Description The Robert Axle BOB Nuts – 3/8-26 – ADA127 will allow you to attach to your BOB trailer or any other hitch-mounted trailer to your bike. The BOB Trailer is the OG & the best trailer out there, so if you are lucky enough to own one, this adapter is a lifesaver! The adapter threads on to axles with an 3/8 – 26 thread & is compatible with all BOB trailer models. Double check your axle’s measurements or specs to be sure this is the model you need. This information is sometimes printed on the axle itself, or can be found on the specifications for your bike model online. Like all of Robert Axle’s components this adapter in incredibly durable & long lasting. Making these BOB Nuts from stainless steel with a wrench fitting means that your trailer & your precious cargo is as secure as possible. The Bob Nuts have been designed to easily clear hooded dropouts and other interfering dropouts. They are easy to install. Simply replace the existing nuts with our adapters, and attach the bobbins that came with your trailer. Need Bobbins for your trailer too? Find them here. Robert Axle BOB Nuts – 3/8-26 – ADA127 Features & Specs Hubs which have the 3/8 – 26 axle: Shimano Nexus, Shimano Alfine, Shimano Coasting. Compatible with all BOB trailer models Sold as a pair Robert Axle Part no. ADA127 Stainless Steel construction Fitting requires a 17mm wrench If your bike has a 12mm thru axle, you can replace your axle with a trailer specific version from Robert Axle. Use the Axle Finder on our site to determine which one you need for your particular bike model.