Bike frame size question for 9 year olds
Long story short, I have twin 9 year old daughters around 4’-11” 90lbs. We ride easy single track, gravel paths and streets. They are both somewhat aggressive on single track. They have out grown they 20” bikes and we are looking at new/used bikes. Any suggestions on 24” (wheel size) bikes vs 26” 13”-15” frame bikes. Is there any advantages or disadvantages to these sizes?