Originally Posted by
CollectiveInk
Thanks to all for the advice.
I did get some 1.25 tires today and spoke to a cycling coach. I'm going to have my son help mount the tires as a learning experience. The coach is going to help refine his bike fit, and work with him on his skills. I figured this might work since he takes soccer advice from his coach vs me... perhaps cycling will be the same.
It is a child's prerogative to ignore a parent's advice. This is why my wife and I have cats. (Don't have to teach 'em how to drive, don't have to send 'em to college...)
As to tire sizes- your discovery that 1 1/4" does not equal 1.25" is just the start. Read the Sheldon Brown article- it's a long, dark, sordid story.
Jeff