veloellen

My son loves competing in triathlons (youth) and does quite well. He presently rides a TREK kdr with 24 inch wheels (40cm) but its getting too small on him. These next 2 years or so are tricky since in a short time he will certainly outgrow any bike we buy him now. Do I go with 650 wheels or 700's? The advantage of 650 wheels on a 43 cm frame is that the top tube is smaller and will fit him better this year and next. However, a 43 cm bike with 700cc wheels may last longer and have a better resale value. There are 2 bikes I'm looking at now, both TREKS, similar costs (about $700 used)...thoughts here or suggestions?
I should add we are a road bike family not a tri family so our mind set is 700cc if you know what I mean...
Thanks!

Necessity

Going through the same heartache. The KDR comes in a 44cm. As far as the 700 tire size thing you will have issues with toe overlap until you are looking at least a 52cm bike. Unfortunately I just chose to keep upgrading bikes so that my children have comfortable, safe, and fun rides so that they continue to enjoy the sport....hope this helps.