Technical Information Pages for the Restoration of the BMW R75 and Zündapp KS 750.
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The Steering Head Bearing
The steering head bearing is one of the few bearings that was fit in the BMW and Zündapp and that was not a standard bearing to DIN standards.
With an inside dimension of 32 mm and an outside dimension of 53 mm it cannot be replaced by any commercially available DIN bearing.
All commercially available bearings cannot be altered to fit.
Here a new steering head bearing should be mounted.
Quite often the bearing is only given a minor role.
The old bearing is examined and it does not seem to look too bad.
Now you make the first mistake. The bearing is pulled out to examine it closer and clean it.
As the steering mechanism is mostly on straight running
stabilty while driving,
the ball bearings hit more or less into this position over the years.
When they are finally strongly and palpably in this position the steering head bearings have to be replaced
Is the wear and tear only slightly, I mean not palpable, then you can continue to use the steering head bearings. (But may be the previous owner has already made this mistake)
However, when I take the steering head bearings out, clean them and put them back in again, then the upper and the lower bearing shells will never be mounted in the same position as before.
The ball bearing cannot decide if it puts itself in the upper or lower position.
This makes itself felt as a strong flutter on the handlebars.
The fluttering of the handlebar has nearly almost bad steering head bearings as a cause.
1. old bearing never been taken out 2. old bearing taken out and put back in again 3. new bearing
I can only advise you to change the steering head bearing always when you make a restoration.
Steering head bearing Article no. 3158
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