BMW K bikes (Bricks)

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1Back to top Go down   swingarm width Empty swingarm width on Fri Nov 20, 2020 11:00 pm

arbalest

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Does anyone have the actual width, in mm, of the K100 swingarm, bearing face to bearing face?

    

2Back to top Go down   swingarm width Empty Re: swingarm width on Sat Nov 21, 2020 4:48 am

chris846

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310mm by eye with a tape measure. If you need it more accurately let me know.

FYI the swingarms on the oilhead boxers (R1100/1150) are the same, just a lot longer because the engines are much shorter.

swingarm width 001_311


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3Back to top Go down   swingarm width Empty Re: swingarm width on Sat Nov 21, 2020 5:05 am

chris846

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MILLIMETERS??

Do you want me to send a ruler across?


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4Back to top Go down   swingarm width Empty swingarm width on Sat Nov 21, 2020 10:10 am

arbalest

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My ultimate goal is to use the K100 swingarm in a single sided leading link front end for my R90/6 rig. I will use a hub bearing assembly bolted to a bracket to bolt to the drive end of the swingarm, with spacers to adjust the trail. I also have a K100 swingarm being modified to fit the R90 frame. The driveshaft was modified to mate to the airhead transmission output flange. I had this done years ago (by Bruno's in Canada), before you could buy an adapter spline. With the stock 2.91 final drive and a 175/55 R15 auto tire, I come close to an effective final drive ratio of 3.33, which is reasonably close the the 3.36 I currently have.

    

5Back to top Go down   swingarm width Empty swingarm width on Sat Nov 21, 2020 10:19 am

arbalest

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Chris, I have seen several examples of airheads using the R1100 - 1150 swingarms and the now available adapter spline. The airhead swingarm is considerable narrower than the K100 swingarm. I wonder how they make this work.

    

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