yeah, you get them at bike shops. Are there no bike shops in your part o' the world? The trailers, you know, the yellow ones, generally hold 100+ pounds of kid. So your kid doesn't need to be THAT small. I've not used either of these devices, but thought about both. I have a very small 5 year old, I don't know if she'd be confident & steady enough for one of those 3rd wheel trailers. We have a bike shop here in Portland that will actually rent those things out to you for a day. A very good idea as you can see how they work for you. You also might be able to find them used for a much better price than new. Erika >My husband wants what I'm going to call a 3rd wheel for his bike so >the 4-year-old can pedal along behind him at the parks and forest >preserves around here.