Originally Posted by
raceguy13
So does the HD axle use a different bearing? I don't see how the axle could have a bigger diameter to make the hex tight while still using the stock bearing.
The bearing diameter is already larger than the portion the hex clamps to. So they have room to increase the diameter of only the part the hex clamps to, without changing bearings. Just look at the link Wildcat posted to the titanium axles. You can clearly see the part of the axle the bearings sit on is a larger diameter than the hex portion.