[Savage GT]

Another Ferrari Fly body model with Amato Chassis, different motor, this time a in line Sideways 20k motor. 

That had me scratching my head for a minute, Sideways only do a 17k and 21.5k motor .... but if its from a Sideways group 5 that makes sense, as its  a re-wrapped Slot It 20.5k Flat 6 motor 

I would take the overall tyre width as measurement personally - all tyres will need a rounding on the edge for consistent performance IMO.
Using a 13mm wide tyre and rounding it so the contact area is 12mm does not make it a 12mm tyre  .... just my tuppence worth 

I am enjoying all the pre race build up and introductions, as usual great work, many thanks to you for taking the time