just checked some notes on the kids bikes …
the small 20” bmx racers had 140 - 155 mm cranks
the 24” bikes had 160 mm cranks
the small 26” bikes they rode had 170 mm cranks … they quickly grew through this stage (and left me there lol)
t2p thanks for the scoop. I'll check the current 24s in the garage and add the info to the mix.
I scored the lightly used goody for a fraction of the new cost.
https://www.ebay.com/itm/126239384152. One more pice is in the puzzle.
At this point, I am thinking 160 might be the best choice but that's still up for debate.