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BSA QD rear hub ID please #412204
01/07/12 8:30 pm
01/07/12 8:30 pm
Joined: Mar 2007
Posts: 1,163
Winona, MN
Swan Offline OP

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Swan  Offline OP

BritBike Forum member

Joined: Mar 2007
Posts: 1,163
Winona, MN
I need help identifying a rear quick detach hub from what I believe to be a BSA unit twin. The hub came with an A10 project bike (now sold) and I kept the hub, powder coated it and cadmium plated the hardware. I would like to sell it but need to know what it is in order to do so.

The hub:
has a 7" drum, 1 1/8" brake shoes, the drum has two flanges/ribs, no zerk fitting on the crinkle spindle, two 1640 bearings and a detachable chainwheel.
Take a look and if anyone could tell what is missing and/or post a correct parts list and diagram I would be grateful. Thanks!







1966 Triton
1962 BSA DBD34 Gold Star
1966 Triumph Bonneville
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Re: BSA QD rear hub ID please [Re: Swan] #412219
01/07/12 9:48 pm
01/07/12 9:48 pm
Joined: Sep 2001
Posts: 2,799
Comox BC Canada
G
Gordo in Comox Offline
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Gordo in Comox  Offline
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G

Joined: Sep 2001
Posts: 2,799
Comox BC Canada
Swan: If all those bits came from the same bike I would say they are from a B44 based on the chain tension bits, long spindle and the size of the stub axle. They are not A65. Strange how the speedo drive seems to be in two parts.

Gordo


Last edited by Gordo in Comox; 01/07/12 9:59 pm.

Without frequent roadside repairs there is no fun in riding!
Re: BSA QD rear hub ID please [Re: Swan] #412233
01/07/12 11:18 pm
01/07/12 11:18 pm
Joined: Mar 2007
Posts: 1,163
Winona, MN
Swan Offline OP

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Swan  Offline OP

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Posts: 1,163
Winona, MN
Thank you both. One key difference from my hub and Gordo's chart is that my chainwheel fits the drum from the left (primary) side on to a stepped area (second photo above) where as the the drawing indicates the chainwheel fits on the opposite right side (timing) of the drum.

I realize now I am missing the large rubber ring, some shims and bearing caps.

My first thought was this was A65 and reminded me of my 66 Lightning quick detach hub, particularly with the speedo drive mount and memories of a large felt washer.

I will wait to let others chime in.


1966 Triton
1962 BSA DBD34 Gold Star
1966 Triumph Bonneville
Re: BSA QD rear hub ID please [Re: Swan] #412244
01/08/12 12:12 am
01/08/12 12:12 am
Joined: Sep 2001
Posts: 2,799
Comox BC Canada
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Gordo in Comox Offline
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Joined: Sep 2001
Posts: 2,799
Comox BC Canada
Swan: The parts diagram is misleading. The chainwheel goes on the left side as per the photo below.

Of course the A65 and B44 share the crinkle hub and at times the alloy brake plate before the larger stub axle was introduced but only the B44 has that particular long spindle and the open ended swingarm for those chain tension things. If you look at a bare hub and speedo drive from a B44 and an A65 you will not see any difference. The felt washer you mention goes into both of them and is #48 in the above B44 diagram.

The brake drums are different to take different chain wheels but I would have to go and dig some out for the details.

Gordo



Without frequent roadside repairs there is no fun in riding!
Re: BSA QD rear hub ID please [Re: Swan] #412249
01/08/12 12:57 am
01/08/12 12:57 am
Joined: Aug 2004
Posts: 285
UK
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pachy Offline
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Joined: Aug 2004
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UK


B44 GP bolts on from back (fast trackside sprocket swops)
B44 "all other models" cooling fins added round the drum & left no room for sprocket & bolt head clearance & bolts on from the front.


Last edited by pachy; 01/08/12 5:21 am.
Re: BSA QD rear hub ID please [Re: Swan] #412254
01/08/12 1:26 am
01/08/12 1:26 am
Joined: Sep 2001
Posts: 2,799
Comox BC Canada
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Gordo in Comox Offline
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Joined: Sep 2001
Posts: 2,799
Comox BC Canada
Swan: I dug out some bits and it appears that your brake drum is as per this example. Note the flange for mounting the chainwheel is well in from the edge of the brake drum. This is a B44 drum.



This example is I believe a drum for an A65. The chainwheel mounting flange is much closer to the edge of the brake drum.



I have never really looked at the differences before but it appears that it is all about moving the chainwheel mounting flange for the B44 to the right to align with the drive sprocket on the gearbox. Everything else is the same. The B44 has a more narrow engine. That also explains why it is hard to use a large tire on the B44 and still keep the chain clear of the tire.

Gordo


Without frequent roadside repairs there is no fun in riding!
Re: BSA QD rear hub ID please [Re: Gordo in Comox] #412310
01/08/12 3:10 pm
01/08/12 3:10 pm
Joined: Mar 2007
Posts: 1,163
Winona, MN
Swan Offline OP

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Swan  Offline OP

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Joined: Mar 2007
Posts: 1,163
Winona, MN
Gordo thank you very much for the images! Can you check the height of the flange of drums you posted? The flange on my drum is .420" (27/64").

Allan, I will measure and post the dimensions for my spacers.



Before

Last edited by Swan; 01/08/12 10:44 pm.

1966 Triton
1962 BSA DBD34 Gold Star
1966 Triumph Bonneville
Re: BSA QD rear hub ID please [Re: Swan] #412408
01/08/12 11:46 pm
01/08/12 11:46 pm
Joined: Sep 2001
Posts: 2,799
Comox BC Canada
G
Gordo in Comox Offline
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Joined: Sep 2001
Posts: 2,799
Comox BC Canada
Swan: I get 0.423 inches on the Victor drum flange and 0.188 inches on the A65 drum.

Gordo


Without frequent roadside repairs there is no fun in riding!
Re: BSA QD rear hub ID please [Re: Swan] #412458
01/09/12 5:33 am
01/09/12 5:33 am
Joined: Mar 2007
Posts: 1,163
Winona, MN
Swan Offline OP

BritBike Forum member
Swan  Offline OP

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Joined: Mar 2007
Posts: 1,163
Winona, MN
Gordo, thank you again!
B44 Victor hub it is. I want to sell it and will list here on BB forum then go to e-bay.


1966 Triton
1962 BSA DBD34 Gold Star
1966 Triumph Bonneville
Re: BSA QD rear hub ID please [Re: Swan] #412464
01/09/12 6:12 am
01/09/12 6:12 am
Joined: Aug 2001
Posts: 1,799
Christchurch, NZ
Kevin (NZ). Offline
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Kevin (NZ).  Offline
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Joined: Aug 2001
Posts: 1,799
Christchurch, NZ
What a great thread. Thanks so much guys for all that info and photos.

I have seen something similar with the forks before, - a run-down on all the differences.

We could almost produce a auto-jumble guide... things like this could be a trap for the unwary.


Why, Y, Dash Y..



Re: BSA QD rear hub ID please [Re: Swan] #412480
01/09/12 8:39 am
01/09/12 8:39 am
Joined: Aug 2001
Posts: 1,893
Elko, Nevada USA
dave - NV Offline

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dave - NV  Offline

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Posts: 1,893
Elko, Nevada USA
Gents .. I've 'been down the road' a bit dealing with the BSA rear wheels. BSA built many bikes from the parts bins, however they also made subtle changes to some pieces that aren't imediately noticed.

For starters .. I've had a rear '10 bolt' brake drum on my much modified '59 Goldie 'special' for several years. It has a Victor bolt on 47T 520 sprocket, alu backing plate and brake hardware. I also use a modified Victor rear axle. BTW, were you aware the '62 Goldie Competition model was OEM with a 10 bolt sprocket?

FWIW ... It takes some lathe work to fit a Victor axle with the hex head vs the OEM GS axle with the 'tommy bar' holes. It's worth the effort seems to me to be able to use a 13/16" wrench/socket vs a bar.
The Victor axle has a larger diameter for a short ways near the head that needs to be cleaned off. Also the axle is about 1/8" too long and needs shortening.

I learned a few things when I was building up a Gold Star road racer for a friend using a variety of BSA pieces from his boxed 'stuff' collection. grrrr. We wanted to fit a bolt on sprocket to allow easier gearing changes at the races.
First off I discovered that A65 QC rear wheel hubs and brakes are subtley different than Victor or pre unit pieces even tho they look the same. The A65 parts are all slightly larger/beefier, including the hub splines. Also metric bearings are used vs the earlier bike's inch sizes. A possible fit with a lot of modifications, but why bother?

My latest hurrah is with my current project building an 'improved' roadster from my '62 Competition 'parts bike' I've had for years. On this GS I'm also fitting a '10 bolt' brake drum with a 520 sprocket to allow using a DID 'X Ring' chain.
Anyhow ... I want to fit a chromed steel backing plate to be a bit correct. The steel plate that came on this bike that was fitted to a 10 bolt drum is pretty abused. Not to worry as I have another 'nice' plate. But... this identical looking plate is slightly larger in diameter and just barely rubs on the sprocket bolt heads. Aarrgh, another subtle difference in parts that will require working around.

Possibly interesting to someone: I'm using a Victor splined hub on this bike even tho it has the threaded end for a speedo drive. A spun formed and polished SS Huber hub cover specially made for a snug fit over the smaller thread OD works nicely. Also a lighter weight turned down Huber bearing spacer is in the hub. And of course sealed bearings are used in the drum and hub.

Last edited by dave - NV; 01/09/12 8:46 am.

Dave - NV

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