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I have spent ~30 minutes searching for a clue, maybe I'm getting old and dull... Are the FC-TY301 crank arms made of steel or aluminium alloy?

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    I didn't find a definitive answer either, but the listing on walmart.com says it's aluminum. That would be my guess looking at pictures. The chainrings appear to be steel. – Noah Sutherland Apr 7 at 17:16
  • Yes, that was my guess as well looking at the pictures. Steel is good, be it frames or chainrings :-) – Kalts Apr 7 at 20:23
  • Steel cranks usually have rather thin arms. – Carel Apr 8 at 17:37
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The crank-arms are aluminium as of any Shimano cranks but the chain-rings in this case are steel. The axle is always steel.

If you have a unit at hand, it's easy to check with a magnet.

(Anyway, a magnet may be a useful item also in shop for a discrete test of a component or a metal frame for material.)

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  • Thank you, I didn't know that all Shimano cranks have alloy arms. – Kalts Apr 7 at 20:09

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