* P225/75R15: This was a very common size.
* P235/75R15: Also frequently used.
To know the exact tire size for *your* specific 1996 Chevrolet S10, you should:
1. Check the sticker on the driver's side doorjamb: This sticker lists the recommended tire size and inflation pressure.
2. Look at the sidewall of your existing tires: The size is printed directly on the sidewall of the tire.
Don't rely on generalized information; always check your vehicle's documentation or the tires themselves for the correct size.