225/70/15 vs 235/70/15 - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 09-09-2014, 12:28 PM Thread Starter
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225/70/15 vs 235/70/15

Is there a big difference between the tire size in reference to handling, traction, and tire wear from your experiences?
I'm debating on whether or not I'm going to go with the smaller 225 for my new set of tires on my 1994 roadmaster.

Thx
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post #2 of 11 (permalink) Old 09-09-2014, 02:54 PM
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The difference (if any) would be negligible. The specific brand and model of tire will play a far bigger role in its performance.

Mike - '94 BBB SS (RIP 06/16) - '95 DGGM SS - '96 DCM SS - '92 BBB Wagon
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post #3 of 11 (permalink) Old 11-16-2014, 12:45 PM
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I have my own spreadsheet I use to compare tires, but I also really like this site. Why guess, just plug it in!

http://tire-size-conversion.com/tire-size-calculator/

Ian - Portland, OR
1994 Roadmaster Wagon - Light Drifwood Metallic, tow pakage
1974 Alfa Romeo Berlina - daily driver
1968 Reinell 18' - 100hp Evinrude V4
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post #4 of 11 (permalink) Old 11-16-2014, 02:11 PM
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Quote:
Originally Posted by autoarcheologist View Post
I have my own spreadsheet I use to compare tires, but I also really like this site. Why guess, just plug it in!

http://tire-size-conversion.com/tire-size-calculator/

That's a pretty cool link to check for tire info.

You can also go to someone like tirerack.com and plug in a tire size. You will get a lot of similar info as well as recommended rim sizes for a specific tire.

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'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #5 of 11 (permalink) Old 11-16-2014, 03:25 PM
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Discount Tires Direct.com was a sponsor of our site. We should give them a shot at the business. They have done great by me several times!!

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post #6 of 11 (permalink) Old 11-16-2014, 07:43 PM
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My Alfa is supposed to run 185/70R14, the only good tires in that size are snow tires.

Ian - Portland, OR
1994 Roadmaster Wagon - Light Drifwood Metallic, tow pakage
1974 Alfa Romeo Berlina - daily driver
1968 Reinell 18' - 100hp Evinrude V4
1966 Streamline Countess 26' Trailer
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post #7 of 11 (permalink) Old 11-17-2014, 06:56 AM
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Quote:
Originally Posted by Marky Dissod View Post
Unfortunately, when you shop 225/70R15, 215/75R15, 235/70R15, and 225/75R15, you'll find that those tire sizes are no longer very important to the tire market.
(Or, that we are not relevant enough to the tire market for them to provide us with high-quality tires.)

None of those tire sizes [which happen to be OEM for B-sedans and B-wagons] have that many options.More importantly, none of those tires have anything that outperforms what was available five years ago; rather, they are backsliding.

Here's what I get when I search Tirerack.com:
225/70R15: 15 results; 1 Q-rated, 1 R-rated, 7 S-rated, 6 T-rated
215/75R15: 18 results; 3 Q-rated, 10 S-rated, 5 T-rated
235/70R15: 12 results; 5 S-rated, 6 T-rated, 1 V-rated (amazing)
225/75R15: 15 results; 7 S-rated, 4 T-rated 4 NOT rated (wonderful)

For those of you that will 'listen', I strongly suggest you consider 235/75R15 [the optional tire size of the Cadillac Fleetwood V4U].
235/75R15: 55 results; 7 Q-rated, 4 R-rated, 22 S-rated, 21 T-rated, 1 NOT rated

Even if you decide to completely ignore 235/75R15 beyond this post, you can't ignore the fact that the other 4 sizes have degraded to become very sad options indeed.
I guess 15" tires are not that popular anymnore and don't think many new cars even have that size wheel. Back when my Caprice had 15" wheels I first switched over to a 16" wheel before getting the Impala 17's. The most important factor to me was getting a 16" tire that had the same overall diameter as the stock tire.

FWIW I ran a 235/60/16 and these were a hard find unless I wanted to shell out good money for the Michelin's which were a heck of a tire and had them at first.....MVX4?? I later settled on a 225/60/16 that was offered by a lot of other vendors and much more cost effective allbeit a little shorter tire.

================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #8 of 11 (permalink) Old 11-17-2014, 01:22 PM
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225/60/16 is the stock size on the Subaru Outback, so at least out here in Portlandia they're as common as dirt.

Luckily our tires are past the 50% mark so I can justify upgrading to 17" wheels. I'm having a hard time pulling the trigger, so much $. Ugh.

Ian - Portland, OR
1994 Roadmaster Wagon - Light Drifwood Metallic, tow pakage
1974 Alfa Romeo Berlina - daily driver
1968 Reinell 18' - 100hp Evinrude V4
1966 Streamline Countess 26' Trailer
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post #9 of 11 (permalink) Old 11-17-2014, 02:22 PM
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Quote:
Originally Posted by 4DoorSS View Post
I guess 15" tires are not that popular anymore, and don't think many new cars even have that size wheel.
These days, 15" tires are usually the 'base' option on cars with much lower load ratings, I.E., subcompacts and compacts.
Quote:
Originally Posted by 4DoorSS View Post
Back when my Caprice had 15" wheels I first switched over to a 16" wheel before getting the Impala 17's. The most important factor to me was getting a 16" tire that had the same overall diameter as the stock tire.
If you just want four pieces of bubblegum for tires, stick to whatever tire size you think is 'required'.

If one wants a better selection of somewhat better tires, just make sure you don't go under the minimum load rating for your car (98 for the B-car, 100 for the D-car), which will naturally lead to shopping either
235/75R15
or
255/70R15.

If one wants a significantly better selection of significantly better tires, upgrade to a 17" or 18" wheel.

I suppose 16" wheels also allow for a better selection of tire options, I just have no experience with 16" tire choices (but quickly perusing TireRack's availability makes me lean toward 235/70R16, or 275/60R16).
Whichever tire size provides the best tire for my needs / wants and exceeds the minimum load rating (98 for the B-car) gets my money.
Quote:
Originally Posted by 4DoorSS View Post
FWIW I ran a 235/60/16 and these were a hard find unless I wanted to shell out good money for the Michelin's which were a heck of a tire and had them at first … MVX4?? I later settled on a 225/60/16 that was offered by a lot of other vendors and much more cost effective albeit a little shorter tire.
Have you considered 235/70R16 or 275/60R16 yet?

For those of you who are afraid of your speedometers being 'off', this is the ImpalaSS Forum, by now, it should be easy to find someone local who will reprogram your speedo for about $50 or so.

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Last edited by Marky Dissod; 12-19-2014 at 09:11 AM.
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post #10 of 11 (permalink) Old 11-17-2014, 03:58 PM
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225/70/15 vs 235/70/15

Guess I don't understand the focus on these really anemic tire sizes,when these cars allow for far more robust sizes. Is the speedometer being off by a couple miles per hour up around 70mph really that big a deal? Guess what,it's probably off by more than that anyway. Look on the sidewall of some of these tire to see how much weight they're rated to carry (if you dare) many/most of the smaller sizes mentioned are intended for cars actually weighing at least a thousand pounds less.

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