My kart has 15" tires and a 8" brake disk. I must have bottomed out on a root with the disk. The disk seems fine, but the whole disk moved over about an inch on the axle, screwing up my brake setup and dislodging the key stock. I really don't think I can make the disk smaller and I can't move it over closer to a wheel. Is a 8" disk too big for 15" wheels? Will I just have to deal with it and try to avoid the clearance issues?