Will 235 r70 tires fit on 255 r70 rim?

No, 235/70 tires will not fit properly on 255/70 rims. Tire width and rim width need to be compatible for optimal performance and safety. A 235 tire is narrower than a 255 tire, so it may not seat correctly on the wider rim, potentially leading to handling issues and increased wear. It's important to match tire sizes to the appropriate rim width for safe driving.