head angle bearings - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 9 (permalink) Old Jul 24th, 2019, 1:47 pm Thread Starter
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head angle bearings

Couple of my race buddies have some stem bearings in their SS that change the head angle. Issue is they know nothing about them or where they came from.

Google hasn't been much help. anyone have any insight into these steering stem bearings?

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post #2 of 9 (permalink) Old Jul 24th, 2019, 2:01 pm
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Pic?

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post #3 of 9 (permalink) Old Jul 24th, 2019, 3:06 pm
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Ahhhh the much rumored offset head bearings everyone has heard of but no one knows the seller of. I have heard of these for about a decade so I hope they never need replacements or someone finds the guy!
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post #4 of 9 (permalink) Old Jul 24th, 2019, 4:40 pm
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i always wondered how you'd orientate them accurately. otherwise it'd be angled off to the side.

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post #5 of 9 (permalink) Old Jul 24th, 2019, 5:30 pm Thread Starter
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I will have on of the bikes in the shop this weekend, ill get a chance to inspect them.
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MotoAmerica #600 / CCS-ASRA #60
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post #6 of 9 (permalink) Old Aug 24th, 2019, 3:39 am
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Maybe larger bearings ID with a concentric shim.
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post #7 of 9 (permalink) Old Aug 24th, 2019, 5:12 am
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Quote:
Originally Posted by xracer View Post
Maybe larger bearings ID with a concentric shim.
Or small bearings OD with a concentric shim on the outside. It would pretty much have to be that way. If they were large ID with an inside shim, the forks would sortof ~spiral~ around as the bars were turned.

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post #8 of 9 (permalink) Old Aug 25th, 2019, 9:43 am
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Ever get a look at the mystery bearings?
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post #9 of 9 (permalink) Old Aug 25th, 2019, 8:15 pm
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The MotoAmerica team I used to work for had them in his R1. We had .5 degree and 1 degree. We used a smaller OD bearing vs stock and pressed in aluminum cups to the steering head. The new bearing pressed into the cups at a slight offset forward on the top bearing and a slight rearward offset on the rear. They were custom machined, and they could not be a universal part. The height of the steering head dictated the slight angle needed to be machined into the cups along with the offset forward or back. Most modern bikes now use oversize head to allow for this. Check out the new V4, so many hidden options for the factory boys. Not only rake change but wheelbase too.

On the R1 there were simply tick marks on the inserts to show centerline front or rear. The Ducati V4 uses notches as shown in this pic.

Makes sense?

CanCreek also makes something similar for bicycles called an angleset. However it uses a conical seat to allow for various frame sizes. It clunks alot and is not a good way in my opinion

I run a rear shock from a DS1000 on my 900 that is a little bit longer and steepens the rake about .5 degrees and I like it. This also reduces the trail a little, probably closer to 100mm but I never measured it as it's just a street bike.
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