Regular readers may remember my bike rack system from a while back:
I knew this system would have its limitations – squeezing 5 bikes into 4′ of horizontal space is never going to be ideal – but it started to annoy me pretty quickly, and I was scraping pedals/chainstays/spokes every time I took a bike in or out.
So I decided build something similar but where the hooks could be easily slid across while loaded, to make a bit more room to get one in the middle in or out. I knew unistrut was the way forward having seen a few ideas on here, so ordered 3 1.25m lengths of 21x41mm (about £27 delivered off eBay).
I thought finding bearings the right size to go in the channel would be easy, but having worked out the maximum diameter to fit in the slot, the minimum to contact top and bottom lips for stability, and the maximum thickness to allow for a fastener, I couldn’t find anything. I considered some PTFE or nylon blocks as linear bushes, but they were going to work out quite expensive cut to order, and I wasn’t sure how well they’d work. Eventually I found these nylon wheels with a 626 bearing on Aliexpress, which looked the perfect size. £13 delivered for 10, so I hit order and waited patiently.
In the meantime I thought about how to mount the rails. The board I’m mounting this to is a divider at the front of my garage which creates a seperate area for the bikes and keeps sawdust, swarf, etc. off them. But it hinges out of the way in case I ever need to get something large into the garage (which is also the access to the back garden). So I didn’t want to just screw them on, but I also didn’t want to have a joint in the middle where the “wall” hinges, and keeping the unistrut in one piece makes the whole thing more rigid. I also needed to not foul the rollers carrying the hooks.
I decided the solution was some “saddle” type clamps, one at each end, so the strut can slide out without removing them. Had a rootle in my box of scra-, sorry, valuable materials and found some box section that fitted two widths of unistrut neatly, so I sliced it down the middle and welded some plate on each side:
(I could have MIGed it in half the time, but it was a good excuse to practice TIG)