Classic & Vintage - Shimano 600 experts: Upgrade 6 speed to 8 speed
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12-17-06, 11:57 AM
I recently acquired a 80's era Serotta with a full Shimano 600 set-up. I was thinking of upgrading this bike from 6 speed to 8 speed. I am usually Campy guy so my knowledge here is limited.
What components need to be upgraded? I want to keep the shifting to downtube shifters and run them as friction.
What I think I need: an 8 speed rear hub, cassette, and new chain?
Will the existing deraileurs work with an 8 speed upgrade?
One more thing, where can I find a headset wrench for that crazy starfish nut?
12-17-06, 12:16 PM
You just missed a set of those wrenches on eBay:
A 32mm wrench will work if you're careful.
12-17-06, 12:40 PM
I tried converting 6 speed Shimano Exage to 8 speed and it didn't work. That's when I started getting into fixed gear.
But the good news is that 8 speed derailleurs are really cheap. The shifters should work just fine if they're friction.
You will need a new rear hub. Just go out and get a new cassette wheel. You have tons of choices.
With 8 speed, you won't have many choices for gearing in the back. Pretty much anything but 12-26 is hard to find. But a SRAM 8 speed cassette is about $30 and the chain will set you back about $20. Yes, you will need an 8 speed chain.
You will need to get your frame re-spaced (widened) if you want to do it right, although you can just pull the rear triangle apart and squeeze the new hub in.
Also, a 9 or 10 speed rear derailleur will work fine. Including campy.
12-17-06, 01:07 PM
I just measured the dropouts and the spacing is 130mm. Will I still have to respace?
12-17-06, 01:14 PM
No, unless you want to use an mtb hub, which you probably don't.
12-17-06, 01:15 PM
An try the existing derailleurs. They might work.
12-17-06, 01:23 PM
Eight speed doesn't require a different chain, either. There's no reason to change derailers.
12-17-06, 02:29 PM
Sweet! I was hoping for a cheap change over. The bike is already a tank anyway!
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