I am working on building my bike from my own parts. I have a choice of Chromoly or Titanium. I do wheelies and race ( Rarely ramps but sometimes ). Does anyone know what material I should use?
(Its the "Hub Axle")

Titanium ( added to Alu composites ) increases hardness, and is stronger and lighter than chromoly steel.
No idea of its tensile properties- another kind of strengh Alu does not have.

But I might be wrong... :D

Hub axles have a fixed dimension. Steel will be stronger, stiffer, but heavier. For hard use go with steel.
Ti axles are strictly for lightweight use.
This is not the case with Ti frames, where you can pick dimensions to favour the material.

Hub axles have a fixed dimension. Steel will be stronger, stiffer, but heavier. For hard use go with steel.
Ti axles are strictly for lightweight use.
This is not the case with Ti frames, where you can pick dimensions to favour the material.

About Ti pedal axles? opinion? Good post.

About Ti pedal axles? opinion? Good post.

I have Ti pedal spindles on both my MTB and RB. I believe the stated weight limit on them was something like 180lbs. I've never cracked a Ti axle though but I'm only around 140lbs.

Do not use Ti for axles, it is marginal enough as a BB axle, in a wheel it is asking
for trouble. Your application needs a lot of strength and an oversized solid axle
would be a good idea. It should be made of a rated chrome moly with a number
attached, not an innominata steel. Steve

About Ti pedal axles?

Here's some info on Ti pedal axels.

http://www.bebop.com/old%20web%20text/pages/appliedmata101.html

Titanium ( added to Alu composites ) increases hardness, and is stronger and lighter than chromoly steel.
No idea of its tensile properties- another kind of strengh Alu does not have.

But I might be wrong... :D

The same size rod, steel would be stronger but a lot heavier.
But to bear the same load, there would be more Ti but it would be lighter. Great for aerospace where weight is much more important than size.