I’ve got a 10 yr old who wants to MUni with her sister and me who both ride 24" MUnis. She’s on a cheap Torker 20". Her legs aren’t long enough for a 24 with long cranks. Soon, but not yet.
I’m not worried about the Torker’s sturdiness, since she won’t really be giving it too hard of a ride. But I’d like to get the biggest tire I can manage, so she’ll get the benefit of low psi shock absorption.
go to the lbs with the uni. ask for the fattest tire that’ll with the rim/frame. should be a little over 2 inches. and will more than likely be a bmx tire.