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Old 06-25-2017, 11:32 AM   #1
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Default Rear end gearing calculator

A few years back someone posted a link to a rear end gear calculator web site. You would select your motor, transmission, and gears. And then you could put in a MPH and it would tell you the RPM or vice versa.
I my speedo seems way off and I want to confirm. It would be nice to know if im going to get a speeding ticket or not.
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Old 06-25-2017, 04:00 PM   #2
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Old 06-26-2017, 07:39 AM   #3
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If you have a smart phone, download a speedometer app. GPS is accurate enough at constant speed.
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Old 06-26-2017, 11:48 AM   #4
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i like this calculator: Gear Ratio Speed Calculator
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Old 07-08-2017, 04:20 PM   #5
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I whipped this up for ya... Assuming you have a T56.
Attached Files
File Type: xls MPH vs RPM.xls (29.0 KB, 24 views)
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Old 07-10-2017, 01:24 PM   #6
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The Flyin Miata website that has one that works for factory Miata rear ends and also has choices for V8 swap specifics.
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Old 08-11-2017, 05:40 PM   #7
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In my area, there are numerous speed limit signs with a radar display below the sign showing your speed. San Antonio must be more relaxed. :-)
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