My current scooter (A "new" A) is starting to sort of fall apart. The main problem is that the bearing in the rear wheel keeps on spinning out of the wheel when I am riding. Also, the head where it connects to the folding mech assembly is loose. The handle bar grips are pretty worn out too. Also, my scooter is extremely slow and I would like to have more speed. All of these I can ride with just fine except for the bearing problem. My question to you is: Should I buy one of the new pro models, or should I just replace the bearings/wheels?