Originally Posted by Yorkshiretea
Never heard that myth but a larger wheel does give you more "purchase" and does increase the gaps on markings over 45yds. It's also easier to move a larger wheel small amounts with a glove on.
If you make a wheel larger the gaps in terms of the distance between them is bigger but their relationship is the same. A 2" wheel will have gaps half as big as a 4" wheel but both wheels will have to be turned by the same amount of degrees to go from say 45 to 50 yds.