So my 13 y old can ride my bikes now (i am 46). I ride 60-65cm road bikes, 55-59cm mountain bikes from the 90s.

I recently purchased a 60.5cm Albuch Kotter city bike and have been tinkering on it in full view of the kids, and using his acrylic pens for touch up. He is artistically endowed, I have supplied him with a full set of paints, and so he has the supplies I need.

So today, he said he wanted to ride it. i lowered the saddle a cm, and off he went. No worries on fit, for sure.

Maybe my 65cm french fit bikes are a bit tall, but he can ride everything I own, with practice.

oh man, time does its thing.