Can you substitute 245-70 r17 with 255-75 r17?

Yes, you can substitute 245/70 R17 tires with 255/75 R17 tires, but there are some considerations. The 255/75 R17 tires will be wider and have a larger overall diameter, which may affect your vehicle's handling, speedometer accuracy, and clearance in the wheel well. It's important to ensure that the new size is compatible with your vehicle's specifications and that there is enough space for the wider tires. Always consult your vehicle's manufacturer guidelines or a tire professional before making the change.