Description The Robert Axle Kid Trailer Axle KID211 – 174 or 180mm x 1.75 will allow you to attach a hitch-mounted trailer to your bike. This 12mm thru axle from Robert Axle will fit any trailer that has two wheels & a single point of attachment. Including all the two-wheeled child, pet and cargo trailers from Thule, Chariot, Burley, Instep, Carry Freedom & more. Robert Axle want you to share your love of cycling with your kids. Their axle’s will allow quick & secure attachment of your trailer to your favourite bike. Your stock thru-axle is not strong enough to haul your precious cargo! Robert Axle’s are 3 to 4 times stronger than the stock axle that came with your bike. Their stainless steel axle ends will provide a safe and secure attachment point of the hitch to the axle. The axle is quick to install and remove with a common 5mm hex key. Kid Trailer Axle KID211 – 174 or 180mm x 1.75 Specs: This axle is compatible with Burley, Carry Freedom, Chariot/Thule, Croozer, Instep, and many more hitch style trailers. The true length of the axle shaft is 180 mm, but can be shorted using the included 6 mm spacer for lengths of 174 mm or 180 mm. Please note: Thru-axle lengths do not equal hub standards. An axle has to be longer than the hub to fit in the frame. A 12×148 hub does not equal a 148 mm long axle. This axle has a 1.75 mm thread pitch. The axle shaft and axle end are precision CNC machined. The axle shaft is 7075 aluminium and hard black anodized for rugged durability. The axle end is stainless steel, which allow for mounting of the hitch provided with your trailer. The threads are M10x1 (metric). Hardware for attachment of the hitch is included; the hitch is not. No special tools required. Design allows for installation or wheel removal using your standard 5mm hex wrench. Designed, built and quality tested in the USA. Proven around the world. Not sure how this axle system works? We can help! We stock these axle’s in our Bicycle Repair Shop in Richmond & can help you figure out what you need.