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Yup. Sheldon's chart shows that you should be able to go safely anywhere in the 25-37 range. Keep in mind that all tires don't mount the same though. Some are easier to get on and off the rim than others. Also, one day you might need to mix and match the sets (flat, wheel damage, who knows?) and you may notice a difference in handling the farther the two sets are apart in size. You have to choose which criteria are the most important to you.