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Maximum wheel width for a 255/50R19 is 9”, and for a 245/50R19, it’s 8.5”. So you’re basically painting yourself into a corner with a 19 x 9.5” wheel. If you want smaller tires, then going up to a 20” wheel will increase the wheel width range.

You’d think so, but there was no noticeable difference.

Was it the Hybrid Premium Plus wheel?

Well… yeah. 99% of them are using the same base oils, and the API and other standards dictate what goes into the add pack (maybe not directly, but with a given additive’s effect on performance being what it is, there are only so many recipes a manufacturer can follow that give the desired result).

A good engineer acknowledges that aesthetics helps to move product. It may not be the most functional design option, but sometimes your priority is keeping yourself in beer and cigarettes.

Okay - since I’m the “offender” I’ll address this. I called somebody some schmoe on a forum. I’m some schmoe on a forum. So is everybody else here. We all have opinions, but we’re also capable of bringing facts to the table. I brought facts in the form of tire manufacturer specifications that...

I did ask the OP if he was trolling on another thread. He said he wasn’t, but I’m still not convinced.

You’re golden. That tire is going to be a bit of a waste on the wider wheels, so if they’re your winter fitment and you have OE 19” wheels, I’d put the Pirellis on those and save the Enkeis for a summer fitment.

Most likely they’ll be fine. What size of tire are you looking at?

And I’d be perfectly willing to call the people doing it “dangerous and stupid” to their faces. They’re the same people who post pictures of heat cracking, and then blame it on parking in the sun.

Sure - follow the advice of some schmoe on a forum over actual technical specifications of tire manufacturers, just because it fits what you already wanted to do.

I want to let it go, but my personal code of professional ethics demanded that I do the math. The placard pressure on a CX-5 with 17” wheels is 34 psi. If you consult a load-inflation table it will give you a load of 1746 lbs at that pressure. Following the P-metric to LT-metric conversion on...

Only one inch of that is below the axle.

That’s not just your opinion, though. There are several objective reasons why LT-metric tires aren’t appropriate for a vehicle like the CX-5. For one, the rubber compounds used, and the bulk volume of tread material, both contribute to hysteresis and heat buildup in the tire. You can offset...

Really? Then what’s this? I never said anything to dissuade anybody from using a 29.5” tire. I said that an LT-metric tire is an awful idea.

Okay, so then I went and looked at what’s actually available in 225/75R17. Tire Rack has five options, all of which are E-load range LT metric tires with S speed ratings. They’re going to be stiff to begin with, and you’re going to need to inflate them to a higher pressure than what you’re...

Yep. A CX-90 wheel that’s 21 x 9.5 +45 fits, and you’re well within that envelope.

245/55R18 has a bunch of good options. If you mount one on an 8.5” wide wheel, it’ll be reasonably stiff in steering rate while still giving you the ride advantage of an extra half inch of sidewall height.

Mazda, nor any other OEM, makes wheels themselves. They buy them from a supplier. Any steel wheel that you’d buy at a dealership will be from whatever source could fill the order at the best price the last time the dealer needed them.