Crankarm for Diamondback

[Richard Burrows]

Will a FC-CT93 fit a FC-TY40 crank arm

[ReapThaWhirlwind]

It fits based on the bottom bracket type.

How it matches is another thing. They look very similar, but there's obviously going to be a difference.

These are both square taper cranks, so they should work as replacements in any fashion.