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Yes, the sidewall will be 4mm shorter. Tire sizes work like this 245 (tread width in mm)

40 (Ratio of sidewall to tread width) 18 (Bead diameter) so 245mm X 40% = 98mm, 255mm X 40% = 102mm. Hope this helps.

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14y ago
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Q: Is a 245 40 18 tire lower profile than a 255 40 18?
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