Helmet Heads

The kids have gotten into their bikes this summer so it was about time they got some helmets. But now I have just a few problems: The week after we got the helmets Peter accidentally backed over Makenna's bike and has some spokes sticking out all weird (un-rideable); Porter wanted his training wheels off, but he still can't ride on his own and now we can't put the wheels back on because some parts to his training wheels are missing; finally I think the tubes need replacing in Charley's bike. UGGHH! Bike GODS please help me! They do look pretty cute though!