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I love titanium bolts, but I've kept the steel ones on the rear hinge. The only other steel bolts I can think of on the bike are those holding the wheels on and the crank bolts - all the rest are titanium. But the pivot hinge and bolts are effectively disposable as it's often necessary to drill the bolts out when replacing them, so having titanium ones seems just a bit too profligate.
Also, while titanium doesn't rust like steel it does have epic galling issues particularly when used in two titanium parts threaded together. Not too much of an issue if you use plenty of anti-seize, but given the hammering the pivot and bolts get from their location, I suspect galling would be an issue.
tldr; listen to Scoble
Brommers
edscoble
Is there any benefit besides marginal weight and bling improvements to getting the ti rear pivot hinge axle and bolts? Did I read something about the steel one rusting up?