[Dizzy]

Hey guys I'm going to change the tires on my 250 pretty soon as some know I got it and it had 20 miles on it but it sat for about a decade in a barn and there are little bit of small cracks on the tires but they hold they hold air and everything should I be worried riding it I plan on changing them out soon I was wondering about what the sizes are I've seen some say 17 some say 16 it's a 2000 250 r or ex don't know the difference any input on good places to buy them would be a big help and was wondering if I can widen the back tire? Well lmk what y'all think and have a great night every one and ride safe ✌️