Originally Posted by dan6
The cranks are 170's-but even though shes only 12,shes about 5'5"- almost as tall as her mother. Her legs are in proportion. 170 crank arms OK? Thanks for input, Anthony.
Are both the old and new one's 170mm?
I'm sure she could use them but long cranks make riding uncomfortable and teach bad long term cycling habits. See
http://www.cranklength.info
I mean if they are what you have there fine and everyother bike seems to have them but if the old ones were shorter and the new ones were longer I would be concerned about fitting them.
I have an interest in this subject because I now use 140mm cranks thanks to the advise from cranklength.info and its improved my cycling enourmously.
Regards, Anthony