Got some new Vette/ZO6 Chrome Wheels 18X9 at a steal, does anyone know what my limitations are in tire sizes. Don't do any off roading just daily driving. Worried about rubbing etc. Don't know much about tire sizing but I couldn't pass up the deal on the rims would like the back tires alittle wider than the front but maintain overall height as close a possible. Just a cruiser truck, any info appreciated.
SEAYAHAWAII@hawaii.rr.com
thanks
Wheels and Tires
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HenryJ
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The main concern will be rubbing the back of the front fender.
With the stock tires and wheels still on , I'd park with one front tire up on a curb, the turn the wheel to where it is closest to the back fender. Use a white crayon, welders pencil or something to make a mark on the tires sidewall 1" from the edge of the rim. (this is about where the bead would be on the 18" rim) Lay a yard stick across the tires side wall and measure from your mark to the closest point on the fender. You may have to have someone turn the wheel to get it to a point where everything lines up.
Ok, now you have the maximum size of the space available, and by measuring from the sidewall of the narrower tires , you have approximated the corner of the wider tire at the closest point. Take that measurement and subtract 1" for clearance, and you have the maximum sidewall.
Now if you understand how the tire sizing works you can calculate the size tire you want.
Example:
9" rim and want 9" tread width for the front . 235 (mm) comes to 9.25 inches so that size is pretty close, next we need to find which profile would give us the diameter we want.
Let's say that your measurement above was 7" minus 1" for clearance, equals 6" total sidewall. All we need now is what percentage of 9.25" comes the closest without exceeding 6".
5.55" is 60% of 9.25", So a 235-60R18 should work.
Now that the tire size has been calculated for the front what is the diameter? The sidewall is 60% of the tread width right? 5.55"
So, 5.55"+18"+5.55"=29.1"
Now since it is a 4x4 and we want a wider tire on the rear we will have to stay with that 5.5" side wall, so we figure from the reverse what percentage and tread width with a 5.55" (140mm) sidewall?
Let's try some 50's and see how wide it would be. (5.5") 140mm = 50% of 280mm which is an 11" wide tire. That might work? 280-50R18 but is that size available? 255-55R18 is the same diameter and a 315-45R18 is pretty close too.
Once you know what the max. for the front is you can play around with sizes to find the combination you want.
The calculators on the Crew Cab website are pretty handy for some quick calculations.
The problem lies in what tire sizes are common and affordable you may have to adjust down a bit to find the right combination.
With the stock tires and wheels still on , I'd park with one front tire up on a curb, the turn the wheel to where it is closest to the back fender. Use a white crayon, welders pencil or something to make a mark on the tires sidewall 1" from the edge of the rim. (this is about where the bead would be on the 18" rim) Lay a yard stick across the tires side wall and measure from your mark to the closest point on the fender. You may have to have someone turn the wheel to get it to a point where everything lines up.
Ok, now you have the maximum size of the space available, and by measuring from the sidewall of the narrower tires , you have approximated the corner of the wider tire at the closest point. Take that measurement and subtract 1" for clearance, and you have the maximum sidewall.
Now if you understand how the tire sizing works you can calculate the size tire you want.
Example:
9" rim and want 9" tread width for the front . 235 (mm) comes to 9.25 inches so that size is pretty close, next we need to find which profile would give us the diameter we want.
Let's say that your measurement above was 7" minus 1" for clearance, equals 6" total sidewall. All we need now is what percentage of 9.25" comes the closest without exceeding 6".
5.55" is 60% of 9.25", So a 235-60R18 should work.
Now that the tire size has been calculated for the front what is the diameter? The sidewall is 60% of the tread width right? 5.55"
So, 5.55"+18"+5.55"=29.1"
Now since it is a 4x4 and we want a wider tire on the rear we will have to stay with that 5.5" side wall, so we figure from the reverse what percentage and tread width with a 5.55" (140mm) sidewall?
Let's try some 50's and see how wide it would be. (5.5") 140mm = 50% of 280mm which is an 11" wide tire. That might work? 280-50R18 but is that size available? 255-55R18 is the same diameter and a 315-45R18 is pretty close too.
Once you know what the max. for the front is you can play around with sizes to find the combination you want.
The calculators on the Crew Cab website are pretty handy for some quick calculations.
The problem lies in what tire sizes are common and affordable you may have to adjust down a bit to find the right combination.
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snowsurfer
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tires
Henry,
Haven't quite figure out all of the calculations you put out but I want to thank you for all the usefull information and help. I will definitely try to figure out what I can use, thanks again.
Steve
Haven't quite figure out all of the calculations you put out but I want to thank you for all the usefull information and help. I will definitely try to figure out what I can use, thanks again.
Steve
