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Discussion Starter #1
I have 235-55-16s on my car w/51k miles on them (goodyear eagle HP). I can get goodyear eagle gt-hr 235-55-16 for $94/ea. or 225-60-16 for $92/ea at discount tire. The guy at DT said that 235-55 are non OEM and I should run the 225-60-16 Which size would you get?
 

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Get them in 225-60/16. The other size is too far from the stock diameter, thus messing up your speedo.

-Joel
 

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Using this tire size comparer I found that a

225/60-16 is 26.62" overall diameter and 8.85" section width with a 6 - 9" rim allowed. Section width would vary with rim width.

235/55-16 is 26.17" overall diameter and 9.25" section width with a 6.5-8.5" rim allowed. Section width would vary with rim width.

That's a 1.727% change, the shorter 235/55-16 spinning 794.8 revs per mile while the taller 225/60-16 spins only 781.3 revs per mile.

If the car's speedometer is dead on accurate at 60 mph with stock size 225/60-16 tires, it'll have to read 61.03 mph (call it 61) with the shorter 235/55-16s to travel down the road at a true speed of 60 mph.

Your talking about less than 1/2 inch (0.45 inch) reduction in overall diameter. Put another way, the 235/55-16 tires start out with new tread at near the same overall diameter as the 225/60-16s will be when nearly worn out.

Taller tires look better in these fenders IMHO. The 225/60-16 is an easier size to find if traveling and you suffer a blowout and find you need to purchase one.

The slightly narrower tread of the 225/60-16 will likely be a hair less suceptable to hydroplaning in heavy rains than a wider 235/55-16 tire.

The narrower tire's tread being narrower, will suffer slightly less wear from scuffing in tight parking lot turns and day to day driving, all else being equal.

But, the diameter is nearly the same, and the wider 235/55-16 tire would look great on the Tbird.

If just a play car or strictly local driver, I might go with the wider 235/55-16 tire especially if I had just finished 51,000 miles on a set.

Knowing that I may take it on a trip, etc, I myself, would probably go with the slightly narrower and taller 225/60-16 tire probably, if for no other reason but that it's more common and easier to find if on a trip.

Clear as mud huh? :D
 

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I have found that with the 225 60 16 the speedometer is off from the factory by about 1 or so mph. I run 235 60 16's on everything that I had with 16" wheels and the speedometer was dead on (checked via radar and mile markers). And I think that size looked good. The last thing these cars need are shorter tires. :D

Just my .02. :thumbsup:
 

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I run the 235/55R16's on my car and love the fit on my stock Sport wheels with the Tokico drop. If your car is lowered, they'll look great. They look a good bit wider than the 225/60R16 and look great from the rear. Not too wide, not too skinny (like the 225/60R16's look on our cars). If your car isn't lowered, then stay away from anything smaller than in diameter than a 225/60R16.

My speedometer is dead on accurate according to my GPS.

 

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I run 235/60/16's too. I agree the last thing these cars need is a shorter tire, at least if it's still stock ride height. I looked into 55's but the selection of them seems pretty small and none of the tires I was interested in came in 235/55/16 and i thought 225/55/16 would be to short for my tastes.

edit: btw if you use the tire calculator in the first post 235/60/16 and 235/55/16 both have a 9.25" section width. 235/60's also have slightly less revs per mile then stock 225/60/16's or 235/55/16's so theoretically at least they'll last a tiny bit longer. lol

Plus they're taller and fill out the wheel well a little bit more...
 

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According to the same above post:

Using this tire size comparer I found that a

225/60-16 is 26.62" overall diameter and 8.85" section width with a 6 - 9" rim allowed. Section width would vary with rim width.

235/55-16 is 26.17" overall diameter and 9.25" section width with a 6.5-8.5" rim allowed. Section width would vary with rim width.

:D
 

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OK, Correction. the 235/60/16 and the 235/55/16 have the same section width according to that tire calculator. I said 225/55/16 by mistake. I actually compared the 235/60/16 to the 235/55/16 the OP asked about. They have the same section width the 235/60 is just taller. OK?

In fact in the second part of my comment regarding revs per mile I correctly stated 235/55/60... I just accidently said 225/55 in the sentence before. oops!

I'm not sure why your point out CrystalPilots #'s because they aren't the sizes I compared. Check it out for yourself with the tire calculator. I assume you thought I compared the stock 225/60/16 to the 235/55/16? (As CP did) I didn't. I prefer to run 235/60's and that's what I compared.

Both of our #'s are correct. We just compared different tire sizes (stock 225/60 vs 235/60) and I made a typo. Thanks for pointing that out so I could fix it!
 

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Don't want anybody to be misinformed, even accidentally, and that's how it read.

The 235/60R16 is a good size for someone who has stock suspension and wants a little wider tire. The 235 width is a nice looking sporty width for our cars, without being too wide.

You are right, tire selection in the 235/55R16 size is small and they'll have to be ordered rather than being in stock. I like the BF Goodrich traction TA, which comes in that size. I've already worn one set out (50,000+ miles) and ordered my new set yesterday. They like alot of air pressure on our cars. i run 40 up front and 36 in the rear.
 

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Discussion Starter #11
I have decided to go with the 225-60-16s. They do have a MUCH larger selection. BTW, when I went to the 235-55-16s several years ago, I did notice about a 1mpg drop in highway mpg. With gasoline prices going up and my 100mile commute to and from work, 1mpg will be noticeable in the long run.
 

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235/60/16 Kumho KH11's are $60 each from tire rack. W-Speed rated, asymmetrical tread, and amazing grip in the dry and wet. A superb bargain, and I got 35K miles out lf my last set-even with alot of "spirited" driving :)
JL
 
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