Tire sizes on stock rallye wheels.

MoparLeo said
The person posting never said if he had disc or drum. The factory disc was a 4 1/2" pattern. The drum was 4".
I have posted the charts for tire sizes, rim widths, tire diameter, load range of the different tires. Do some researching with the charts.
For example the 225/60-15 is the same diameter as the 205/70-14 .

Sorry, but in 1972 even the disks were 5x4", and had a narrower track than the BBP disks did. 1972 disks were still the Kelsey Hayes 4 piston calipers, with rotors that had a 5x4" and 7/16" diameter studs. 1973 was the first year for the single piston calipers and 5x4.5" bolt pattern for A-bodies.

str12-340 said
So I have another Dart with the Mopar Performance kit to move the springs in a bit, so I have 7 inch rallye wheels on the back with 245-60-14 tires. Yes this is better, but it also cost a bunch of work and $$$ to do. That car also ran on factory 5.5 inch rallyes for two decades with 245s with no problems before I changed things over, including no abnormal wear that you describe. Between the two Darts, I've run 245s on stock rallye wheels for well over 130,000 miles over 35 years ( before that we mostly used belted bias ply tires :)). I'll take, my experience and that of lots of FABO members over many years and many miles over numbers in a chart based on theory, not long term collection of data, any day. According to your previous post, my experience is supposed to now mean something, right???

Sure, your experience means something. You said it yourself, the 7" wide wheels are better. They are, that's the end of the story. Will putting 245's on a 5.5" rim kill you? Apparently not if you drive like you do. But that doesn't mean it's good. Or right. Or even safe.

I've run E and A-bodies as my daily drivers (My '74 Duster is the newest car I own) for about 12 years now. And well over 100k miles in that time, daily driving year round in all weather conditions. I also do a decent amount of "corner carving" driving mountain roads. I have driven classics (most older than these mopars) almost exclusively since getting my driver's license which is now about 25 years ago, and far exceeds 135k miles. Like I said, I've logged well over 100k just on my Mopars. And MY experience tells me that you should listen to the manufacturer's recommendations. Because it DOES make a difference. I've run tires that were outside the manufacturer's specs, it's not worth it. You spend more money on tires and don't get better performance. It's a waste of money just for bragging rights. Tires on rims outside the recommended rim widths have poorer handling. And I've pushed them hard enough to know that.

And regardless, the charts and data that you are ignoring have been put together by people that know more about tires than everyone here on FABO combined. Me included. Your opinions and experiences are not worth more than the knowledge of the folks designing the tires, or the hundreds of thousands of miles of testing they've done. I don't care if put a 100 million miles on your tires, your opinion is not greater than their knowledge. You will never know as much about tires as they do. And that's fine, right up until you think you know better than they do.