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Old April 17th, 2019, 06:03 PM   #1
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2013 Hyper rear hub orientation

So I have a question for the masses. There seems to be a discrepancy in the service manual regarding the orientation of the rear hub in the swingarm.

Save a massively long explanation, which I will elaborate on after a bit more fact finding, I need a bit of information from some 2013-16 821 owners.

I need the measurement from the rear tire to the rear fender, basically the vertical gap between the two.

I also need to know if when the chain leaves the top of the 45T (stock) rear sprocket, does it make contact with the chain guard.

If a few owners could chime in with that info, I would much appreciate it.

Cheers,
p3
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Old April 17th, 2019, 06:18 PM   #2
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Don't have speific answers, but maybe this will help. There's also a video based on this thread:

https://www.ducati.ms/forums/80-hall...ntric-hub.html
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Old April 17th, 2019, 08:01 PM   #3
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Originally Posted by appliance821 View Post
Don't have speific answers, but maybe this will help. There's also a video based on this thread:

https://www.ducati.ms/forums/80-hall...ntric-hub.html
Thanks, I have seen that one already. I am trying to determine the orientation of the hub when it gets installed; axle at the 12 o'clock or axle at the 6 o'clock position.

I thought I finally had it figured out but the drawing in the Hyper service manual is contradicted by the text in the manual. So I installed mine with the axle at the 12 clock position as the drawing in the manual shows. Installed the chain today and found the adjustment for tension is exactly backwards from what the manual states. I go clockwise (sprocket side) and the chain gets tighter. Manual says clockwise should be looser when viewed from the sprocket side. That would make total sense if the hub had been installed with the axle at the 6 clock position.

The issue is the service manual drawing appears to be opposite of how the text describes the installation. I followed the drawing and it appears that it is incorrect.

So, with my axle at the 12 clock position, I have about 3/8" clearance between the tire and the rear fender and as the chain comes off the top of the stock sprocket, it heads downhill toward the front sprocket. The chain is about 1" from contacting the chain guide at the rear most point.

So, looking to see if others who haven't ever removed the rear hub show more tire/fender clearance and the chain contacting the chain guide which would be indicative of the axle needing to be at the 6 clock position.

Thanks
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Old April 17th, 2019, 09:47 PM   #4
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It actually is up to you depending on if you want to raise or lower the geometry. From what I recall the stock position is 12 oclock because rotating the adjuster clockwise tightens the chain.
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Old April 18th, 2019, 01:06 AM   #5
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The eccentric hub should nominally set the axle between the 4 and 5 o'clock position (viewed from the left side). But you can also obtain the proper chain tension when the eccentric is in the wrong position - with the axle set between the 1 and 2 o'clock position. If it is set higher than the 3 o'clock midpoint, there will be inadequate clearance between the lower run of the chain and the swingarm and the rear ride height will be too low. You'll also have inadequate clearance between your rear tire and hugger clearance so it'll rub.
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Old April 18th, 2019, 06:36 AM   #6
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See two comments above from kuksul and mentalist. I can confirm that rotating the hub clockwise (opposite to how the tire turns when moving) tightens the chain.
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Old April 18th, 2019, 07:19 AM   #7
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This is taken from the workshop manual, also this is how mine is set up. Clockwise to loosen when viewed from chain side.
Attached Thumbnails
2013 Hyper rear hub orientation-hyper-chain.jpg  
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Old April 18th, 2019, 07:37 AM   #8
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Originally Posted by mentalist View Post
This is taken from the workshop manual, also this is how mine is set up. Clockwise to loosen when viewed from chain side.
Yes, this is exactly what I was talking about. BUT, if you look at this drawing and the verbiage taken directly from the manual, it is in direct contradiction to the above.

I installed my hub as per the drawing (putting the axle in the upper half or 1-2 clock position). Upon installing the chain and sprockets, I realized that the tighten/loosen is backwards from the picture Mentalist attached, which I also saw in my manual.

Thus I went back to the install drawing and have carefully read and re-read the wording and I believe the drawing is opposite of what they are describing. The wording wants the horizontal axis of the hub hole below the horizontal axis of the hub seat (axle in the lower half or in the 4-5 clock position) but it appears the drawing shows the reverse, which is wrong.

Yes/no? Thoughts? Or maybe someone can explain that I am interpreting this all wrong.

Many thanks in advance for those of you chiming in.
Attached Thumbnails
2013 Hyper rear hub orientation-image-4-17-19-4.12-pm.jpg   2013 Hyper rear hub orientation-image-4-17-19-4.13-pm.jpg  

Last edited by pilot3; April 18th, 2019 at 07:38 AM. Reason: addition
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Old April 18th, 2019, 08:03 AM   #9
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Hi Pilot, yes your reading it right, it describes having the center of the eccentric hole lower/below the horizontal of the hub seat.
The picture shows it above though.
the pic is also taken view from the right side.

I've just removed and cleaned my hub a couple of weeks ago, I'd go and take pictures of how my eccentric is sitting, but i'm away from the bike for another week

Last edited by mentalist; April 18th, 2019 at 08:17 AM.
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Old April 18th, 2019, 08:14 AM   #10
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Pilot, if you have it set wrong you will see straight away, the ride height will change, it will sit more upright on the side stand and you will notice the clearance issues with tyre on the hugger and chain relation with the swing arm.
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