What's the "L" for?

I use these.

enblethen wrote:
It is the speed rating of the tire. Scroll down on this link for more information.
Tire coding

Thanks!!

A maximum seventy-five mph rating isn’t bad but could be better.

It is the speed rating of the tire. Scroll down on this link for more information.
Tire coding

most likely the maker, but put goodyear indurance on one size heavier if it takes C put D,s on. and keep them covered when not in use. the sun will kill any tire in a few short years.