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Old 10-26-2002, 11:00 AM
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Post HELP!!! with tire sizes and such. i got a few ?s

i thought this might be the best place to put this topic. i have a lot of questions.

1. what is the difference between tub and minitub?

2.what do the #s in rim sizes mean? example: 15x8. i know the 15 means 15 " rims, but what is the 8? the tire width?

3. can someone explain the #s tire sizes come in.
example: 255 65 15(this is just a random #) i know again that 15 means 15 inch rim, but what do the rest mean?

4. what are the most popular sizes for street/strip applications?

5. how does backspacing work?

6.`which is better in your opinion? getting a different set of tires for the track, or just getting drag radials?


PLEASE help me out, i am tired of being ignorant when people are disscussing tire combinations. thanks
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Old 10-26-2002, 01:11 PM
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I would think that mini tubs are for semi- wide tires that don't require a narrowed rear end to keep them under the chasis. As far as rim size 15x8 = 15inch rims with and 8inch width. But as far as tire sizes 275/60/r15 =(width/aspect ratio of width(height)/rim size. Some people may disagree with this description, but I worked at a tire shop for 2 years. But with the old tire description system a tire's width was measured 50's,60's,70's etc. Every now and then I had to prove people wrong (Example: what's wider 205/50/r15 or 235/60/r15 ?
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Old 10-26-2002, 03:56 PM
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They went to the current sizing system (235/60/R15) when the tire manufactures went metric system. Before that they were letter and number designations (F70, G70, N50, etc.). If you had a 215/75R15 passenger tire and wanted to go a little wider but maintain about the same diameter you would go one size wider (70 series) and one size larger so you would have 225/70R15. If you used a 215/70R15 she would be wider but a bit shorter which is why you also change the first number. General rule of thumb is one up/one down keeps about same overall diameter. But weather it's the old system or the metric system generally a 50 series tire is wider than a 60 sereies which is wider than a 70 series if the first number (section width) is the same. The first number (section width) doesn't mean actual width because the aspect ratio number (60,50,etc.) determines how much of that first number is height versus width.

[ October 26, 2002: Message edited by: dmorris1200 ]</p>
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