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Can a 7 Spd Cassette go 6 Spd Bike???

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Can a 7 Spd Cassette go 6 Spd Bike???

Old 05-01-19, 07:41 AM
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allout1
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Can a 7 Spd Cassette go 6 Spd Bike???

My parts bike has the new 7 spd shifter on it, and my current riding bike has the 6 spd cassette and frame.

So what happens when people put their 7 spd wheel and cassette into the 6 spd frame? I could squeeze it in there, but I'm leery that things will wobble out of their fixed stations. This bike takes MTB abuses and usage, so...
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Old 05-01-19, 08:05 AM
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It depends......

Frame may be built for a narrower OLD (wider hub) for the 6 speed, or it may not. Unlike 8-9-10 speed, which are all the same width cassette with narrower gears, 7 speed is very close to the same spacing and wider.
I guess I should specify that I am assuming Shimano components.

If the OLD (outside locknut distance, the distance between the dropouts with the wheel installed) is the same, you should be able to swap to 7 speed very easily.

MTA: The 6 speed is probably a freewheel, not a cassette (threaded interface vs. splined), the 7 speed could be either but likely a freewheel as well.
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Old 05-01-19, 08:09 AM
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Also just pointing out that shifting might be FUBAR....indexing will probably be off. You might want to change rear shifter to the friction option.

Dan
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Old 05-01-19, 08:20 AM
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Originally Posted by allout1 View Post
... my current riding bike has the 6 spd cassette and frame.
So, 6-speed Uniglide freehub? Have you removed the lockring and looked at the freehub body? Bolt-on or press fit. These are important things...

If bolt-on type, you can replace the freehub body with a modern Hyperglide replacement. Then, you're good. If press-on type, then you must modify the Hyperglide cog inner tabs to fit over the freehub body.

https://www.sheldonbrown.com/k7.html

^This page should help you.

Last edited by Phil_gretz; 05-01-19 at 08:22 AM. Reason: Added link
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Old 05-01-19, 10:44 AM
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you need to identify if you have cassette or freehub first (watch park tools cassette type video on youtube) then go from there.
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Old 05-01-19, 10:51 AM
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ooooo, together forever! ^
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Old 05-01-19, 11:27 AM
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This guy just joined and is posting thread after thread about really strange stuff. A good chain is $25 and will last a while, who asks about a "cheap" chain? Was a six speed cassette ever even made, I thought it was all freewheels back then? What are we talking here anyway, a 35 year old bike? Where exactly does one procure a "new 7 speed shifter"?

Please stop spamming the board.
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Old 05-01-19, 08:31 PM
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New 5,6,7 speed shifters are widely available, as are the cassettes and freewheels. They're almost all compatible as the ratio is common. They also fit almost all bike frames.

To swap an old 6sp set up for a new 7sp set up, simply remove the cassette/freewheel and shifter, and fit brand new ones. Each cost from less than a tenner.

Tip - use 8-speed. It's the sweet-spot of set-ups imo.
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Old 05-05-19, 12:07 PM
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Okay, I'll go with this, and start to figure it out. I'll update this as it goes.
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