Quetsion: Widest Wheels for the 05 - Pontiac GTO Forum
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post #1 of 20 (permalink) Old 11-22-2005, 12:08 PM Thread Starter
 
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Quetsion: Widest Wheels for the 05

Can anyone tell me the widest wheel that will fit on the 05 goat. I want to get some wide 18s or 19s to do the auto cross next spring.
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post #2 of 20 (permalink) Old 11-22-2005, 12:11 PM
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sure thing, 19x9 will fit on the rear, MTI says so.
post #3 of 20 (permalink) Old 11-22-2005, 12:14 PM
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tell me what number on teh tire tells u the width of the tire and how tall ie 245/45/r17 i want wider tires not taller
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post #4 of 20 (permalink) Old 11-22-2005, 12:18 PM
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ok, here ya go

245 - width in millimeters of the tread itself, not actually the tire
45 - aspect ratio of the tire. So this tire is 45% of 245mm in height
17 - diameter of the wheel your mounting the tire to.

Here is some trick math for ya.

245-45-17 is the same height as a 255-40-17 or a 245-35-18.

When staying with the same rim, when you increase width by 10, decrease your aspect ratio by 5. When changing rims, also known as plus sizing, for every increase in rim size, you want to decrease your aspect ratio by 10.

This will keep the overall diameter roughly the same.
post #5 of 20 (permalink) Old 11-22-2005, 12:20 PM
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so if i want the tire a bit wider raise or decrese the mid num?
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post #6 of 20 (permalink) Old 11-22-2005, 12:21 PM
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say your a 245-45-17 and you want more width. you have these to choose from.

255-40-17
265-35-17
275-40-17
285-35-17
315-35-17
335-30-17
post #7 of 20 (permalink) Old 11-22-2005, 11:00 PM
 
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ok so i can go with 275/40/17 on the rears on the 05 with out rolling the edge?
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post #8 of 20 (permalink) Old 11-22-2005, 11:10 PM
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Quote:
Originally Posted by 05 goatman
ok so i can go with 275/40/17 on the rears on the 05 with out rolling the edge?
good question. well mike? what are the tires on the 05-06 vett thats how wide i want mine. thoughts plz
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post #9 of 20 (permalink) Old 11-23-2005, 06:04 AM Thread Starter
 
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I, too would like to have my wheels and Tires as wide as the vettes.
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post #10 of 20 (permalink) Old 11-23-2005, 07:01 AM
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Quote:
Originally Posted by EEZ GOAT
good question. well mike? what are the tires on the 05-06 vett thats how wide i want mine. thoughts plz
2006 Corvette is as follows, 05 was the same.

245/40ZR18.0 on an 18x8.5 rim
285/35ZR19.0 on a 19x10 rim
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