Howdy 1st time poster. Go easy:thumbsup: My son is going on 5 and has been on his PW 50 for a year now. Has no trouble riding it since day one and rides local mx track and around our property (10 acres). His younger brother will be looking at learning on the PW in the next 6 months, so was wondering if to upgrade to KTM mini or SX Jr for the 5 year old. He may attend some race days next year (2011), but only in demo class. Is the KTM mini a big enough step up or will he be wanting more bike within a another year. Or would you go the SX Jr which he may struggle with for the first 6 months, mainly cause of extra height?