what is the best aftermarket axle for the 400ex?

 

Get a lonestar, they're way better than stock, and have a true lifetime guarantee. Durablue's are nice, but only have a one time replacement on their axles. You break it more than once, and they give you a "discount" on the second one. I race my 250R on a motocross indoor track, more like a supercross track, and weigh 225lbs, and have never bent my lonestar, and I jump the sh*t out of the thing. It was definitely worth the money.