Hi! I am a mom in Ca, & I used to ride bicycles quite a bit, but now that my kids are getting a little older I have a little problem. My son was born with spina bifida, & his legs (& balance) aren't as strong as the average. he has ridden a trike in therapy just fine, but when I looked at them in the catalog, they are thousands of dollars, which is just not feasible at this point. So I was wondering if any of you knew of a website where it details how to convert a childs bike into a three wheeler (if its even possible).