No need to test the cages. They are anodized aluminum alloy, and yes aluminum is considerably lighter than titanium.
Chuck Schmidt South Pasadena, Southern California http://www.velo-retro.com (Campagnolo Timeline, reprints and T-shirts)
Mario Girasa wrote:
>
> howdy folks,
> need you expertise. For reasons I won't get into, I believed the cages on
> my TA pedals (on ebay) are of Titanium. I am starting to think they are
> NOT, and I wish to revise my description as such, or cancel the auction
> altogether and start over. I'm thinking of scratching a hidden portion of
> the cage, to reveal silver alloy (or not). I understand the anodizing is
> very thick and this might take quite a scratch. Also, I understand Ti can
> be anodized, but that the Ti will be notably darker than the silver of
> alloy. The box says nothing on it regarding cage composition. I have been
> informed that Ti cages are not mentioned in any TA catalog. I'm wondering
> if anyone has ever encountered Titanium cages for their TA pedals, or if
> anyone knows a non-destructive means of testing for Titanium (another
> list member informed me that grinding titanium will cause white sparks,
> whereas alloy will cause few if any sparks). These cages are insanely
> light. Would Titanium be heavier than aluminum in the same shape and size
> ? (aka, which has higher density ?) Thanks for your patience and help !
> mario girasa Cambridge, MA