Positron400

Hi,

i bought a, what appears to me, 36 Hole UG rear hub, to change the freewheel on my new bike to a freehbub type.
Litte did I know, that now i have to find a UG cassette, as i was under the impression, that i could just use a 7-sp HG cassette. (I recon there are ways to fit a HG casette to a UG body, please do let me know)
What's even more weird to me is, that the O.L.D. is 124 mm. The height of the freehub body seems to be ~32.4 mm.
Can i fit a 7sp HG casette on there (with modifications)? Should I/can i switch out the freehub body? What are my options?



OLD

markings on the hub

bearing seal?

Bill Kapaun

You can file the narrow notch on 6 of the HG cogs, but you'll still need a Uni Glide threaded end cog to hold everything together.

Positron400

that seems feasible, but will the 6 sprockets fit on the 32 mm hub body with enough space for the 7th?

Bill Kapaun

If it doesn't, you have a 6 speed.
Personally, I'd sell the UG to somebody that wants to be "period correct" and look for a HG hub. Why fight it?

Positron400

Not so much "fighting it", just looking for options. I have a hard time finding 126 mm OLD hubs with casettes

Bill Kapaun

And you think using an older technology is going to make life easier?
You made a mistake. Don't compound it.
It's pointless to try justifying it.

Positron400

It's definitely easer than using a freewheel.
But thanks for sharing your opinion.
Maybe someone else wants to chime in.

rccardr 

Yes, you can use HG cogs for all but the first on a 6 speed, pretty sure you need a second threaded UG cog for a seven speed. All younhave to do is file/Dremel one flange to make them fit.

However.

I’m in agreement with Bill on this one and would shop around- maybe post a WTB in the for sale section- for a 126mm HG compatible rear hub. Don’t complicate your life unless you really have to.

Jeff Wills

You don't have many options. The only realistic option is to modify a Hyperglide cassette to fit, but you'll still need a Uniglide small cog to hold it on. I'm pretty sure a 7-speed Hyperglide cassette will fit lengthwise since 7-speed uses thinner spacers than 6-speed.

Here's the bad news: that's an early Uniglide hub, where the cassette body is pressed onto the hub and held in place by friction. Later hubs, which used threads or a hollow bolt to hold the cassette body on the hub, have a distinctive bulge on the hub body by the right flange. There's no cassette body that interchanges with this one and the mounting spud has a tendency to wear, leading to a ruined hub.
(See School me on this hub and freewheel - Bike Forums for pictures of a ruined Uniglide hub.)

Unless you're doing a concours restoration and need to use the exactly correct hub for your bike, I'd throw this back. For your setup you need to find a 7-speed Hyperglide hub from the late '80's or early '90's. They are out there, and Shimano was making really good products even at the lower price points. A 7-speed 105 or RM40 hub would be perfect.

Bill Kapaun

Exactly HOW is it easier? Show me the way.....
Apparently you've already forgotten why you started this thread.

Positron400

Ah thanks - yea.. I guess there is no point in using this then, despite it is in, what looks to me, almost NOS condition.