Workshop Rebuild

To remove the last few bearings from the BMW R100 final drive, a set of specialty pullers are required…
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The needle bearing comes out first with very little effort, followed by the radial ball bearing located behind the ring gear.
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The large oil seal is then pressed out of the cover, allowing all components to be laid out on the table for inspection.
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Two issues immediately caught my attention, one being the front needle bearing race.
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It appears to have shifted over time and has started contacting the inside of the final drive housing.
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If left as is, it would continue to wear and eventually introduce metal debris into the bearing.
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In the previous video, I found a small piece of steel that may have passed through the gears, as there is slight discoloration visible on a few teeth.
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There is no major damage, but it could have turned into a much bigger issue.
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Now it is time to wait for new parts, thoroughly clean everything, and prepare for reassembly.

Before tearing down the BMW R100 mono final drive, I needed to clean it up and capture scan data first.
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Those files let me bring everything into a digital assembly, dial in exact fitment, and start prototyping with confidence.
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Since this final drive will get a few tasteful modifications, I want full control over how the rear wheel hub looks.
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I’ll model different designs, print them, and test-fit each version on the rear end.
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It’s a small step that will have a big impact, not just on this build, but on how future customs of mine take shape.