X3speed

As the title says, looking for 7speed Hyperglide freehub to fit a Shimano 105 - 126mm hub. I am having difficult time tacking one down. Any assistance would be greatly appreciated.

Mad Honk 

I'll look around here in the shop, there must be at least one out of all the hubs in the box. Smiles, MH

70sSanO

I think I can help. Your 105 "should" be an FH-1055 with a 7 speed UG/HG freehub body. The freehub body number is Y32E98020.

That freehub was also used on a FH-M62 and FH-M650 (DX).

You can probably use a Y32Y98010 off of an FH-6401 (600/Ultegra) or FH-5001 (Sante).

I went from 7spd to 8 spd on my DX FH-650 by swapping the freehub body with one off a 6401 freehub.

Best route is to buy a complete hub, (eBay), if possible, and move everything over. This is more important if you don't go with the original freehub. Loose Screws Bicycle Parts still has NOS 6401, 5000, and MT62 axle assemblies with cones.

Because you need to stay at 126mm OLD, you will need a thin shoulder flange 7 speed freehub body. The one on the lefty is a 7 speed thick flange. The one in the middle is your freehub body.



John

70sSanO

I think that you "may" be able to run a freehub body from an RSX 7 speed (HG "C" only). It would take some research to make sure it is a thin flange. I haven't done the swap. Depending on how badly you want a 7 speed and willing to take a chance, there is an NOS set (F+R) on eBay. It isn't cheap, but it is not as much as an 105SC (1055) NOS set that is also listed.

Good luck.

John

X3speed

So it currently has a ug only. My fear is that I get a fh that is too long.

X3speed

fingers crossed and thank you for looking!

X3speed

I need to stick with a 7 and really don’t want to buy a new hub and relace it. Using this for a vintage bike race.

KCT1986

If it is UG only, then it could be a FH-1051, assuming original freehub body is still on there.

Many freehub bodies from that time period would work, but the issues may be getting the correct model that uses the same type of right side seal. The 1051 uses the older type of dust seal, which consists of 2 fiber (?) washers, not the newer style with a rubber seal.

A couple of other hubs that use this seal type and is HG are the A550 (RX100) and the M550 (LX).

Here is a pic of what the seal with the 2 rings looks like.




Here is the newer type seal.



See the difference in part #7. They are different diameters.

X3speed

It is a 105 hub

X3speed

70sSanO

The first step is to determine if the freehub is toast, or just needs to be flushed out. There is a chance that you can soak it in solvent, if the pawls are not engaging, and then re-lubing it. I use Phil’s Tenacious Oil.

If you can get it to work, it will give you time to find a donor vintage freehub, either new or used.

Also, buying a new vintage hub doesn’t meaning using the hub, it just means you have all the necessary parts (freehub body, cone, seal, etc.) to install n your current hub. The rest of the parts are for future use; if necessary.

John

X3speed

I just want to buy an hg free hub body so I can buy an affordable cassette. A uniglide cassette with a 32t big cog is 2-300$

70sSanO

I guess the question goes back to what KCT1986 asked, which I now think is that you don’t have a UG/HG 7 speed freehub. A UG/HG freehub body allows you to use a cheap HG 7 speed cassette.

I don’t think Shimano makes a new 7 speed freehub body that will work with your FH-1050 (?) freehub; only makes an RM30-7(?). But, and I’ll have to defer to KCT1986 for using a old 7 speed UG/HG freehub body on you FH-1050 freehub.

If it will fit, buy a used or NOS complete vintage freehub and move the freehub body, cone, seal, spacer over.

John

70sSanO

One more thought. You can buy a 7 speed hyperglide cassette, take it apart, grind the wide tab off the cogs, install the cassette (line it up correctly), and then use a threaded 1st position uniglide cog.

I have one bike with a HG cassette and a threaded 13t UG cog.

John

KCT1986

Yes, that is the older seal with the 2 rings, as I expected.

The freehub body has a piece that is 'pressed' into it that needs to match the type of seal on the cone. See part #15 & #17 in the diagram posted earlier.

So, your options are:
1. Find a freehub body that used the same seals as mentioned in my earlier post and shown in the M550 pic.

2. Get a complete hub similar to the 2nd pic, (1055), and transfer the freehub body w/seal and the matching cone/dust shield. Or all the parts of the same if you can find them. This design was used by Shimano for quite a few years.

X3speed

going to look for a used or nos, but if anyone sees one please let me know.

X3speed

Will this work?
https://www.ebay.com/itm/16623197230...mis&media=COPY

pastorbobnlnh 

It is easy to modify HG cassette sprockets to fit on the UG freehub body. Disassemble the HG cassette, and Dremel the one large spline to the smaller UG size. You can use your original UG spacers and the smallest UG sprocket. You can also replace the original spacers with 9-speed HG spacers and fit 8 sprockets on the freehub body. However, you will now need to friction shift the RD.

I believe I can assist with a 30T or 32T UG sprocket. I'll PM you.

70sSanO

The only issue with just buying just a freehub body is not having the DS cone and seal. Not every Shimano cone is the same and a UG only seal won’t work.

Others who have done more mix-n-match swaps can correct me, but I believe, outside of the DA 74XX and the external spline RM series, any Shimano 7 speed HG compatible freehub body will work. Even on an older UG freehub. The important part is getting the correct body flange thickness to keep it at 126mm.

Buy a complete freehub and remove the body from it. You can mount a cog on an unlaced freehub, and to a wooden board to remove the freehub body.

John

sd5782 

A problem is finding the thin flange version. I went through the same thing and had several hubs to choose from at my co-op. It was not really possible for me to discern thick vs thin flange while they were mounted to the hubs as they sat in a recess at the flange area. My first $10 hub purchase turned out to be the thick flange. I got it right on the next one which was good as the only other one left looked a bit beat up. I believe you do need the uniglide/hyperglide version to go to 126 mm OLD as that one is around 31mm for the sprockets while the pure hyperglide is around 35mm. Going from memory here so double check. Good luck

edit; Checking parts revealed that the model 732 was the thick flange. The one I did wind up using was a Deore M550. I believe this hub may have been spaced wider, so I reused my original 6 speed uniglide axle. IIRC I tried six uniglide sprockets with spacers from an eight speed and then a uniglide small sprocket to lock it. There wasn’t enough threads to feel comfortable as the uniglide sprocket stack is 29mm. The uniglide/hyperglide 31mm was the ticket for me. I even have it spaced at 125 to match my frame.

Mr. Spadoni 

X3speed
understand that you are trying to keep your bike as close to original for the Gravel Worlds, but the HG modification that several people have suggested really is a era appropriate modification. We’re talking about a pre internet time, when parts from Shimano were rapidly changing. There were times when it was necessary to make parts fit, because original parts simply weren’t available. You can make this modification and stay true to the flame. It’s easy. Even for a ham handed mechanic like me, it took just a few minutes.

X3speed

Hye thank you, I did grind off one fat pline this morning, but took it down completely instead of leaving a skinny remnant. I have a 7 speed s ride casseette and I am hoping to just use the ug cog to lock it on. We will see, but I do appreciate the advice. I will need to stay 7 speed for the bike race I'm doing due to category rules.

X3speed

I did the mod this morning, but ended up grind one whole spline off. Hopefully that ends up not being an issue. I am unfortunately not great with a dremel.

Mad Honk 

OK I looked and here is what I have:

I am pretty sure these will work for your purpose.

The 105 on top is a UG/HG body and the black hub shows seven cog marks.

These have been laying on the bench top as well (two seven speed cog sets).
You may have all of this for the cost of shipping by USPS maybe $10-$12. Smiles, MH. PM me with shipping info.

X3speed

Sending you a pm! You rock!!!