I'm not sure whats missing from the rear brake plate where the sppedo drive fits in. Its basically just a hole. I know that the drive itself is a a basic item that fits externally, but are there internal parts inside the hub/brake drum that I should know about
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Alloy full-width hub I take it?
The hole in the brake-plate that you mention should be threaded. The speedo drive gearbox screws into it and its position is set by a lock nut. Once fitted, there is a small gear which fits onto the input shaft to the speedo drive gearbox and is held in place with a split pin.
This gear engages in a ring gear concentric with the wheel spindle inside the hub.
The drive gearbox itself will take a bit of finding. Villiers Services do the gears detailed above.Colin Sparrow
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There is one on eBay at the moment without the gear. http://www.ebay.co.uk/itm/Vintage-Sm....c100011.m1850
Not sure it its long enough for the alloy full width hub, but OK for tin hub. Colin I thought that the hole in the alloy British Hub was a plain hole and the drive was secured by a nut each side
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Originally posted by MarkM View PostThanks folks, looks a tad expensive, may just stick with my £2.50 Ebay bicycle computer speedo or maybe make a dummy one from a Smiths speedo to incorporate my bicycle one
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Speedo Drive in Full Width Hub
Mark,
The speedo drive on my full width hub screws into a threaded hole in the backing plate with a single lock nut.
The length of the threaded part that fits into the hub is 5/8 inch.
The thread was an odd size. It looks like 23/32 inch dia x 26 TPI.
I machined up a threaded plug to fit the hole so I didn't risk damage to the speedo gearbox while using the bike for trials.
Hope this helps.
Regards,
Peter.
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Originally posted by John Wakefield View Post
Colin I thought that the hole in the alloy British Hub was a plain hole and the drive was secured by a nut each sideLast edited by Colin Sparrow; 31/08/2017, 08:18 PM.Colin Sparrow
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Originally posted by Colin Sparrow View PostDefinitely threaded. The brake plate being alloy and the thread being very fine must mean they'd be easy to strip. My TFS came with the hole plain (i.e. stripped) and no speedo. Picked up a better brake plate (with thread) from Paul at the AGM gathering. He had several others.
John, why do you always assume I don't know what I'm talking about? If I'm not sure, I don't post.
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