Interesting, in France all the karting businesses sell 25mm solid axles in four grades:
A - Standard (Medium) C - Hard B - Soft BB - Extra soft
http://www.itaka.fr/gb/various-chassis-parts/axles/full-axle,PC0272.D.html (Look at the prices and weep for us!)
However, because the chassis size is so inappropriate some people are spending big bucks on triple B axles which is extra extra soft. Along with up to �1000 on custom made extra long magnesium hubs that do not make contact with the axle except at the pinch bolts.
I really hope that the theory that there is no difference is true. Nobody test here but they just copy each other, so it could well be.
A second hand, Cadet size, kart I bought here turned out to have a stainless axle in it, I only noticed when I realised it wasn't going rusty and put a magnet on it. It was definately faster, but once I knew I had to remove it.
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