Description The BOB Trailer Bobbins BIN001 are made by the Robert Axle Project to complete their axles for compatibility with the BOB Trailer. Keep in mind it is always a good idea, on any significant tour, to carry a spare Bobbin and Trailer Pin. Just in case! We have the BOB retaining pins here. Looking for the complete axle to make your bike compatible with your trailer? We stock BOB trailer thru axle’s from Robert Axle to achieve this. Use the ‘Robert Axle Finder’ to enter your bike’s details & it will tell you which axle you need. It’s a lot easier than trying to figure out the axle specs yourself! Robert Axle have a comprehensive list of the specs of just about every bike on the market.