Can 225 55 r18 substitute 235 55 r18?

Yes, a 225/55 R18 tire can substitute for a 235/55 R18 tire, but there are important considerations. The 225 tire is narrower than the 235, which may affect handling, traction, and ride comfort. Additionally, the overall diameter of both tires is similar, so they should fit on the same rim, but it's crucial to check your vehicle's specifications and ensure that the narrower tire won't cause any clearance issues. Always consult with a tire professional before making substitutions.