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 Post subject:
PostPosted: Sat Jun 02, 2012 3:33 pm 
Retro Guru

Joined: Wed Nov 02, 2011 11:29 pm
Posts: 554
Location: Sheffield
OK, I should learn to look harder. I've got a spare 23 (lightly used) and an unused 28 which I have been keeping since 1988, "just in case"... Not sure if your mech would reach round it, but it might provide a workable bail out gear.
Nick


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 Post subject:
PostPosted: Sat Jun 02, 2012 4:58 pm 
rider | rBoTM Winner
rider | rBoTM Winner
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Joined: Fri Jan 25, 2008 1:42 pm
Posts: 5131
Location: Wakefield, Yorkshire
I used a mix of 7 and 8 speed sprockets to make up a lower geared (13 - 28 ) 8-speed cassette for the Pendle Witches event. Worked fine.

My legs didn't.


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 Post subject:
PostPosted: Sat Jun 02, 2012 5:18 pm 
Dirt Disciple

Joined: Thu May 31, 2012 2:13 pm
Posts: 36
Location: Romford
Thanks everyone. I'm away for a few days now so ill pick this up when I get back (otherwise I'll be in the wifes bad books for being on a pc on holiday!! )
:)


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 Post subject:
PostPosted: Sat Jun 02, 2012 11:27 pm 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5785
Location: Lost in Translation
That's a Dura-Ace 8-speed Uniglide cassette.

foz wrote:
If I'm not mistaken (again!) then you can also use HG sprockets on a UG-only body, all except the last (smallest) one that must be UG.

Hyperglide sprockets can be used if modified by filing down the single wide spline. You're right about the smallest sprocket, but note that Dura-Ace used a smaller diameter thread than other Uniglide hubs (to allow an 11t sprocket to be used) making replacements very hard to find now.

Quote:
The difference in thickness between 7 and 8 speed sprockets is minimal, you shold have no trouble at all mixing them up a bit.

For Uniglide there was no difference - only the spacers differed in thickness.


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 Post subject: D'oh!
PostPosted: Sat Jun 02, 2012 11:39 pm 
Retro Guru

Joined: Wed Nov 02, 2011 11:29 pm
Posts: 554
Location: Sheffield
one-eyed_jim is quite right; I ought to read my own box and velobase more carefully! It is indeed uniglide, as are my spare 23 and 28 sprockets. Apologies for sowing more confusion.

If the threaded sprocket is a problem, I have an unused 13 tooth Dura Ace uniglide one that you are welcome to. My guess is that it is the bigger sprockets that are the issue in this case though.

Nick


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 Post subject:
PostPosted: Sun Jun 03, 2012 12:50 pm 
Dirt Disciple

Joined: Thu May 31, 2012 2:13 pm
Posts: 36
Location: Romford
I'm still a bit cautious about this as I see a lot of differences between the photos of the cassettes and my photos.

Is it possible that the hubs were designed for 7 speed but someone has stuck on an 8 spd freewheel ?


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 Post subject:
PostPosted: Sun Jun 03, 2012 1:14 pm 
Retro Guru
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Joined: Mon Jan 24, 2011 4:05 pm
Posts: 279
Location: Kent / SE London
If you google "Sheldon Brown Dura Ace Compatability", there's a bit about the 8 speed Uniglide and ways around the common issues. Apparently they only used them for one year, so replacement issues aren't uncommon.[/i]


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 Post subject:
PostPosted: Sun Jun 03, 2012 2:30 pm 
Newbie

Joined: Thu May 31, 2012 12:15 am
Posts: 3
I just purchased two used MF-7400-7s if you are interested in one of them.
Both are 13-14-15-17-19-21-24T.

I think it will be exceeding difficult to find the 13-15-17-19-21-23-26T configuration. I've been looking for a while, but I do know someone who picked one up on eBay last year.

We're in the same boat with getting older and wanting lower gearing!


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 Post subject:
PostPosted: Sun Jun 03, 2012 10:51 pm 
Dirt Disciple

Joined: Thu May 31, 2012 2:13 pm
Posts: 36
Location: Romford
John Bertram wrote:
I just purchased two used MF-7400-7s if you are interested in one of them.
Both are 13-14-15-17-19-21-24T.
is this a freewheel?
If mine turns out to be a freewheel and not a cassette, then i will be in touch. Thanks. I need to find somewhere that can remove it first!!

John Bertram wrote:
We're in the same boat with getting older and wanting lower gearing!
Good to know im not alone :D. I also want to lower the chainring. I have 39/53 but want to replace my 53 ring with something smaller...perhaps 50t. But I doubt dura ace came in smaller than 52 (?) so need to find out if there's compatible rings.


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 Post subject:
PostPosted: Sun Jun 03, 2012 11:16 pm 
Newbie

Joined: Thu May 31, 2012 12:15 am
Posts: 3
Yes, it's a freewheel. If it says MF-7400, it's definitely a freewheel. Check out this page from the 1989 Shimano catalog:
http://www.disraeligears.co.uk/Site/Shi ... an_11.html

Anyway, I a wearing a knee brace as we speak because my knees can't handle the hills, but I love my bike and components!


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