Quote:
Originally Posted by BimmerAg
Sounds like you need to find a different tire shop. The guy there clearly doesn't know what he's talking about. The first number in a tire size ex:245/35R19 is the width in mm so you're right that they'll be wider. The second number is the aspect ratio of the sidewall height to the width, so on in the example above 245x0.35=86mm sidewall height. Upsizing you tire width without changing the aspect ratio means that the new tires should actually be slightly taller than your old tires.
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I agree with you going to a different shop. When I try to reason or understand his reasoning, he just shut me down saying "I am not here to teach you how to read a tire"! It just doesn't make sense based on the width and the aspect ratio like you mentioned. Thanks for your help.