Joules, you are right. The 4.22 is 38/9. I‘m looking into having a 3.77 manufactured here in Germany and need as many details as possible. I would very much appreciate if you can confirm your numbers. Does that mean only the crown changes from 39 to 34 teeth? Pinion remains the same? PM me if you want to convert your 3.77 into cash.

Thanks

Why have one manufactured? Surely it wouldn't be cost effective when they are readily available? I would expect the pinion shaft to have different pitch to match the 34 tooth crown wheel.

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