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It's gonna depend on a few factors. For example, you can run as wide as a 8.5" rim with a Toyo T1S in a 225/45/17, and a 9" wide rim for a 225/40/18, because the lower profile can support a little extra width. Wider isn't always better, though. The recommended width for the 225/45/17 is 7.5", and 8" for the 225/40/18.

Other manufacturers could have different specs; best to double check with them.

You wouldn't want to go any wider than 8" on a CL9 anyways, gonna stick out past the fenders........
 

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I don't think that sounds right. In tire measurements, a 225/**/XX

225 represents the width of the tire

** represents the sidewall of the tire. The height of the sidewall is determined by the number, as it is a percentage of the width. For example, if ** = 40, it's 40% of 225, and so forth and so on.

XX represents the wheels size.

How a 225/40 will fit better on a 9 inch wheel vs a 225/45 is beyond me.
If you said a 235/40 fits better than a 225/40, I'd then agree with you. Maybe you got the numbers confused.

Either way, with a 225/40 series tire, I wouldn't go wider than an 8 inch wheel. That's just me though. :donno:
 

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cmf said:
I don't think that sounds right. In tire measurements, a 225/**/XX

225 represents the width of the tire

** represents the sidewall of the tire. The height of the sidewall is determined by the number, as it is a percentage of the width. For example, if ** = 40, it's 40% of 225, and so forth and so on.

XX represents the wheels size.

How a 225/40 will fit better on a 9 inch wheel vs a 225/45 is beyond me.
If you said a 235/40 fits better than a 225/40, I'd then agree with you. Maybe you got the numbers confused.

Either way, with a 225/40 series tire, I wouldn't go wider than an 8 inch wheel. That's just me though. :donno:
I'm only going by what Toyo recommends for the T1S.



The bold number represents the optimal wheel width, and then you've got your high and low parameters. For a 225/40/18, you could run a 9", although I wouldn't either. For the 225/45/17, 8.5" is the max. They don't make a 225/45/18, so we'll never know what the max is for that :D.....

I guess this was just a long winded way of saying we need more than 225/**/** to make a determination........
 

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i would say 225/4/18 ~
i like this comb .. :D
 

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gbrandt19 said:
they make 225/45/18 tires

check tire rack my friend
and they will fit on the tsx
No, you misunderstood my post. They don't make Toyo T1S in 225/45/18, so there's no way to know what Toyo recommends for that size. Every manufacturer is going to have their own set of of specs for their tires.

In any event, I've never seen a pic of a TSX with 225/45/18; I'm not really sure why anyone would choose it. It's bigger than stock by 1/2" or so, and while it wouldn't be major, it's going to slow your acceleration down a hair due to lengthening the gearing, as well as being heavier.

The Tire Rack recommends 215/45/18.
 

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