Originally Posted by kshansen
Have you looked at the idea of finding different wheel bearings with larger I.D.? Possibly changing from ball bearings to tapered rollers, they sometimes are available with larger I.D. while still using the same O.D.. 17mm axle does seem a little small.
I'm going to guess that the bearings in your wheel are 6203 ball bearings with 40 mm OD. 17 mm ID and 12 mm wide.
Might want to look into this bearing:
This would let you increase axle from 17mm(0.67 inch) to approximately 19 mm (0.75 inch).