As with any biker, I know it will be a matter of upgrade, modify, upgrade. I am guessing he will be growing 3-4 inches a year for the next 3-4 years...so we are looking at a long term project. Don't want to put too much into a bike he will outgrow quickly, but mods and adeptations will be a learning curve. Find what works and keep it, find out what doesn't and reject it. Just like any "Normal" biker. Here is a shot, 20 miles in on our 35 mile trek from a few weeks ago.