I think the Fast n Furious series are a reasonably true 1/55, they're certainly bigger than the "standard" 1/64 'ish Hotwheels. I bought a couple based on the advertised scale rather than my own judgement. IMO they work with 28mm minis on their own. They certainly won't mix in well scale wise if you start using 1/43 diecasts alongside them. I don't presently own any Crooked Dice vehicles but use the CD accessories for modifying/accessorising other makes, particularly the Disney Cars range, which, if you avoid the blatantly cartoony ones, provide some useful 30's thru' to 60's models. Can post some comparison shots of various vehicle makes (sorry, no Crooked Dice!!) if you like. Cheers, GDonk