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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: jiggseob on March 17, 2025, 09:38:17 PM
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I installed a new Shinko 712 on my K75 rear wheel. The rear wheel bolts onto the final drive with 4 bolts like a car, with a sleeve-fitted hub.
My motorcycle wheel balancer has centering cones that fit the bearings on either side of a typical front or rear motorcycle wheel. The hub area of a monolever Brick rear wheel has a 16mm hole on one side, but no place for the centering cone to fit the other side. The rear wheel does have a machined hub-sleeve that fits onto the final drive. The inside diameter of that hub sleeve is some 36mm, much larger than the centering cones provided with my wheel balancer.
My neighbour has a 3-D printer, so I used it to print a centering cone to fit the 14mm shaft of my balancer, and has a tapered cone from 30-40mm, to fit the 36mm sleeve on the wheel.
Worked like a charm. Balanced the wheel, sticking-on the weights as required until it is balanced, 1-1/4 oz in the form of five 1/4oz weights. Then, dismounted the wheel from the balancer shaft, and then remounted the wheel onto the balancer, and spun it to check balance. Still balanced. Dismount and remount on balancer shaft again, check, still balalnced.
Bolted wheel onto bike, all that remains is a road-test, waiting for a couple feet of snow to melt.
What made it work was the ability to create a centering cone to fit the 14mm shaft of the balancer, and taper to the 36mm diameter of the hub-sleeve on the wheel. If I had a lathe and a block of material, it could have been done out of metal; aluminum or steel. If I was a really precise wood-turner, I could have turned it out of hardwood. With what I have on-hand, and what I am capable of, I drew it up in a CAD program and 3-D printed it.
I will post my .STL file to the 3dPrinting and CNC repository and to Thingiverse.
https://www.thingiverse.com/thing:6983188
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For anyone interested, Marc Parnes makes a wheel adapter that works with his regular balancing kit.
Frank
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Thanks for the writeup and file for those who want to replicate.
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For anyone interested, Marc Parnes makes a wheel adapter that works with his regular balancing kit.
Frank
112350
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For anyone interested, Marc Parnes makes a wheel adapter that works with his regular balancing kit.
Frank
Yup. Have had one for years. Great setup.
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I just browsed through Marc Parnes' page. Fascinating read, especially the "A life of bikes" sub-page.
Thank you Mr. Parnes, for your decades of contribution to motorcycling.
http://www.marcparnes.com/