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Speedo difference w/bigger tires?

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homer74

Speedo difference w/bigger tires?
« on: July 09, 2007, 08:13:04 PM »
How much would my speedo be off by with big ole 30's on it? was running puny stock wheels?
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Offline museboy07

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Re: Speedo difference w/bigger tires?
« Reply #1 on: July 09, 2007, 08:26:13 PM »
i got 29s on mine and speedo says 50 when im goin bout 54-55
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homer74

Re: Speedo difference w/bigger tires?
« Reply #2 on: July 09, 2007, 08:27:27 PM »
Thanks i kinda thought that but wasnt sure.
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450rydr

Re: Speedo difference w/bigger tires?
« Reply #3 on: July 09, 2007, 08:28:50 PM »
Yeah, mine's off 10%, so 30=33mph, 40=44mph, 50=55mph
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BigRedZuki

Re: Speedo difference w/bigger tires?
« Reply #4 on: July 09, 2007, 08:41:20 PM »
use a gear calculator

www.izook.com/gearcalc.htm
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Offline olija

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Re: Speedo difference w/bigger tires?
« Reply #5 on: July 09, 2007, 09:44:06 PM »
The formula is simple

Current tire size (29") / stock tire size (26") x speedometer reading

That is how far it is off
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97 Sidekick 4door 5 speed, 1.5 spacer lift, 2" body lift, CJ rims, locked rear, 31's, 4:1 low <SOLD>
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Offline Rhinoman

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Re: Speedo difference w/bigger tires?
« Reply #6 on: July 10, 2007, 11:18:15 AM »
If you have a GPS then you can recalibrate the speedo. This was covered on, IIRC, Zuwharrie recently and (again IIRC) is reproduced in ACK's FAQ.
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Offline muskegtracker

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Re: Speedo difference w/bigger tires?
« Reply #7 on: July 11, 2007, 12:20:30 PM »
I concur with 10% decrease in speed and odometer reading.
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Offline john1974

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Re: Speedo difference w/bigger tires?
« Reply #8 on: July 12, 2007, 10:19:25 AM »
3 speed auto + 5.12 gears + 31x10.5s = speedo dead on ;)

nice to have a speedo be back on after years of samurais, and other stuff being off.
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