Yes to true your remarks, I agree, but the kart is off the ground due to been used on the beach and rough terrain, will run too sets of wheels for different Situations, the weights given were correct, the kart is wide enough with the 750 tires that are on there now, I feel the weight now will keep the kart on the ground, but time will tell... I do feel the traction with these wheels will be far better, than any other sort, we have had a few racing karts in the park behind us and they all had trouble with traction, and as this is were we will be running it the reason we have gone this way, for road use I would fully agree as to lower but wider wheels.
But let's test it and see, but thanks for the input, great to get feedback..