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tynan [quote]MrSmith now i don't know what the hardness figures for ti-nitride v's titanium are but one your flakey chav bling coating wears off my drivetrain will just be bedding in.

Young's modulus of:

Magnesium - 45
Aluminum - 69
Brass/Bronze -100
Titanium - 115
Carbon Fibre reinforced plastic (50/50 fibre/matrix, unidirectional, along grain) - 150
Steel - 200
Silicon carbide - 450
Tungsten carbide - 500
Titanium Nitride - 650
Single carbon nanotube - 1000
Diamond ~ 1000-1200

'Bedding in' as we know is a euphemism for 'wearing out' ! ;P[/quote]

Youngs modulus tells you nothing in this case, you need vickers hardness:

Titanium: 0.97 GPa
Titanium Nitride: 24.5 GPa

So Ti will wear quicker.

Titanium is not a 'hard' material. Joe Bloggs usually doesn't make any distinction between tensile strength, fracture toughness, hardness and youngs modulus though and thinks Ti is better than anything else (except carbon, depending on who you're talking to). Not so - depends on the application innit ;)