Hey Per. 7.5" with 195 is no problem at all. A mate had 7.5" with 205/215 tires, they rubbed, but was under the arches. Well, I changed all bearings in the bottom. The sound is still there, so I put the car away for 2 month. Last week I transported the car to my work. So this week went to testing and driving the car, got 160 km, and the sound have not changed. Its the pistons that is making the noise. Now there is a problem with the heat. Think it is the waterpump, or the cooling system that is full of crap. Cleaned once, 20 km after, the water had the same dirty colour again. But it is semi mapped for 0.5 bar, and fells like a great little engine already.