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Pages: 1 2 
How to understand TIRES & WHEELS! (Read 11348 times)
May 24th, 2003 at 6:47pm

yellowjacket   Offline
Global Moderator
Tacoma, WA

Gender: male
Posts: 19399
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Since there is some confusing on tires sizes (metric = inches)
for dummies like me, I found this helpful link:
http://www.1010tires.com/TireSizeCalculator.asp
( also from Paul )
http://www.miata.net/garage/tirecalc.html

For an example:
My old tires:
P245/60R15
are 26.5 inches overall diameter
9.65 inches wide
Old wheels were: 15x8


My new Tires/Wheels:
Tires= Rear: BF GoodRich Drag Radials 275 & Front: BF Goodrich 225
Wheels = Keystone Klassics 15x8 rears & 15x7 front

...
...
...
This has lowered my front end 1/2" & raised my rear 1"
My front tire is 1/2 narrower & rear tire is 1" wider
This will acheive the musclecar look I'm trying to acheive. Cheesy

How to put bigger tires on your Shark!
http://www.corvettefaq.com/c3/MoreBite.pdf

Wheel Tech info & tips:
http://www.rsracing.com/tech-wheel.html

RPM calculator
http://www.car-videos.com/tools/speedrpm.asp

http://www.csgnetwork.com/multirpmcalc.html

My finished results:
http://1-4u-computer-graphics.com/jacks-corvette2.htm
« Last Edit: Jan 31st, 2008 at 9:37pm by Maximus79 »  

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Reply #1 - Jan 31st, 2008 at 11:43am

Redwingvette   Offline
Top Gun Member
Red Vettes are the best
Waterford, Michigan

Gender: male
Posts: 718
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Not very sure what I am doing here but it seems my information does not match the Tire size calculator.
I have Goodyear ST's 225/60R15's on my car that measure 26 3/4in tall off the car with 30psi air, 26 1/2 on the car.
The calculator says they are only 25.62in. That is a big difference.
I was looking to go to 235's that are listed at 26.10in but if they are truely taller then i need to know just how much.
 

Brian
73 Coupe, Performer RPM Heads & intake
Holley carb
Crane Cam, Roller rockers
BTO 200-4R trans, 3.55 gear
F-body seatbelts,
Magnaflow Exhaust.
NCM Lifetime Member
http://www.cardomain.com/ride/565523
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Reply #2 - Feb 1st, 2008 at 12:55am

68-73   Offline
YaBB Administrator
NCRS Member 68,73,77 Corvettes
Newark,Delaware

Gender: male
Posts: 8554
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To really great correct tire measurments you should really go to tire rack & check the exact tire (make & size).  After selling quite a few tires  over the years I have noticed that  even though the sizes are the same on two different manufactures tires doesn't necessarly mean there measurments are the same. So check each manufactures size & you'll get accurate readings. These tire chrarts get you close but can never be dead on accurate. Also check the rev's per mile on different tires with the same size & you'll see differences which changes your speedometer readings.
Hope this helps.
Alan Smiley
 
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Reply #3 - Jun 6th, 2008 at 4:11am
SS396   Ex Member

 
Glad ya'll are talking about this.

I just bought 15 x 8 rally rims (4 each)

When they get here, I will need tires.

I thought 235/60/15

But I want the muscle car look

I am a very gotta see on the car to know, person

The local tire shops will order of course I pay for any changes

You guys have been doing this for a while, could you help with what you have seen and like with maybe a likes or dislikes on why.


Bill
 
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Reply #4 - Jun 6th, 2008 at 4:25am

68-73   Offline
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NCRS Member 68,73,77 Corvettes
Newark,Delaware

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Posts: 8554
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I have 7"rims in the front & run 255/60/15 in the rear I have 8" rims & run 275/60/15 with no spacers & regular trailing arms. I use firestone firehawk 500 which are rated the best in this size by tire rack & I agree .
 Alan Smiley
 
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Reply #5 - Jun 6th, 2008 at 5:14am
SS396   Ex Member

 
Will 8 inch rims in the front work without interference??
Please say yes, I have already bought them.
Was told corvette's cam with 8 inch Ralley rims originally.

That is a taller tire than I thought. Any particluar reason for that?

How much of offset does your vette show??

Bill
 
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Reply #6 - Jun 6th, 2008 at 5:42am

68-73   Offline
YaBB Administrator
NCRS Member 68,73,77 Corvettes
Newark,Delaware

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Posts: 8554
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Should be fine maybe rube a little if you turn the wheel all the way. 4" offset
Alan Smiley
« Last Edit: Jun 6th, 2008 at 5:43am by 68-73 »  
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Reply #7 - Jun 6th, 2008 at 6:56am
SS396   Ex Member

 
OK Thanks Alan

Bill
 
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Reply #8 - Jun 18th, 2008 at 8:21am
SS396   Ex Member

 
well I put the new rims and tires on my vette

rims 15 X 8 rally rims (chrome) w/caps and beauty rings

tires firehawk IDY 500 235/60/15 on front
     firehawk IDY 500 275/60/15 on rear

The look is great, nice rake (real sporty)
Handling in greatly improved, Now I know I need shocks

So far luv them.
Thanks for all the advise and comments.

Bill
 
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Reply #9 - Jun 18th, 2008 at 8:11pm

Maximus79   Offline
Top Gun Member
"If you come to a fork
in the road,take it!"
Skagit Co.,Washington State

Gender: male
Posts: 15021
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Quote:
well I put the new rims and tires on my vette

rims 15 X 8 rally rims (chrome) w/caps and beauty rings

tires firehawk IDY 500 235/60/15 on front
     firehawk IDY 500 275/60/15 on rear

The look is great, nice rake (real sporty)
Handling in greatly improved, Now I know I need shocks

So far luv them.
Thanks for all the advise and comments.

Bill
No clearance issues?
 

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Reply #10 - Jun 23rd, 2008 at 10:58am
SS396   Ex Member

 
No clearance issues at all

makes full turns lock to lock.

Thanks again for the help and advise.

Bill
 
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Reply #11 - Jul 26th, 2008 at 9:02am
steves74   Ex Member

 
Lots of good info here...thanks

What I am looking for is an tire conversion for the oldies....  like H70-15.
How do you convert that to the newer tire sizes?

thanks,  steve
 
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Reply #12 - Jul 26th, 2008 at 11:51am

Maximus79   Offline
Top Gun Member
"If you come to a fork
in the road,take it!"
Skagit Co.,Washington State

Gender: male
Posts: 15021
*****
 
Quote:
Lots of good info here...thanks

What I am looking for is an tire conversion for the oldies....  like H70-15.
How do you convert that to the newer tire sizes?

thanks,  steve

Does this help?  -> http://www.vintagecarconnection.com/vintage_tire_size_conversion_chart.htm ;  heres another-> http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=45 ;  ---   http://www.tirerack.com/tires/tiretech/45_conversionchart.html ;    -One more->> http://www.mopar1.us/tireconversion.html
« Last Edit: Jul 26th, 2008 at 11:55am by Maximus79 »  

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Reply #13 - Jul 26th, 2008 at 1:35pm
steves74   Ex Member

 
Smiley Thanks... Great Charts and great Information...... Grin

now I know  Roll Eyes
 
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Reply #14 - Jul 26th, 2008 at 4:55pm

Maximus79   Offline
Top Gun Member
"If you come to a fork
in the road,take it!"
Skagit Co.,Washington State

Gender: male
Posts: 15021
*****
 
Quote:
Smiley Thanks... Great Charts and great Information...... Grin

now I know  Roll Eyes

I didnt really have time to look.What size does yours compare to?
 

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