• Steel and aluminium are lighter / more reflective generally.

  • Looks like Ti and the welds don't look like Alu.

  • The filler on aluminium welding is much thicker/blobbier than steel or Ti.
    It's raw which means it's either Ti or Stainless and there aren't any or many stainless mountain bike off the shelf frames that I can think of. And you can also just tell from the weld but it's difficult to articulate how

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