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Discussion Starter · #1 ·
How accurate will my speedo be with 18 inch alloys and 40 profile tyres? When I'm sitting at an indicated 60 it feels like I'm going a bit faster than this…….cant describe how accurate my "feeling" is though lol……it just feels fatser than 60. How much do differing wheel sizes over standard affect the speedo reading?
Cheers :)
 

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I'm running 245 45 18, speedo reads 60 sat nav reads 60, would i be right in thinking 40 profile, speedo would be reading slightly low and acceptable.
 

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Discussion Starter · #12 ·
Cheers folks. I've got the steelies with tyres to measure against the 18s…..didnt think of doing that really, good idea. It's not a big deal just curious as would like to keep the van around the 55/60 mph mark to help the mpg….she's a thirsty beasty!! Think I'll get my gf to sit behind at a steady speed and see what the car speedo says. Cheers
 
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