Today I did a brake job on the rear. I noticed the left rear tire is going to need replacing as the tread bars are indicating wear. The two tires on the rear were of different manufactures. The right tire is an Arroyo Grand Sport A/S 255/35ZR19 96W and is in like new condition. (Only had car a couple months.) I can't find another Arroyo tire with the same numbers. The one that I can find is designated 255/35R19 XL 96W which is a higher weight bearing tire than what is currently on my car. Don't know what the "Z" means before the "R" for Radial inner construction. Will it make any difference to match the higher load tire "XL" with what's currently on my car? And what does the "Z" mean?

 

I googled the specs you posted and a match came up on eBay

 

Thanks! I also found one. that listed my number and said is also compatible with the XL numbered tire. I'll see what the sidewall says when it arrives.

 

The tire arrived yesterday and it is the same tire as the one I already had.

 

Tire markings are not hard to decode - and the math is really rather simple.
"Z" means the tire is capable of speeds you will not likely ever drive.

Google can be your friend, here is one of many resources on the web that explains it all:
https://shop.advanceautoparts.com/r/...ead-tire-codes

 

Thanks! In my web search I had found everything about tire codes except for the "Z" next to the R. Good to know that I can safely go faster that 55mph! LoL