The only differences are in the traction rating and speed rating. In case you can’t see from the pics, the 355’s have a traction rating of “A” and the 305’s are rated at “AA.” Odd considering “AA” is the higher rating and that’s on the fronts. As for the speed rating, the rears (99Y) are good over 186 mph but the fronts (102W) are only good to 168 mph. The treadwear rating of 200 (which most likely varies from one manufacturer to another) suggests a 60k mile life span under normal driving conditions. Will they last that long? Not if I have anything to say about it!
