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Old 03-11-2005, 10:27 PM
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Tire size for torq thrust II's

I am looking at buying a set of American Racing Torq Thrust II's. The rim size is 17"x8". They are to go on my 1967 Chevelle. The only problem is, well, I am illiterate when it comes to tire sizes. I have no idea what tire size i will need, and this makes buying tires rather difficult. I want sidewall, not too much though. Maybe like 2"-3" of sidewall, but I don't know what this means in tire terms. Any help would be greatly appreciated.

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Old 03-12-2005, 05:42 AM
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On 17 X 8"'s probably something like a 255 40 17 would be about as wide as I'd think you could use (255 is the width) on a 8" wheel without the sidewall bulging some. Here's a pretty good link, maybe it'll help you sort it out.

Passenger Tire Sizes
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Old 03-12-2005, 01:55 PM
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255 may be too wide for your rear unless the fenders have enough room. 40 series sounds good and of course 17in rims are nice
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Old 03-13-2005, 11:21 AM
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i still cant figure this out, maybe im retarded, but i just cant figure it out. I want relativly low profiles, but i just dont know. I have found a set of 245/40/RW17's, and i cant figure if these will fit. I think that they will fit, but I'm really not sure. They are made by Sumitomo, and they have a high performance summer tread. Any information would be greatly appreciated.
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Old 03-13-2005, 12:21 PM
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Well you could always buy the rims to fit with the tires.. like take your car to a shop and ask them to do some measuring and see if the rubber can fit in the wheel well, and they can tell you what rim or rim sizes will fit just be careful cause lots of stores are sticklers for bringing back rims in perfect condition if you are trying to return them. If you can get your tire to fit in there then you'll more then likely be able to get a rim with proper backspacing or what ever to fit.

good luck
bill
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Old 03-13-2005, 01:07 PM
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thanks for the help, that's what i'll do. It's always better to be safe than sorry. Thanks for the posts.
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Old 03-13-2005, 06:55 PM
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The number 245 is the width of the tire in millimeters, therefore the tire you are considering may have a tread width of 245mm. I say "may" because most tires have different widths even though they have the same size on the sidewall. Tread shape has a lot to do with it so does sidewall thickness, you should compare tires in person with your rims to see how they might look.

The number 40 refers to the height of the sidewall as a percentage of the tread width, therefore 40% of 245 is 102mm approximately. This figure is an approximation and varies from tire to tire manufacturer but is used for comparison. Your tires height is directly dependant on this figure.

The last number "17" if the diameter of the rim your tire fits...duh.

As you can see your 245mm wide tire is wider than your rim, 8 inch wide rim = 205mm approximately. You have to decide if an extra 7/8" of an inch hanging outside your rims is desirable aesthetically. Functionally it is not good but isn't really dangerous, sidewall flex will cause sloppy handling and a mushy ride.

Ideally you want a tire the same width as your rim, a 205-225mm wide tire might be a better choice for the car. Of course all this is up to you and how much room there is in your wheelwells, I suggest you look carefully at what you want to put on the car and how it will look and perform, tires too wide for the rim look kinda dumb (although quite fashionable at one time ) and handle real crappy even with low profile rubber.

A tire the proper width for the rim looks better, lasts longer because of less heat buildup in the carcass and handles crisper, be careful and don't go overboard with width.
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