I didn't know how much older kids weigh. I'm not good at guessing ages or weight. DS is like a block of cement. He's not fat, but broad and solid. Since he was little we've had to buy his shoes at Stride Rite b/c they sell an extra wide shoe for kids. I wonder if DS will stop gaining weight and just grow taller for a while. The strange thing is that he doesn't eat much, and what he eats is relatively healthy. My DS hasn't had fast-food yet. Shrug. It's made clothes shopping an interesting experience.
I rode a bike as a kid, but I feel uncoordinated in my 30+ years. I'm glad you've had a good experience with REI. It's nice to hear. I'll have to work on attempting to ride a bike with DS. I'll keep you in the back of my mind as comfort.