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Dura Ace 6 speed to 7 speed.. what is this?

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Dura Ace 6 speed to 7 speed.. what is this?

Old 05-07-17, 08:59 AM
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Dura Ace 6 speed to 7 speed.. what is this?

hey all, I know this is answered a million times here but there is so much confusion I'm still confused since there is not any pictures... here is what I have... its a dura. ace 6 speed hub, and I want 7 speeds what cassette do I have?
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Old 05-07-17, 09:02 AM
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6.
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Old 05-07-17, 09:04 AM
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I guess I should edit that lol is it a freehub/uniglide/ old new? freewheel? haha what cassette do I need to make this a 7 speed lol
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Old 05-07-17, 09:05 AM
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That's a uniglide cassette. I dunno if a 7 speed one will be easy to find or not. There are folks that have filed the tabs off a hyperglide cassette and just used the thread on sprockets instead of the HG lock ring and first sprocket. You'd wanna check the specifics on the old dura ace to see if it is compatible with other stuff, there were a few oddballs bitd
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Old 05-07-17, 10:23 AM
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Originally Posted by clasher
That's a uniglide cassette. I dunno if a 7 speed one will be easy to find or not. There are folks that have filed the tabs off a hyperglide cassette and just used the thread on sprockets instead of the HG lock ring and first sprocket. You'd wanna check the specifics on the old dura ace to see if it is compatible with other stuff, there were a few oddballs bitd
ok thanks.. I'm almost not confused lol when I got this bike it had already been upgraded to 105 8 speed STI shifters on 6 speed uniglide dura ace hubs...
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Old 05-07-17, 10:42 AM
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Find a Shimano 105 or Ultegra hub and re-lace the wheel. Find one a few years old. You should even be able to reuse the spokes.
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Old 05-07-17, 12:51 PM
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Least expensive way to do this is to buy a Shimano/SRAM 7 speed HG cassette, take it apart, file down the one narrow slot to the same size as the others, then use 6 of the 7 cogs and spacers. To hold it on the freehub, you'll have to slightly reduce the thickness of the built-in spacer on your existing DA small cog, which must be used because it has a smaller thread diameter than non-DA small cogs. A Dremel tool works well for all of that work, but it can also be done, if somewhat laboriously, with a good hand file, acompanied by a few beers.

More expensive is to source a UG 7 speed cassette with the cogs you want, do the same deal on the small cog, etc. They are out there but getting harder to find in specific sizes.

Certainly lacing up a newer 8-9-10 speed hub to your existing rim and spokes will also work, but having just done what you're contemplating I felt using the original hub was somewhat more elegant.
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Old 05-07-17, 02:13 PM
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Originally Posted by rccardr
To hold it on the freehub, you'll have to slightly reduce the thickness of the built-in spacer on your existing DA small cog, which must be used because it has a smaller thread diameter than non-DA small cogs.
Actually, unless I'm thinking incorrectly, since the last cog's derailleur position is set by the limit screw you probably could get away without altering the small cog.
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Old 05-07-17, 06:49 PM
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Originally Posted by rccardr
Least expensive way to do this is to buy a Shimano/SRAM 7 speed HG cassette, take it apart, file down the one narrow slot to the same size as the others, then use 6 of the 7 cogs and spacers. To hold it on the freehub, you'll have to slightly reduce the thickness of the built-in spacer on your existing DA small cog, which must be used because it has a smaller thread diameter than non-DA small cogs. A Dremel tool works well for all of that work, but it can also be done, if somewhat laboriously, with a good hand file, acompanied by a few beers.

More expensive is to source a UG 7 speed cassette with the cogs you want, do the same deal on the small cog, etc. They are out there but getting harder to find in specific sizes.

Certainly lacing up a newer 8-9-10 speed hub to your existing rim and spokes will also work, but having just done what you're contemplating I felt using the original hub was somewhat more elegant.
id like to just build up the HG dura ace hub but i had just had the new tubulars glued on... then thought... hmmm maybe there i a way to add a gear lol ive read about some removing the UG body and swapping out the internals with that of an HG body but 7 speed HG cassettes arent cheap or easy to find either in light weight road applications
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Old 05-07-17, 07:18 PM
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Swapping old DA freehub bodies is not for the faint of heart. Search through Sheldon Brown's archives and you will see that different mounting systems were used over time so it can be tricky to know what will fit what.

I would do what the good doctor suggested, but know that you will need a 2nd position cog on there that has the spacer built in and the teeth to mate with the splines on the spacer side. The original DA sprockets were like this. Take it apart (you'll need two chain whips) and you'll see.

You should be able to get a 7s cassette on there, but you'll need 1st and 2nd position Uniglide Dura Ace sprockets - either 7s or 8s will work. These are hard to come by, there are only a few examples on eBay at the moment.

16s 1st position lockring (not sure who would have such a large sprocket in the first position... unless you want a 17t sprocket in the 2nd position.

Or if you have the patience, you can carefully grind the 6s sprockets down. I have done this with a disc sander and constant checking with calipers - also not for the faint of heart.

If you have a 32-spoke wheel, you could for sure swap your hub out for this 8-speed Dura Ace Uniglide hub, but you'll need the special 1st and 2nd position sprockets.
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Old 05-07-17, 07:29 PM
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Like Dave said, it's easier to swap freehubs on non-DA Shimano products than the rest of their lines. DA is the odd one out, at least until 9 speed 7700 was released. So you can put 7 speed HG/UG cogs and spacers on your 6 speed freehub, allowing for the first (and possibly second, although we could talk further about that) cogs, OR you can swap out the whole hub with something Shimano that's not DA. But forget about swapping DA freehubs.
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Old 05-10-17, 05:53 PM
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hmmm yeah, it sounds pretty good project which I'm capable of doing... the small sprocket on my 6 speed is a 14T if I remember correctly... so maybe I could get by with the 16T for 2nd cog? now I guess I just need a 7 speed HG ? I see my cogs are not HG ramped... would I end up with some ramped and others not ramped? prices on the7 speed uniglige cassettes is astronomical lol the 1 or 2 I found from a far far land on eBay lol
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Old 05-10-17, 06:58 PM
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Yes, old UG cassettes are expensive because there aren't that many of them around. Back then most 6-7 speed bikes (including many Dura Ace) used freewheels instead of freehubs. Which is why there's a buttload of nice 13-28 6 speed UG freewheels out there but few comparable cassettes. However, any UG cog above the first one will work with any number of UG speed freewheels. Only the first one has to be the correct size thread (DA or regular) and spacer (marked 6-7-8 speed). Since 7 and 8 have the same spacing, you only have to modify a 6 speed first cog if you want to use it on a 7 speed cluster, and even then not much.

This would be so much easier if you could bring your bike to the SUL, we could work this out in like 20 minutes....
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Old 05-12-17, 12:40 PM
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i read that a few times and actually I do have a new 9 speed ultegra HG cassette and considered just building a new wheel however.. this is on a Vitus 979 bonded frame so dont think it is wise to spread the drops... I looked at the ultegra cassette and was wondering where Id drill to separate the cogs and spacers... its so shiny everywhere maybe I can see a pictorial of this someplace online.... but its such a nice cassette I hate to destroy it since I have the matching new ultegra derailleur ...
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Old 05-12-17, 08:21 PM
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Sheldon has a tutorial on filing out the wide tooth spline on an HG sprocket. Not hard at all to do and it still works on either hub.
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Old 05-15-17, 09:27 AM
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Originally Posted by rccardr
Yes, old UG cassettes are expensive because there aren't that many of them around. Back then most 6-7 speed bikes (including many Dura Ace) used freewheels instead of freehubs. Which is why there's a buttload of nice 13-28 6 speed UG freewheels out there but few comparable cassettes. However, any UG cog above the first one will work with any number of UG speed freewheels. Only the first one has to be the correct size thread (DA or regular) and spacer (marked 6-7-8 speed). Since 7 and 8 have the same spacing, you only have to modify a 6 speed first cog if you want to use it on a 7 speed cluster, and even then not much.

This would be so much easier if you could bring your bike to the SUL, we could work this out in like 20 minutes....
GREAT! where is SUL!?? lol. btw my first real bike I bought in Texas was a beautiful canon dale 3.0 criterium with red white color and Shimano 105 set.. I loved that bike but had to sell it to make a move early on in my life... I rode all the time in Texas ... I keep looking for that bike or same online...
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Old 05-15-17, 11:54 AM
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Old 05-15-17, 12:11 PM
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Originally Posted by dparham
... when I got this bike it had already been upgraded to 105 8 speed STI shifters on 6 speed uniglide dura ace hubs...
Does it shift ok with this setup? If so, I'd just ride the 6 speed. Half my bikes are 6 and half are 7, (and a couple are 5), and I forget and don't really notice which is which while on the road.
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Old 05-15-17, 08:23 PM
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Originally Posted by dparham
GREAT! where is SUL!??
Shhhhh, it's a secret!
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Old 05-17-17, 05:16 PM
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Originally Posted by jeirvine
Does it shift ok with this setup? If so, I'd just ride the 6 speed. Half my bikes are 6 and half are 7, (and a couple are 5), and I forget and don't really notice which is which while on the road.
yup it shifts pretty good however not so sure yet about the spring in the rear derailleur .. when in lowest front and rear cog, the chain is loose.. but if I remove a link or 2 its too tight for the larger cog... its possible I could go with a tighter cog setup but thinking it could be the spring in the rear derailleur?... I need to look at it closer... I got a little frustrated since it doesn't have the B Screw , I'm used to using the B Screw lol
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Old 05-17-17, 07:02 PM
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It sounds like you are describing a little-little scenario. One generally avoids the smallest chainring in front and the smallest sprocket in the back - you experience the slack chain you describe, it is likely not a lack spring tension.
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Old 05-21-17, 06:41 PM
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Originally Posted by mountaindave
It sounds like you are describing a little-little scenario. One generally avoids the smallest chainring in front and the smallest sprocket in the back - you experience the slack chain you describe, it is likely not a lack spring tension.
I think i have just gotten used to mountain bike setups this last decade and they take up chain slack pretty well... when I rode bike I didnt notice it as much as just once I back pedaled and chain wanted to come off... didnt seem to repeat... on my veloce it has a longer cage and deals with the gearing better... plus is has smaller front chainring... im just guessing at this point lol it wasnt a real big issue just making sure I did it correctly
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