My son in law just purchased a 99 XR200 as his first play bike,however he is somewhat tall and the bike is somewhat short with the 17" rear wheel.Would anyone have any info on wether or not there are any other models with 18" or 19'" rear wheels that would be an easy swap,or any other suggestions on how we could make the bike taller so it would be easier for him to ride as he has already bought the bike and needs to get some use out of it? Thanks ahead of time.