aluminium
What about Titanium?
It depends on the alloy (commercially pure Ti is quite poor in this regard), but fatigue strength is generally good relative to tensile strength and compares well with both steel and aluminium.
@Scilly.Suffolk started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
What about Titanium?