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Tire substitution thoughts

722 views 2 replies 2 participants last post by  JDC  
#1 ·
Firstly, I know this subject has been beat to death (and I have no reason to make a tire swap at this particular moment as I've only driven 1500 miles since buying the Mazda), but I have a couple of questions about which my salesperson and the folks on this forum aren't "in synch" .
1) I've read that my 2024 CX-30 (2.5S AWD) is front axle biased when it comes to distributing power to the wheels. Does that mean (if/when I have a tire issue) I could get away with replacing only two of the tires instead of all four? I brought this up with the sales-guy (as I'd read, here, that complete tire replacement was necessary). His response was that all four didn't need to be changed at the same time.
2) I live in southern Arizona where (unless I travel out of the area) I very rarely experience snow/rain conditions but the road surface temperatures are more likely to reach 150°+ during the summer months. What kind of tires best handle this degree of heat?
3) Different subject but related to the heat, here ... Which motor oil best suits this climate? I've read the "go to" is 0W-20 but is that just recommended for EPA purposes or is (for example) 5W-30 a better choice for this climate?
4) No matter what the rating, is fully synthetic oil going to tolerate high temperatures, better than semi-synthetic?

Thanks, in advance, for sharing your experiential wisdom.

Ok .. I've reached my question "quota" for a while. I'll stop now and let you get a word in, edgewise lol
 
#2 ·
1) The tire diameters matter. If all 4 tires are evenly worn and you only replace the fronts, then the front tires with more tread will have a larger diameter and will cause excess wear to the center diff/coupling because the front and rear will constantly be turning at different rates. Same way uneven diameters left and right on the same axle will cause excess wear on the axle diff. But I have no knowledge of how much additional wear the size difference will cause. Virtually all transverse-mount AWD cars are front-drive biased. Ideally, you will be rotating your tires so they should all wear at the same rate and all 4 will require replacement at the same time. If you get a puncture that cannot be plugged, you can have a tire shop shave down the tread on the new tire to match the treadwear of the other 3.

2) I've never had issues with Michelins. Pilot Road A/S in 225/55R18 would be my choice.

3) Either 0W-20 or 5W-30 will be fine.

4) Yes.
 
#3 ·
Thanks for taking the time to answer my questions. I've heard of "tire-shaving" to bring a new tire's diameter in line with the other three. I've read, here, that Tire Rack does it? I'm pretty sure places like Discount Tire don't and I haven't had the CX-30 into the dealership for any service so I have no frame of reference to judge whether or not they'd do a competent job with tires.
The problem, as I see it, is that dealerships (or any tire places for that matter) kind of have a conflict of interest in that it's their JOB to sell you as many new tires as they can get you to buy rather than earning less for merely bringing a new tire into spec with the three remaining.
Thankfully, I've (hopefully) got many more miles to go before I need to deal with this but it's always great to know (at least sort of) what I'm talking about when I'm confronted with the "hard sell" from a shop.
To be perfectly honest, if there'd been a CX-30 with FWD, I'd have bought it but that's one of compromises I made since there was no one vehicle that "ticked every box" on my wish list !

Thanks again