I will do some measurements soon. i think the wheels are 900mm apart. Its not as big as it looks. It is only 5mm t6 ali but hey i am not building my robot to defend itself from a couple of hard hitters. if it gets damaged then i will fix it. Saying that there is a 10mm t6 flipper covering most of the front and 7mm ti will be bolted in places. NO HARDOX on this robot. The best thing about this robot it the enjoyment of building it