The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: Greybeard on 13.06. 2015 14:32
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In my box of bits I have a quick release type hub different from my '55 A10. Can you tell me what it's for?
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If the splines are the same as A10 then its from a rigid. If the splines are different its Triumph.
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Thanks Andrew,
The splines are different to my A10 so I guess it's a Triumph.
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A rigid what, Andrew?
A7/10 rigid hubs are the same as '54/5 swinging arm hubs.
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So, definately not that.
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I was actually thinking B31. My mate has a 1947 and it looks very similar to that, with cup and cone bearings. Apologies for the confusion. However, it turns out to be non-BSA, probably Triumph.
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Hi All,
I cannot id the hub,
But I know the postwar B31's(up to 49?) and so on have a one piece hub with integral brake drum and sprocket
They have taper roller bearings
Without serious engineering facilities the sprocket on these cannot be replaced *sad2*
So rebuilding the wheel with a new (if you can find one) hub is the only solution
What a dozy idea *problem* *problem* *problem*
John
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Here are some pics of a 1950 rigid b31 hub.....the bare hub in the pics has the drum riveted to the hub which was how it was done originally, the hub spoked in to a wheel has been modified to have a bolted on drum/sprocket, the drum is a bsa one maybe an a65.
The bare hub has a 46 tooth sprocket ring newly welded on, the original 42 tooth was machined off first, I doubt it is possibly to weld on a new 42 tooth ring sprocket as there would be hardly any strength in a ring of 42 teeth. The drum needed skimming after the welding job, as it was slightly distorted by the welding despite the best efforts of my machinest guy.
Hopefully if I ever have to renew a 46 tooth sprocket part of the ring can be left on the drum to prevent it distorting again. That was also why I did not opt for a 44 tooth ring ....which could have been used.... just about. The 46 tooth ring was made from a solid blank sprocket.
It is true new hubs are hard to find! And knackered ones tricky to refurbish. The difficulties with renewing the sprockets might be why rigid b31s are a bit rarer? *conf*
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HI Kiwi,
Nice mod,
As I said serious engineering required *work* *work*
John
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I decided to Ebay that hub:
http://www.ebay.co.uk/itm/231611764332?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
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Therealolddog with a greybeard *smile* And you need to update your photo *whistle*
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Therealolddog with a greybeard *smile* And you need to update your photo *whistle*
Which photo Musky?
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Ebay
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Oh yes, my beard wasn't totally gray then! That photo was taken in the London Eye