[Sohcahtoa82]

Even manually pulling up the nose once you reach Vr isn't necessary if you just trim for a little extra nose-up. It'll eventually get off the ground with just enough speed.

[rkomorn]

There's no lack of online arguments about whether or not Vr is "real" or should exist.

I just followed what my CFI and Cessna's manual for the C172 said (which iirc was giving input to rotate at 55kts).