Does anyone know what the 2021 R 575hp tire sizes are ? I just had my original stock pzeros replaced and before the switch I had a ton of tire skip during cold weather and now with the new ones on I don’t get that, and the front ones also look smaller? The sizes I see currently are front: 265/30 R20 and rear : 305/30 ZR20

im trying to understand if they put the wrong tires on??

 

Sounds about right to me - I believe those were the sizes on the now discontinued SVR, also 575PS.

Edit: Oops, fronts should be 35 profile, I assume you made a typo?

 

According to Tire Rack, your fronts should be 265/35 and rears 305/30, so the fronts do look a bit skinnier!!
If they replaced P-Zeros with new P-Zeros why would they change the size - unless they fitted what they get.
Why would you need to replace P-Zeros on a 2021, and why would you fit P-Zeros again??

 

no it’s definitely 265/30. So they messed up?

 

hit a pothole and they were all worn enough to replace. I’ve tried the Michelin’s and liked pzeros better honestly. Less tire skip

 

Yep! That'll be why they look smaller, then. The rear sidewalls will be 91.5mm and the fronts, at 35 profile, would be 92.75mm. At 30 profile the fronts would be 79.5mm, so would look much thinner than the rears.

 

Thanks for the info! Is the smaller 30 safe to drive ? Any major difference besides visual ? I’ll call them when they’re open next week to switch them out

 

They'll be more prone to hitting rims on potholes since there's less sidewall to cushion it. Apart from that, should be okay.

 

Even thought the installer screwed up, I would limit my driving to the return trip to dealer, if you expect to get full credit in replacement.

 

yeah that’s a good point about less cushion. Plus I’ve noticed the tires are spinning and losing traction more easily with colder roads compared to the 35’s

 

Your speedometer and odometer will also be affected by the smaller size (albeit slightly). Smaller diameter means more revolutions for a given distance. So your odometer will actually record *more* mileage than you actually travel (by about 4%--tire will make ~768 rotations per mile vs ~738 rotations per mile for the correct size) and your speedometer will show you traveling *slower* than you actually are. So when your speedo shows 65mph you'll actually be going 62mph, and when your odometer says you've gone 100 miles, you've actually gone 104.

 

Also not good for AWD to have different front/back rotational speeds.

 

Yes. This is the main concern. Different front and rear tire sizes will shred your transfer case/ drivetrain. Get them corrected asap.

DC