7.3.1 Dimensions
Min (mm) Max (mm)
Wheelbase 250 270
Width (without bodyshell) 170 190
Width (with Bodyshell) 175 195

this is off the aarcmcc rules.
interesting that the width is diff with or without a body. i thought you would always use a body???

anway most cars won't accept anything bigger than 2mm offest and still be legal. the lower level tamiyas are the only exception to these rule that i know of.