1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

17 inch rims odometer

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Old Dec 5, 2018 | 06:29 PM
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rx7junkie170's Avatar
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17 inch rims odometer

I have 17 inch rims and my odometer reads hella fast I want to keep track of miles driven for oil changes is there any way I can calculate or recalibrate the odometer I was thinking putting it on 0 then track on my phone how many
milwa will it give to one correct mile and then add that up I would like for it to work as it should
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Old Dec 5, 2018 | 07:33 PM
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There are no adjustments internal to the odometer. It's a mechanical gear train from the speedo cable which drives the odo; the rotation ratio is fixed.

You used to be able to buy different-sized drive gears for the trans end of the speedo cable, but that was a long time ago.
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Old Dec 5, 2018 | 07:47 PM
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What size tires are you running on those 17" rims. Aspect ratio of tire sidewall can have a large effect on final drive gearing.
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Old Dec 5, 2018 | 07:48 PM
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I believe these are your options.

1. Get a mechanical ratio device. This is based on percentage that you are off.
2 Use an electrical pulse driven unit.

https://www.bobsspeedometer.com/1/120/ratio_adapter.asp
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Old Dec 7, 2018 | 10:26 PM
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225/35R-17 tires are the exact same diameter as the factory rubber (23.2") and your speedo/odo should read true. If those are too wide for your wheels's offset 205/40 and 195/40 are very close.
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Old Dec 11, 2018 | 09:49 AM
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Click on the link below, plug-in old tire/wheel specs on the left and on the right plug-in what your are currently running. The chart below your current configuration will give you various clearances and what the change in speedometer readings will be will the larger tire.rim setup.

Custom rims, wheel tire packages
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Old Dec 24, 2018 | 10:46 AM
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Thanks i wil check the size of the tires when i go to my garagei think there 250ws if im sure
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