Hi
I'm looking to replace front tires. Rears are okay 8/32 and fronts 4/32. I'm looking at michelin tires. My original are 245/35 RZ19 89Y. The ones I'm looking at are 245/35 RZ19 93Y. Will they be okay on my c7 corvette stringray z51. Just want to make sure they are okay.
Thanks

 

Should be, the higher the “Y” number, the higher the speed rating.

 

The short answer is yes, assuming the tires in question are really 245/35 ZR19 89Y and 245/35 ZR19 93Y, respectively. (I've never heard of tires with "RZ" in their spec.) They're both radial tires with the same measurements, so type and size are not problems. Both tires also have either Y or (Y) speed ratings, so that shouldn't be a problem. The difference, 89 vs 93, is in the tires' load ratings. 89 indicates a load rating of 1279lbs, while 93 indicates a load rating of 1433lbs. Obviously, you should use tires with AT LEAST the same load ratings as OEM, but (within reason) higher isn't a problem.

Right answer, but wrong reason. There is no "Y number." The speed rating on both tires, which is unclear from the OP's post, is either Y or (Y). The former means rated for speeds UP TO 186MPH, while the latter means rated for speeds IN EXCESS OF 186MPH.

 

Second picture is the tires I'm going to buy and the first is my original tires. Just want to show you guys
Thanks

 

The Michelin tires you are considering have a higher load index (93Y) than the original tires on your Corvette (89Y), which means they can support more weight. As long as the tires meet the size and load index requirements for your vehicle, they should be fine to use.

 

Hi
My rears are 95Y

 

As some of the others have indicated, the number before the "Y" indicate the load rating of the tire. 89 in the 89Y indicates the tire is rated to carry a maximum load of 1279lbs per tire. This is a load rating the tire manufacturer puts on a tire and has nothing to do with the maximum load you can carry in the car. For max load in the car, please stick to what the car manufacturer recommends. When replacing tires, the general rule is to choose a load rating (and a speed rating) equal to the one specified on the OEM tire. If that is not available choose one that has a higher value. The "Y" in there says that tire can be driven up to 186mph. If it is (Y), then you can dive it past 186mph. You cannot go above a (Y) for speed rating but you can go up to something like 150 for load rating, (not that high for the tires we use in our cars). Neither the tire manufacturer, nor the car manufacturer will ever advice you to put one with a lower load or speed rating. If you have been able to safely drive with the OEM tire, then choose the same.

When you have two different sizes of tire on a car, it is very likely that the load rating number will be different. This is normal, a larger diameter or wider tire can generally carry a higher load than a smaller one with the same speed rating. Your wider and larger diameter rear tire with the 95Y can carry 1521lbs per tire. I have never seen OEM mix speed rating, if it is Y on one tire, it is Y on all 4 of them. Always stick to the same speed rating for all tires.

Hope this helps.

 

Thanks for all the info. I just wanted to replace front tires knowing rears are new. Down the road I will get all four replaced. Thanks again. Plus the fronts are the original tires according to date on them