only thing you need to check for if they are that old is dry rott which is cracking in the sidewall or tread and the squeeling when you turn is prolly just from cheap tires it doesnt mean they are bad mine do it and its just cause of how wide they are so just check thread depth and dry rott and have tire psi at 30-33 and if all that checks out then they should be fine.


PS- if you dont know how to check this stuff just take it to a tire store and have them check it for free.