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· US Air Force (retired)
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I'm running 275/40-17s.
 

· Registered
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I had that same setup with 315/35's on the back and 275/40's on the front. They are the exact same height and much up great.
 

· US Air Force (retired)
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13,570 Posts
the tallness wouldnt look weird with a 35 back and 40/45 in the front
Tires are measured in millimeters. To calculate tire wall height you multiple the width times the aspect ratio. A 245/45 tire has a 110.25mm (245x.45) height. A 275/40 has a 110.00mm (275x.40) height and a 315/35 has a 110.25mm (315x.35) height. From the side all three tires look exactly the same.

A 255/40 has a tire wall height of 102mm. If I interpeted your question correctly you seem to be asking if it would look weird to have a taller tire on the front than the back but the 255/40 isn't a taller tire. It's 7.5% shorter. It's only 102mm tall while the 315/35 is 110.25mm tall.
 
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