Calculating tire size

skiwesser · 04-07-2002, 01:44 AM

Okay, A 225/50/16 tire should measure 24.858" using the formula
right?
I measured mine to be 24.125" .
What gives?
The tires are pep boys futura cheapos so maybe they're off but
I sorta doubt it, I would think quality standards on any tire manufacturer are pretty tight.
Which measurment do I use??

jondog9 · 04-07-2002, 02:05 AM

If you haven't already done so, you might try tirerack.com. They have all the spec's on every tire they sell. I did notice though, that their spec's and real world spec's can vary slightly. Depends on lots of things like tire pressure, tread wear, rim width, etc.
But I was able to decide on exactly what size tire I wanted when I was changing tire sizes for my other car.

lx mike · 04-07-2002, 08:23 AM

There will alway be a difference in what a tire measures and what it actually will measure. have to take in account the pressure and also did you measure it on the car or off??

skiwesser · 04-07-2002, 07:53 PM

well I did measure on the car, wasn't thinking about the wieght
of the car. But still thats almost 3/4".
I guess I'll go with my actual measurments

04-07-2002, 01:44 AM	#1
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	Calculating tire size Okay, A 225/50/16 tire should measure 24.858" using the formula right? I measured mine to be 24.125" . What gives? The tires are pep boys futura cheapos so maybe they're off but I sorta doubt it, I would think quality standards on any tire manufacturer are pretty tight. Which measurment do I use?? __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ

04-07-2002, 02:05 AM	#2
jondog9 Registered Member Join Date: Apr 2002 Location: Sacramento, CA Posts: 2	If you haven't already done so, you might try tirerack.com. They have all the spec's on every tire they sell. I did notice though, that their spec's and real world spec's can vary slightly. Depends on lots of things like tire pressure, tread wear, rim width, etc. But I was able to decide on exactly what size tire I wanted when I was changing tire sizes for my other car. __________________ John, fast car

04-07-2002, 08:23 AM	#3
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	There will alway be a difference in what a tire measures and what it actually will measure. have to take in account the pressure and also did you measure it on the car or off?? __________________ Rice Haters Club Member #101

04-07-2002, 07:53 PM	#4
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	well I did measure on the car, wasn't thinking about the wieght of the car. But still thats almost 3/4". I guess I'll go with my actual measurments __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ

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