the 7 speed (it's plenty of gears for any purpose short of racing) and if you need a real low gear for commuting, Shimano makes a Megarange freewheel with a huge 34-tooth cog. You'll need a new RD for that (you say you want one anyway) so I'd say Deore (or any MTB RD). Rivendell has some real sharp quill stems that would look great on your bike. Those Centurions are nice; don't try to make it something it isn't.

I agree on losing the biopace though.
Thanks for the input...akjohn
Apr 16, 2002 8:14 PM
I agree that 7 speeds is just fine. I think I have a 13-23. I don't see the need to go to 9. I also agree that Centurions are good old bikes. My components are just worn out and need replacing.