not take them to the boozer, get them drunk & take them into the back seat of your car, but how do you tell how old they are? my size slick is out of stock & there's a set of slicks, similar size to what i'm looking for on a Rail thats out of service. they're Goodyear Eagles & the rail they're on has been parked for 5 years living in an enclosed trailer. before the rail got parked the slicks only saw 1 meetings use but i'm concerned they maybe a bit hard now. still it would be good to know exactly what year they were made as a bargaining point. so how do you tell?