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Looking for 7-speed Uniglide Cassette

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Looking for 7-speed Uniglide Cassette

Old 06-05-12, 11:29 PM
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Looking for 7-speed Uniglide Cassette - found!!

I'm trying to upgrade an '88 Specialized Sirrus from 6 to 7 speed and all I need is a UG cassette. Don't want to go HG as I want to keep it vintage (I know it's not all that vintage, but still). Cassette just needs to be functional with at least one good side of the sprockets left. A 26T sprocket would also be handy in the mountains with my 52/42 chainrings - only have 23T currently.

Thanks,

MD

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Old 06-06-12, 05:03 AM
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Originally Posted by mountaindave View Post
I'm trying to upgrade an '88 Specialized Sirrus from 6 to 7 speed and all I need is a UG cassette. Don't want to go HG as I want to keep it vintage (I know it's not all that vintage, but still). Cassette just needs to be functional with at least one good side of the sprockets left. A 26T sprocket would also be handy in the mountains with my 52/42 chainrings - only have 23T currently.

Thanks,

MD
Dang. I just sold a 13-26 7-speed uniglide cassette last fall. It had been sitting in my parts bin for a year and I didn't think I'd ever need it. I'm sorry now. Phil G.
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Old 06-06-12, 07:03 AM
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And I just missed one on eBay (12-21 so not a huge loss) yesterday. I'm sure it went to a good home. thanks anyway.
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Old 06-06-12, 07:12 AM
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Another way to go is to buy the individual UG cogs (in your case maybe just the 26tooth) and seven speed spacers (probably easy to adapt HG spacers to work in this instance). If your particular UG cassette is riveted together (instead of bolted) just grind the rivet off, free the cogs, and respace with the additional cog. It's that simple. You don't need the rivet or the bolt because the outside cog holds the whole cassette together.
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Old 06-06-12, 07:21 AM
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https://www.loosescrews.com/index.cgi...d=548016712500
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Old 06-06-12, 08:13 AM
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Thanks for the tips. Shows what I know about HG, didn't know they used spacers too. Thanks for the link, I'll keep checking it. The only large sprocket they currently have is 34T, just a bit too many teeth for me.
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Old 06-06-12, 10:45 AM
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I probably have the cog and spacers you need. I'll check the spares this evening and try to get back to you. If you don't hear from me by Friday, jog my memory.
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Old 06-07-12, 07:56 PM
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Thanks!
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Old 06-07-12, 08:51 PM
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Originally Posted by pastorbobnlnh View Post
Another way to go is to buy the individual UG cogs (in your case maybe just the 26tooth) and seven speed spacers (probably easy to adapt HG spacers to work in this instance). If your particular UG cassette is riveted together (instead of bolted) just grind the rivet off, free the cogs, and respace with the additional cog. It's that simple. You don't need the rivet or the bolt because the outside cog holds the whole cassette together.
Wasn't this one of the main advantages of UG - and why Shimano went to HG to increase cassette sales?
If I was going to do a cassette, I would try to build up an older UG.
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Old 06-08-12, 06:35 AM
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Originally Posted by bikemeister View Post
Wasn't this one of the main advantages of UG - and why Shimano went to HG to increase cassette sales?
If I was going to do a cassette, I would try to build up an older UG.
Many Shimano HG and SRAM cassettes can still be taken apart. In fact these are the ones I prefer because it makes a yearly cleaning very simple. Even the new cassettes don't need to be bolted together to work on the freehub. The lockring holds the whole thing together. The bolt or rivet is just there to make installation on the freehub easier.

Actually the reason behind the HG cassettes had to do with improved cog design and a smaller outer cog. With the UG freehub the smallest cog was a 13 tooth threaded locking one. Also the UG cogs had "twisted" and some "shortened" teeth for shifting enhancement. The HG introduced cog sizes down to 11 tooth and ramps and special teeth for improved shifting. HG was a pretty significant leap forward in technology over the older UG system.

Another change between the UG and HG system was the need to properly align all the cogs. This was not an issue with the UGs. But the HGs needed each cog to be aligned perfectly due to the placement of the ramps. Thus Shimano introduced one wider grove in the freehub and a corresponding wider notch inside the cassette. This insured that each cog was properly aligned with the one before it and after it.

I do not believe Shimano made the change in order to generate more sales.
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Old 06-08-12, 07:27 AM
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That would be my understanding as well, Bob. The one advantage UG still holds over HG (for frugal vintage nuts like me) is that worn sprockets can simply be turned around for a new lease on life (with a new chain of course).

Somewhere Sheldon Brown is smiling down on us.
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Old 06-14-12, 08:53 PM
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Bob's the man! Cassette found!! Thanks so much!
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