Paterson speedo drive

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Allan
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Paterson speedo drive

Post by Allan » Sun Nov 17, 2019 6:34 pm

I recently discovered a Paterson speedo drive unit, with the brass two piece spiral drive gear, but it needs a new fibre pinion gear for the drive shaft. Are they available anywhere?

Allan from down under.


Les Schubert
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Re: Paterson speedo drive

Post by Les Schubert » Sun Nov 17, 2019 7:13 pm

There are a number of different ratios. I think I have the list. Depends on rear axle ratio and tire size


Dropacent
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Re: Patterson speedo drive

Post by Dropacent » Sun Nov 17, 2019 7:52 pm

I had a batch made about 15 years ago. About 25 if I remember, and thought I’d probably die with them. I think I sold the last one about a year ago. Yes, there are different sizes, but can’t imagine someone’s that anal to worry about 1 or 2 mph.


Les Schubert
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Re: Paterson speedo drive

Post by Les Schubert » Sun Nov 17, 2019 7:56 pm

Tim
So which version did you make? What material?


Dropacent
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Re: Patterson speedo drive

Post by Dropacent » Sun Nov 17, 2019 8:16 pm

Les, I had a NOS fiber gear copied originally. I found the list of ratios years later, and we had lucked out and made the gear for the late 21” balloon tires. I don’t remember the specs, but should be easy to find. Even tire diameters vary so much from tire to tire, and used or new. We used some vintage hard red fiber rod, and I think I have several feet of it left. I’d be glad to share if someone makes another batch. I’d guess nylon would work just as well, but that red fiber wears like iron. Let me know if I can help, tmorsher@icloud.com

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DanTreace
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Re: Paterson speedo drive

Post by DanTreace » Sun Nov 17, 2019 8:27 pm

Russ's book shows four Patterson drive fiber gears, 10,11,12,& 13 tooth.

But no ref. on what ratio for tire sizes or gearing other than these were made for T and TT.
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford


Dropacent
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Patterson speedo gear ratios

Post by Dropacent » Sun Nov 17, 2019 9:52 pm

Here is what I had. As I said, I didn’t have the chart until long after the fiber gears were made. Got lucky, but really, how much can it matter?
8426490D-70A6-4AE6-BD9D-25F8A3DFB19E.jpeg

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