In message , Paul
writes
have a standard Megane diesel with the original 13" steel wheels
fitted.

have some 14" alloys, will fitting these have any negative effect
on economy?

what if I went up to 15"?

cheers


If you lower the aspect ratio of the tyres then there will be minimal
change to the rolling radius. If you don't change the aspect ratio then
there will be negative effects of gearing and speedo reading.

More info he- http://www.carbibles.com/tyre_bible.html
--
Paul Giverin

My Photos:- www.pbase.com/vendee