This is one of the dumbest things I bought for a kid, but he loved it.

It basically adds a fake exhaust to a bike and uses a cardboard card flipping against the spokes to make an exhaust like sound from a peddle bike.

It's really as dumb as it sounds, but kids love it and it is pretty fun to watch them drive around with it. It's kind of like putting a loud muffler on your first car. Most teenagers have done it, this is the same thing but for much younger kids.

The exhaust acts like a megaphone and the included cards create the sound effects. The kit includes 3 different cards for three different "motorcycle sounds" and some stickers. Installation is really easy and kids will love it.

Turbo Spoke review

You can find the kit on Amazon for $20 shipped.

_{All images are from Amazon product pages}