tyre(tire) size calculator - Dodge Caliber SRT-4 Forums

sxt sport uk · 09-20-2006, 11:08 AM

i've found a uk website that gives you a tyre(tire) size calculator, you punch in the size you have just now and you new size and it'll tell you what your correct speed will be %
http://www.rochfordtyres.co.uk/tyrecalc.asp

KStryker · 09-20-2006, 03:07 PM

sweet, thanks for the info....even though I have no understanding as to what all those numbers refer to :P

sxt sport uk · 09-20-2006, 04:32 PM

Tyre Size to Compare

Current 215/55/18
New 235/45/19
Difference 0.06%
Speedo reads 70mph your actual speed will be mph 70.04

you put your current tire size along the top line the you try and work out what tire would be in the line below, and find the best percentage to reduce the speedo variance i.e. the example above woulb be the best for me if i wanted 19's on my cali
let me know if this is any help??

KStryker · 09-20-2006, 06:30 PM

Quote:

Originally Posted by sxt sport uk

Tyre Size to Compare

Current 215/55/18
New 235/45/19
Difference 0.06%
Speedo reads 70mph your actual speed will be mph 70.04

you put your current tire size along the top line the you try and work out what tire would be in the line below, and find the best percentage to reduce the speedo variance i.e. the example above woulb be the best for me if i wanted 19's on my cali
let me know if this is any help??

what the heck is the 215/55/18 <- i can see that this is the rim size

sxt sport uk · 09-21-2006, 09:47 AM

215/55/18

the 215 is the tire width
the 55 is the tire profile
18 is the alloy size

it is how it's done over here, thought i was the same over there, guess not.
if i had to phone up and order a tire over the phone all i would say was i need a 215/55/18

so if i want 19's, i would order 235/45/19
because the difference is only 0.06% of the original diameter.
so because the % is so close it would mean the actual speed is 70.04mph when your speedo reads 70mph

let me know if this is any clearer?

KStryker · 09-21-2006, 03:47 PM

ok i understand now...so what would 20s be...

lets say i ordered some tires over the phone...and i received em...will all 20" rims fit?

sxt sport uk · 09-22-2006, 04:28 AM

what is your current tire size?

KStryker · 09-22-2006, 10:36 AM

i got 17s stock, but very soon I will be upgrading to 20s TIS :P

09-20-2006, 11:08 AM	#1 (permalink)
sxt sport uk Member Join Date: Aug 2006 Location: Glasgow, Scotland Posts: 33	tyre(tire) size calculator i've found a uk website that gives you a tyre(tire) size calculator, you punch in the size you have just now and you new size and it'll tell you what your correct speed will be % http://www.rochfordtyres.co.uk/tyrecalc.asp __________________ I Grab Life By The Horns

09-20-2006, 03:07 PM	#2 (permalink)
KStryker Super Moderator Join Date: Aug 2006 Location: Stockbridge, GA Posts: 255	sweet, thanks for the info....even though I have no understanding as to what all those numbers refer to :P __________________ Project Shadow, DUB Edition, Moderator.

09-20-2006, 04:32 PM	#3 (permalink)
sxt sport uk Member Join Date: Aug 2006 Location: Glasgow, Scotland Posts: 33	Tyre Size to Compare Current 215/55/18 New 235/45/19 Difference 0.06% Speedo reads 70mph your actual speed will be mph 70.04 you put your current tire size along the top line the you try and work out what tire would be in the line below, and find the best percentage to reduce the speedo variance i.e. the example above woulb be the best for me if i wanted 19's on my cali let me know if this is any help?? __________________ I Grab Life By The Horns

09-21-2006, 09:47 AM	#5 (permalink)
sxt sport uk Member Join Date: Aug 2006 Location: Glasgow, Scotland Posts: 33	215/55/18 the 215 is the tire width the 55 is the tire profile 18 is the alloy size it is how it's done over here, thought i was the same over there, guess not. if i had to phone up and order a tire over the phone all i would say was i need a 215/55/18 so if i want 19's, i would order 235/45/19 because the difference is only 0.06% of the original diameter. so because the % is so close it would mean the actual speed is 70.04mph when your speedo reads 70mph let me know if this is any clearer? __________________ I Grab Life By The Horns Last edited by sxt sport uk : 09-21-2006 at 09:54 AM.

09-21-2006, 03:47 PM	#6 (permalink)
KStryker Super Moderator Join Date: Aug 2006 Location: Stockbridge, GA Posts: 255	ok i understand now...so what would 20s be... lets say i ordered some tires over the phone...and i received em...will all 20" rims fit? __________________ Project Shadow, DUB Edition, Moderator.

09-22-2006, 04:28 AM	#7 (permalink)
sxt sport uk Member Join Date: Aug 2006 Location: Glasgow, Scotland Posts: 33	what is your current tire size? __________________ I Grab Life By The Horns

09-22-2006, 10:36 AM	#8 (permalink)
KStryker Super Moderator Join Date: Aug 2006 Location: Stockbridge, GA Posts: 255	i got 17s stock, but very soon I will be upgrading to 20s TIS :P __________________ Project Shadow, DUB Edition, Moderator.

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