whats my tire circumference ??

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whats my tire circumference ??

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Mustang Forums >> Ford Mustang Tech >> 2005 - 2008 Mustangs >> 4.0L V6 Specific >> Handling Performance >> whats my tire circumference ??

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whats my tire circumference ?? - 3/8/2008 3:50:25 PM

07gttom

Posts: 41
Joined: 10/20/2007
Status: offline

whan i get my whipple, i will have to send away for my pro cal tool. it asks for the tire circumference. i have no clue what it is, does anybody else know. i am running the stock rims and tires (i think they are 235/55/17's...??) i want to make sure i get the right circumference, does anybody know, or is there a calculator online that does it?
thanks

Post #: 1

RE: whats my tire circumference ?? - 3/8/2008 3:53:46 PM

wingman75

Posts: 2651
Joined: 6/26/2006
Status: offline

This link is from a Miata site but that doesn't matter for tires.

http://www.miata.net/garage/tirecalc.html

EDIT: you have the correct stock size by the way.

< Message edited by wingman75 -- 3/8/2008 3:58:40 PM >

_____________________________

2007 GT, CDC Ducktail & Chin, SHR 1/4 Louvers, BSM Stripes
GMS CAI, Xcal2, Lidio''''''''s 93 Tune, 3.73 Gears, Spydershaft
MAC Boomtubes, DD Bullitts/Goodyear

(in reply to 07gttom)

Post #: 2

RE: whats my tire circumference ?? - 3/8/2008 6:56:43 PM

CataclysmGT

Posts: 980
Joined: 7/24/2007
Status: offline

Don't remember basic math? Use a tape measure....
Diameter x 3.14

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07 GT
FRPP/Borla Stingers,
Roush Suspension & Billet LCA's
Saleen Black 20's
*Whipple Crew Member*

(in reply to wingman75)

Post #: 3

RE: whats my tire circumference ?? - 3/8/2008 7:12:10 PM

mhconley

Posts: 320
Joined: 12/28/2007
From: Discovery Bay, CA
Status: offline

Even better yet - use the rim/tire size:

diameter = (235mm/25.4mm/in x 55% x 2) + 17in = 27.18in
^^^ ^^ ^^
tire width aspect ratio rim diameter

circumference = diameter * pi = 27.18in x pi = 85.38in

Martin

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Post #: 4

RE: whats my tire circumference ?? - 3/8/2008 7:29:31 PM

Stkjock

Posts: 3079
Joined: 1/18/2007
Status: offline

math geeks FTW!

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Tngstn 06GT-5 spd -Vortech HO S/C-Tuned by Realspeed Auto

You can never have too much power, just not enough traction.
12.33 @ 112.3 - 1.71 60"

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Post #: 5

RE: whats my tire circumference ?? - 3/8/2008 7:45:10 PM

F1Fan

Posts: 1281
Joined: 3/10/2005
Status: offline

quote:

ORIGINAL: 07gttom

whan i get my whipple, i will have to send away for my pro cal tool. it asks for the tire circumference. i have no clue what it is, does anybody else know. i am running the stock rims and tires (i think they are 235/55/17's...??) i want to make sure i get the right circumference, does anybody know, or is there a calculator online that does it?
thanks

Hi 07gttom,

Stop guessing! Go out to your garage of a large flat area and bring a roll of blue masking tape and a tape measure. Stick a piece of tape on the ground and on your tire aligned with each other in the same place. Roll the car until the the tape makes one revolution and put another piece of blue tape on the ground. Measure from one mark to the other and you will have the exact circumference of the tire you measured withoug any guesswork or even simple math. This is how you measure tire roll out.

HTH!

_____________________________

2005 Mineral Grey Mustang GT Coupe, Premium, M5, ICAP, IUP, Active Anti-theft, LoJack

Mods: Gave up trying to make it all fit, but ask if interested!

(in reply to 07gttom)

Post #: 6

RE: whats my tire circumference ?? - 3/8/2008 7:47:25 PM

Nuke

Posts: 1976
Joined: 6/3/2007
Status: offline

Or go to tirerack.com or the tire manufacturers website and get the tire specs.

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Rick

07 GT Prem, Alloy, MT, 3.55s, Steeda CAI/Xcal2 w/Brenspeed tunes, 14" shorty, 275/40/18 Goodyear Eagle F1 Allseasons on SVT 2007 Cobras, FRPP Stingers

(in reply to F1Fan)

Post #: 7

RE: whats my tire circumference ?? - 3/8/2008 8:06:27 PM

07gttom

Posts: 41
Joined: 10/20/2007
Status: offline

hey thanks for the replies!!

(in reply to Nuke)

Post #: 8

RE: whats my tire circumference ?? - 3/8/2008 10:30:55 PM

F1Fan

Posts: 1281
Joined: 3/10/2005
Status: offline

quote:

ORIGINAL: Nuke

Or go to tirerack.com or the tire manufacturers website and get the tire specs.

Hi Nuke,

Still guessing, nothing is more accurate than measuring your own tires on your own wheels. Tire Rack is a good resource as a guide but they use the manufactures specs.

HTH!

_____________________________

2005 Mineral Grey Mustang GT Coupe, Premium, M5, ICAP, IUP, Active Anti-theft, LoJack

Mods: Gave up trying to make it all fit, but ask if interested!

(in reply to Nuke)

Post #: 9

RE: whats my tire circumference ?? - 3/8/2008 10:44:27 PM

CataclysmGT

Posts: 980
Joined: 7/24/2007
Status: offline

I still say measured diameter x 3.14

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07 GT
FRPP/Borla Stingers,
Roush Suspension & Billet LCA's
Saleen Black 20's
*Whipple Crew Member*

(in reply to F1Fan)

Post #: 10

RE: whats my tire circumference ?? - 3/9/2008 3:48:06 AM

moosestang

Posts: 7095
Joined: 9/3/2006
From: Gainesville, FL
Status: offline

It doesn't matter because the speedometer in these cars is inaccurate as all hell! The computer sends the correct speed, but the needle just can't seem to display it correctly. My aeroforce gauge shows a 3mph slower speed than the speedo and I confirmed this with gps and my wifes car.

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whipple HO SC,FRPP springs, Pypes mid mufflers, Che adj. LCA, hurst, 4.10's, 1 piece DS, spec stg 2 clutch. Accel coils 12.52@117.6mph so far with a 2.01 60 ft time(pre shaft, coils, clutch).

(in reply to CataclysmGT)

Post #: 11