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possible exception of saddle rails.
My saddle has titanium rails and aside from a single bolt somewhere I've got nothing else. Through poverty I have become #testerapproved
But more to the point why does it make any difference on the rails?
frankenbike-
why does it make any difference on the rails?
They need to be strong and fatigue resistant, but not necessarily very stiff. Ti alloys can do all that in direct substitution for low alloy steels, and using solid Ti rod which is self-passivating rather than steel tube which needs an anti-corrosion surface finish may yield the same or lower weight at a comparable cost.
gbj_tester
In my experience, yes. I ended up putting Loctite on mine, although that was in a steel frame and at least a decade before Tacx paste was invented. I think the combination of hardness and smoothness makes for poor grip, but that can be mitigated by the frame material (aluminium is sticky) and friction modifiers in the lube. Not an arrangement you'd want to change position on daily, though.
Seat posts are one of the bicycle components* where Ti offers no benefits unless you happen to love grey jewellery.
*The others are literally every other part of a bicycle with the possible exception of saddle rails.