Here are some pics (I hope) of the 4" Karata. I gotta say I didn't really notice any significant "whining". But then again, my pipes might be too loud. When riding my left heel is about 1" away from the edge of the front pulley, but no risk of it hitting. Pants might be an issue. I will feel better if I pin the extra material up so it doesn't get caught in the teeth. It is quite a sight looking down and seeing that belt spinning. I hear some whining when I pull in the clutch as the belt slows down. I tried having my son take some video but all I could hear was the exhaust.