The Robert Axle Kid Trailer Thru Axle is the solution for being able to hitch your kid trailer to your bike. Compatible with Thule, Chariot & Burley. Take your kid on your bike rides! Robert Axle call this ‘Tykepacking’, which we think is pretty cute. Kid Trailer axle’s replace your bikes existing 12mm thru axle with one you can attach a trailer to. These axle’s work with just about any trailer, if you have a Thule, a Chariot or a Burley, RAP axle’s will work. Replace your bike’s stock axle with a trailer compatible axle, on every adults bike & you can share the load on the ride! Not only are these axle’s handy to leave on your bike even when you don’t need to tow your tyke, they are a top quality axle. RAP axle’s are stiffer and have threads machined to a higher tolerance than your stock axle. This means they are more reliable & durable than your original axle. They will not loosen over time & damage your frame the way a low quality axle can.