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TKB in SJC
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Posted: May 11, 2000, 2:57 PM
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Shane: Help in deciphering tire size numbers
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Can you explain what the different numbers mean on tire sizes. I know the last number is the wheel diameter. I suspect the first number before the slash is the width, (in mm?) What does the number after the slash mean? Is that the sidewall height? Is it a fixed value in mm or is it a percentage of some other parameter? Does a larger number after the slash mean a taller tire?I want to put on the widest and tallest 16" rear tire that will fit on 16 x 7, 40 mm offset rims. I don't know if you can answer that specifically since you don't know what rims but at least if I can understand what the numbers mean I can make an educated choice. I'm considering 245/45-16 vs. 245/50-16. Is 255 too wide for a 7" rim? Thanks, Todd ------------------
28F (auto),Inferno Red, power seat, speed control, touring group, side airbags
ordered 2/10, BX 3/7, D 4/7, KZ 4/28, KZM 5/3, ETA 5/17 to 6/14 (dealer says 2-4 weeks shipping)
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dingo
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Posted: May 11, 2000, 4:08 PM
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Shane: Help in deciphering tire size numbers
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I believe the number after the slash is the sidewall height expressed as a percentage of the width.The other numbers are correct. As to the rest - Shane? ------------------
 '01 Cruiser 27G +ABS +CD Cranple "D?" Status Jun? 2000 [This message has been edited by dingo (edited 05-11-2000).]
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Francis
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Posted: May 12, 2000, 6:34 AM
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Shane: Help in deciphering tire size numbers
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Todd,
The number are in (mm) millimeter, except for the rim size which is in inches (diameter).
so, a 245/45-16 = 245mm (wide at road contact) and the side wall is 45mm (high, varies on the manufacturer of the tire because some have the rim protectors) and is fitted on a 16in rim. 255 is definitely too wide for a 7" rim. i would suggest 7.5 or 8"
but for PT 255 is too wide any way.
right shane? I'm considering 245/45-16 vs. 245/50-16. Is 255 too wide for a 7" rim? Thanks, Todd
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Shane@tirerack
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Posted: May 12, 2000, 1:53 PM
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Shane: Help in deciphering tire size numbers
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What does 245/45-16 mean?245 is the section width of the tire from sidewall to sidewall in millimeters. 45 is % of 245mm, which represents the height of one sidewall 16 is the rim diameter in inches. A tire size is actually a formula to tell you the overall diameter of the tire. What I do is convert the MM into inches and go from there. To convert into inches you divide the first # by 25.4. You then multiply by 45% to find the height of one sidewall. You then multiply by 2 because there is a sidewall above the rim and one sidewall below the rim. You then add the 16 which is the rim diameter in inches. So it should look like this. 245mm/25.4 is 9.65"
9.65" X 45% is 4.34"
4.34" X 2 is 8.68"
8.68" + 16" is 24.68" So your overall diameter of the tire is 24.68" ------------------
Shane@tirerack.com
Performance Specialist
The Tire Rack
800 428 8355 ext 341
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