Apologies I was talking shit. I just checked and they were 40mm Terraspeeds I had on mine no way 45's would fit so 36-38 mm max with some mud? I did have some 35mm Bon Jon pass and Crud Racer guards as well. This is a good price I sold mine on here last year for £700 without wheels
Hey, I am not 100% sure but what @Retro_Bastard about 42's sounds plausible but I imagine at that size they would quickly glog up in muddy conditions.
I will try and double check tomorrow for you