I have an old bike that has a cheap square taper crankset.
And I would like to attach a crank arm power meter to it that will fit a Shimano crankset.
Is there an adapter that can fit into the square hole and offer grips for the Shimano crank to hold onto or do I have to buy something like a Tiagra or Sora crankset and fit that to my bike? (the crankset would be worth more than the bike at that point haha)