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A 6 speed cassette in a 10 speed world

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A 6 speed cassette in a 10 speed world

Old 07-04-06, 09:33 PM
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evictionsurplus
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A 6 speed cassette in a 10 speed world

Hey Kids,
Ok, so I ride a circa 1989-90 Cannondale Criterium. I love the bike, and I will ride it until I get hit by a car or T-bone a horse or something like that. Anyhow, it has a 6 speed cassette. I want to get new derailleurs, but whoops, Shimano 105 6 speed products no longer exist.
What is a fellow to do?
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Old 07-05-06, 12:07 AM
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Ebay, my friend. Picked up a NOS 6-speed Dura Ace rear derailleur for my vintage mtn bike about a year ago from off of there.
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Old 07-05-06, 12:56 AM
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Upgrade to 9 speed hub.
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Old 07-05-06, 06:03 AM
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I currently have a Shimano 600 RD from the 6 speed generation that I am not using. I think the model number is RD-6207 (not 100% sure, don't have it in front of me). It is in great functional condition, with a few scratches/paint rubs on the outside. It doesn't look like it has ever been crashed, and really it looks like it is simply shop-worn.

I also have the matching Shimano 600 6 speed freewheel that looks like it has never been used.

I don't think I will ever have any use for these. I got them as a matching set with the crankset, BB, and FD, which I put on my commuter bike (see signature link for pic). If you are interested, I will sell them to you at a good price. Just send me a PM.



Oh, and by the way, 105 6 speed stuff does still exist. You just have to look for it. I got the 600 stuff off of Ebay.
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Old 07-05-06, 06:50 AM
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Definitely eBay is a treasure trove ifr you are looking for nice vintage components...

I bought a couple of very nice 600 RDs for under $10 each with shipping.

Also, there are options if you want to buy new... I believe you can use derailleurs rated for more gears, as long as the cable pull is the same if it is indexed, and the chain width is not an issue. I would have little problem buying an 8 speed derailleur for a 6 speed freewheel... since when I buy chains, they use the same chain for 6, 7 or 8 speeds...
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Old 07-05-06, 06:59 AM
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If you are using friction shifters, you can use whatever derailleur you like.
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Old 07-05-06, 07:02 AM
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I'm using a 10-speed 105 rear derailleur with an 8-speed chain on a 7-speed cassette with no problems whatsoever. The derailleur doesn't care how much cable the shifter pulls with each upshift.
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Old 07-05-06, 09:49 PM
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Originally Posted by DieselDan
I'm using a 10-speed 105 rear derailleur with an 8-speed chain on a 7-speed cassette with no problems whatsoever. The derailleur doesn't care how much cable the shifter pulls with each upshift.
Exactly. The rear derailleur doesn't give a damn if it is shifting over a two or ten cog cassette. The rear derailleur just does what the shifter tells it to do. The indexing is in the shifter, not the derailleur. As long as the acutation ratio between the shifter and rear derailleur is compatible, everything is golden.
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Old 07-07-06, 10:56 AM
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I have the same 6 speed set up and I want to switch to sti shifters is that going to be a big hassle...I was told tht I would need to get a new rear wheel??
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Old 07-07-06, 11:55 AM
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Originally Posted by operator
Upgrade to 9 speed hub.
the spacing is different, 6 speed should be a 126mm, 9 speed is 130mm.

and i would not bend aluminum.

http://sheldonbrown.com/gloss_sp-ss.html#spacing
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Old 07-07-06, 01:48 PM
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Originally Posted by DieselDan
I'm using a 10-speed 105 rear derailleur with an 8-speed chain on a 7-speed cassette with no problems whatsoever. The derailleur doesn't care how much cable the shifter pulls with each upshift.
That is true for most Shimano derailleurs, but not true for pre-9-speed Dura-Ace which has a different cable pull ratio. Pull ratio is an issue if the shifters are indexed.

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Old 07-07-06, 05:14 PM
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Originally Posted by DieselDan
I'm using a 10-speed 105 rear derailleur with an 8-speed chain on a 7-speed cassette with no problems whatsoever. The derailleur doesn't care how much cable the shifter pulls with each upshift.
Same ! I have a 9speed 105 rear der. on a 7 speed screw on free wheel operated by a 7speed rapid fire MTB shifter mounted on the tops of the h/bar, works well !
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