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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
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?