Training Wheels Accessory Kit | Fits Models TT250 & TT350 Sale! from $79.95 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. This aftermarket training wheel kit bolts on to your stock Burromax bike. It will fit on either the TT250 or TT350 model bikes. This is a great gift for the little kids starting out.