from 27's to 30's///speedo - Ranger-Forums - The Ultimate Ford Ranger Resource


Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
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Old 01-24-2006
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from 27's to 30's///speedo

i didnt want to hijack the other thread....

im gunna put on some 30's in like late may/june, and im going from 225/70/15 to 30/9.5/15, and as someone mentioned 31's is a 15% increase in size and my speedo would be off by 12%...

so whats the best way to get the speedo corrected? how much is it?
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Old 01-24-2006
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i think its made by superlift. it corrects ur speedo ive seen it on ebay for pretty cheap.
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Old 01-24-2006
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You should be able to have it changed in the computer.. without the tru speed calibrator
from superlift...
Mine came stock with bigger tires than that.
Rand
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Old 01-24-2006
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how would i go about accesssing the computer and recalibrating it?
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Old 05-20-2006
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ok well my tires are coming in on monday so anyone know of a cheap way to redo it? or should i just ilve with it, and if i get a ticket, try to fight it saying that my speedos off from the tire size and kill two birds with one stone...
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Old 05-20-2006
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Quote:
Originally Posted by 4X2XLT
ok well my tires are coming in on monday so anyone know of a cheap way to redo it? or should i just ilve with it, and if i get a ticket, try to fight it saying that my speedos off from the tire size and kill two birds with one stone...
You don't get out of speeding tickets with equipment violations anymore except in rare cases. When I worked for Ford I changed my tire size myself with the WDS but I don't know how much it would cost you to have them do that for you. Probably 1 hour of labor.
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Old 05-20-2006
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just live with it, that superlift thing is well over 100$. I can tell how fast im going by the sound of my tires
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Old 05-20-2006
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Just figure you're going 10% faster than you actually are. It's easy enough to figure.

Also, if you compute your gas mileage, figure you're getting 10% more.

Nice round figure. Actual percentage is slightly less, but not worth worrying about.
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Old 05-20-2006
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what kind of tires are u gettinga anyways
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Old 05-20-2006
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Old 05-20-2006
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use this to get your correct speed and adjust to it till you get a fix for it
http://www.miata.net/garage/tirecalcold.html
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Old 05-20-2006
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Quote:
Originally Posted by 4X2XLT

your getting that in a 30?


just take it to ford and have them recalibrate it to the nearest size they can
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Old 05-20-2006
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Originally Posted by garebel
use this to get your correct speed and adjust to it till you get a fix for it
http://www.miata.net/garage/tirecalcold.html
Why would he go to all that trouble? It's so close to 10 percent there's no need for an exact calculation, lol.

His speed is 30/27 times what it says with new tires on, or 1.11 times what his speedo reads.

If he reads 55 mph, that's 55 x 1.11 = 61.05 mph

If he uses a 10% he can just say, "Speedo says fifty-five, 10% is five and a half, fifty five plus five and a half equals about 61 mph".

Using 10 percent is so close, there's really no need to get out a calculator.

I'm hoping most of you have at least that much mastery of mathematics, lol...
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Old 05-20-2006
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Quote:
Originally Posted by n3elz
Why would he go to all that trouble? It's so close to 10 percent there's no need for an exact calculation, lol.

His speed is 30/27 times what it says with new tires on, or 1.11 times what his speedo reads.

If he reads 55 mph, that's 55 x 1.11 = 61.05 mph

If he uses a 10% he can just say, "Speedo says fifty-five, 10% is five and a half, fifty five plus five and a half equals about 61 mph".

Using 10 percent is so close, there's really no need to get out a calculator.

I'm hoping most of you have at least that much mastery of mathematics, lol...

personally i wouldnt do anything about it, but he did say:

Quote:
Originally Posted by 4X2XLT
so whats the best way to get the speedo corrected? how much is it?

so i was just answering him
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Old 05-21-2006
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S'okay -- I wasn't talking to you, I was talking to "garebel" who posted the tire calculator. It's a pet-peeve of mine: people reaching for computerized tools for simple problems, lol.

If he wants to get it corrected, then of course it's a dealer or programmer thing. I wasn't disagreeing with that.

And mine's in the range of 8% after gear and tire changes -- but I'm not concerned enough to program in a correction. I also just use 10% and figure it in my head.

I've gotten one speeding ticket but that's because I was deliberately speeding, not because I didn't know the speed, lol. Actually the officer gave me a ticket for something like "unsafe speed for conditions" which was a lesser ticket with no points, so I actually got off easy.
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Old 05-21-2006
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Quote:
Originally Posted by Gay-briel
your getting that in a 30?


just take it to ford and have them recalibrate it to the nearest size they can
lol i know its gunna look funny, but i wanted something bigger but in an all season...

ill probably just stick to about 5 over which should equal out to about 8-9 over most of the time....
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  #17  
Old 05-21-2006
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Quote:
Originally Posted by n3elz
It's a pet-peeve of mine: people reaching for computerized tools for simple problems, lol.
i don't give a **** about your pet peeves, i was not talking to you.
also, it was a temporary thing so not getting a ticket until he was able to get it fixed and/or not.
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  #18  
Old 05-21-2006
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Quote:
Originally Posted by 4X2XLT
lol i know its gunna look funny, but i wanted something bigger but in an all season...

ill probably just stick to about 5 over which should equal out to about 8-9 over most of the time....

bfg a/t
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