Bicycle Mechanics - Can I make my 7spd into a nine?
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So lets say I want to turn my 7spd G-fisher in a nine, 10, ext.? How do I go about finding out if I can put more cogs on it?
It's no problem if it's a Shimano. Just buy a new 8/9 sp cassette hub body. Now you can use 8/8/10 cassettes on your old wheel. You'll probably need to redish it. Most Shimano 7 sp derailleurs can handle a 9/10 sp cassette.
Sounds like a good project. Good luck and don't forget the brifters, they're the most expensive part of the project.
12-26-07, 07:19 AM
I don't understand the redishing part. Dish is measured from the lock nuts on the axle. Do you have to change the standard 130mm or 135mm width?
12-26-07, 08:30 AM
Check to see if you have a freewheel. If its a freewheel wheel, you can change the free wheel to a 8speed. If you want nine, then you'll need a new wheel
12-26-07, 08:49 AM
8 speed freewheels were never that great an idea as the installation of one requires that you add spacers to the drive side and also have to redish the wheel.
On a freewheel hub this results in even more unsupported axle and leads to a higher probability for bending or breakage of the axle.
A freehub is the way to go.
Since the bike is a G. Fisher, I will assume it's a MTB with 135mm axle spacing. You may or may not need to redish. Because the drive side bearings are riding in the freehub body cup. If you swap the 7 speed body for a 8/9/10 body, it's longer, and the cup may be at a different location. The 7 speed drive side axle spacers may be different, and you may need shorter spacers.
Fishon, I recently upgraded my GT LTS DH from 7 speed to 9 speed. It went exactly as Sheldon Brown describes (if you need the link, let me know). I purchased a Shimano 8/9 speed freehub body, which is wider than the original 7 speed freehub body. I then put on a new 9 speed SRAM cassette. The wheel did need to be redished slightly, as the wider freehub moves the "centre" slightly.
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