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Old 08-19-09, 01:46 PM   #1
Dhorn33
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7 speed to 8 speed

I did a search on this but wanted some clarification. I have a rear wheel with Shimano Exage 500 hub that has a 7 speed cassette on it. I also have another rear wheel with a Shimano 600 hub with and 8 speed cassette - HG-C I think? Anyway - I tried to install the 8 speed cassette on the 7 speed freehub only to discover that there seems to be some material blocking the cassette from going on the hub far enough to be able to fit the 8th gear. After doing some reading online - it sounds like I have a few options:

1. Get an 8 speed wheel! (too expensive right now.)
2. Swap the 8 speed freehub body in place of the 7 speed one. This seems easily doable - until I got to the part of redishing the wheel. Is that necessary and how does one go about doing that?
3. Get a 9 speed freehub body, cassette and chain - but only install 8 of the gears. This one sounds way more expensive than what I want to spend.
4. ???

So what are my options -and what do you recommend based on a very limited budget? (btw - the 600 hub and 8 speed is on a 650c wheel - otherwise I would just use it!)
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Old 08-19-09, 01:55 PM   #2
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Is your 8-speed cassette a 'compact'?
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Old 08-19-09, 01:58 PM   #3
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I believe that it is - it has an 11 tooth small cog and I think it is IG -C or something like that? The entire cassette slides on the freehub body - but the 7 gears take up all the room so there isn't room for the 8th one.
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Old 08-20-09, 09:02 AM   #4
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Last night I swapped the freehub body on my wheel from 7 speed to 8. I also had to use the axle from the 8 speed wheel since it was 130mm vs. the 126 on the 7 speed one. I didn't redish anything and the wider axle seemed to fit pretty easily into the Bianchi frame. It appears to line up correctly in the frame - so I think I will go with it for now.
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Old 08-20-09, 09:13 AM   #5
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Originally Posted by miamijim View Post
I'd need more specfics but I just installed an 8-speed cassette on a 105SC 7-speed hub with no issues.

Is your 8-speed cassette a 'compact'?
Sorry Jim, but I'm going to have to cry foul on this one. Maybe someone had already made the body transplant before you got the hub, but there is a measureable difference in the body length between the 7 and 8/9 bodies. Get out your ruler, I'll bet you have an 8/9.
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Old 08-20-09, 09:19 AM   #6
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Agreed. I took the freehubs of and set them next to each other and the 8 speed was longer - but the thickness of 1 gear. (duh!) This was a super easy swap and took about 5 minutes so I am glad I took the time to do it. I have been collecting wheels from dumpsters to use for spare parts so this was a free swap for me.
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Old 08-20-09, 09:46 AM   #7
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Sorry Jim, but I'm going to have to cry foul on this one. Maybe someone had already made the body transplant before you got the hub, but there is a measureable difference in the body length between the 7 and 8/9 bodies. Get out your ruler, I'll bet you have an 8/9.

I'll look into it and report back later.
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Old 08-20-09, 03:07 PM   #8
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Originally Posted by Bob Barker View Post
Sorry Jim, but I'm going to have to cry foul on this one. Maybe someone had already made the body transplant before you got the hub, but there is a measureable difference in the body length between the 7 and 8/9 bodies. Get out your ruler, I'll bet you have an 8/9.
4.5 millimeters difference to be exact
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Old 08-20-09, 04:41 PM   #9
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Originally Posted by Bob Barker View Post
Sorry Jim, but I'm going to have to cry foul on this one. Maybe someone had already made the body transplant before you got the hub, but there is a measureable difference in the body length between the 7 and 8/9 bodies. Get out your ruler, I'll bet you have an 8/9.
You are correct. Although my hub is a 7-speed it helps if all 8 cogs are installed.
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