Not sure what rimDiameter size options are for your 1988 GMC C1500 Sierra SLX Extended Cab?
Choose from the options below.
Version/Option
Tire Size
235/75R15
Version/Option
Tire Size
235/75R15
Version/Option
Tire Size
Version/Option
Tire Size
235/75R15
Version/Option
Tire Size
Version/Option
Tire Size
Find your version / option
There are two places to find your tire size. Look directly on your tire sidewall or inside your driver’s side door jamb for your vehicle’s tire size.
Passenger Tire Sidewall
High Flotation Tire Sidewall
Inside Your Door Jamb