Ac speedo drive question

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Model T Ford Forum: Forum 2017: Ac speedo drive question
Top of pagePrevious messageNext messageBottom of page Link to this message  By Michael Duffy on Thursday, March 23, 2017 - 12:06 am:

For the AC speedo drive with 21" tires, how many teeth should the pinion gear have?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Thursday, March 23, 2017 - 01:10 am:

21 for the 21" and 20 for the 30". But using the 21 tooth on 30 inch wheels didn't put the speedometer off by that much.


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