from 27's to 30's///speedo
#1
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?
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?
#5
#6
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...
#8
#11
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
http://www.miata.net/garage/tirecalcold.html
#13
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
http://www.miata.net/garage/tirecalcold.html
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...
#14
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...
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:
Originally Posted by 4X2XLT
so whats the best way to get the speedo corrected? how much is it?
so i was just answering him
#15
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.
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.
#16
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
just take it to ford and have them recalibrate it to the nearest size they can
ill probably just stick to about 5 over which should equal out to about 8-9 over most of the time....
#17
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