SOHC.co.uk Forums > CB350/400
Rear disc conversion
Bryanj:
Cant tell you the bolt size, might be able to measure a collar if its the same as a 500 one
allankelly1:
No worries
I will strip it out this weekend and put a plan together as bike is now drained down for the winter
Al least it at taper bearing that in my mind is the best set up as the bearing cope with both axial and radial loads
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allankelly1:
--- Quote from: Oddjob on November 10, 2021, 03:41:21 PM ---Original is 14mm.
--- End quote ---
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K2-K6:
I can't see a problem running them without a spacer (the taper roller Dresda design) it's as he designed it with significant background and real testing of those design in competition.
If the arm and bearings are a tight fit in the frame (you may have to undo the rear engine mounts if they pull the frame in) then the spindle can be torqued to 25lb/ft with them free floating. They are designed to take axial load in that way without any problems at all, generally people have been squeamish about torqing them as such which may lead to problems.
They are not like a wheel bearing joint in that the load is mostly radial on those, with very little pure axial demand. A internal spacer would be used if you wanted to put much higher torque load on the threads, such as a differential pinion assembly in which the bearing preload is high to prevent axial shunt, also the securing threads high torque demand such that it doesn't loosen in service life.
The swing arm bearings have a comparatively easy life and some preloading will help maintain positional accuracy under road conditions.
The design does a very clever balance of forces in that location, being very able to resist the expected input while remaining so very simple.
He placed the bearings right out by the frame, giving them the easiest task possible to resist frame torsion load (if you look from the back of the bike and tried to rotate the top of the wheel one way, with the bottom across the other way) but by using roller bearings if the arms move such that it twists the main pivot tube in it's own torsion, then it can't lock up as plain bearings risk doing from that tube twisting.
K2-K6:
Interestingly, there's some information about standard 400 swing arm in FEA program on this link http://www.denoonsp.com/bimota-7.htm along with some other modifications on a 400 on the site.
Hasn't got a disc conversion like yours though Alsn :D
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