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Magic required: 6sp to 9 sp conversion?(5 posts)

Magic required: 6sp to 9 sp conversion?buffedupboy
Dec 6, 2003 1:23 AM
Hi all,

Out of the blue, I was just wondering whether it is possible for a 6sp hub to be converted somehow to have 9 working cogs?

Logically I know there is no chance but hey, what does the bicycle world think? I've seen weirder stuff. C40, whatdaya think?

Regards,
Sean
I don't think so.Spoke Wrench
Dec 6, 2003 4:23 AM
Cassettes are what made the higher number of cogs useable.

Cassette freehub bodies allow the rightmost set of axle bearings to be moved way over to the right - actually within the freehub body itself. Spin-on freewheels make it necessary for the axle bearings to be set within the hubshell much nearer to the middle of the hub. As you leave more and more unsupported axle sticking out, the potential for bent axles increases. I think that I've seen 7 and 8 speed freewheels offered for sale, but I think there is a good reason why they never became popular.
7 spd FW OK, but 8 spd is the limitKerry Irons
Dec 7, 2003 7:08 PM
Assuming this was a "normal" and not "narrow" 6 speed, then a 7 speed will fit in the same spacing. The narrow 6 speed fit in a 5 speed spacing. There were some 8 speed FWs produced and they may be still out there, but by then cassettes had taken over the world. There should be no problem putting a 7 speed FW on a 126 mm spaced hub, but after that . . .
re: Magic required: 6sp to 9 sp conversion?MShaw
Dec 8, 2003 11:12 AM
The only way I can think of to do what you're looking to do is shave an 8sp FW's spacers (and maybe the cogs). Even then I don't think it'll work.

You'll need to space your hub at 130mm OLN too.

Mike
Yes if 6 speed hub is (non-Direction-6) Dura-Ace cassette...satanas
Dec 14, 2003 10:22 AM
...and you fit the 8 speed HG body, which is compatible with a 9 speed cassette. You will possibly need a new axle (or a few spacers) and RH cone so the seals will work with the new cassette body. Whether this is ecoonomically viable is another matter.