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

appliance821 said:

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-wisdom/229785-replacing-bearings-sssa-eccentric-hub.html

Click to expand...

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

mentalist said:

This is taken from the workshop manual, also this is how mine is set up. Clockwise to loosen when viewed from chain side.

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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.

mentalist said:

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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Now, with the hub clocked in the upper 1-2 clock position, I have only about 3/8" clearance between the hugger and tire. I have not ridden it yet as I was just getting the chain and sprockets sorted when I discovered this.

The bike was new to me in Dec, I never rode it before this so I have no comparison. So that was why I posted to see if someone had the hugger clearance measurements to guide me.

If a non-molested bike has similar clearance to mine, then I would have to believe that the drawing posted above is correct and the text description is wrong. Although if that was the case, then the adjustment directions in the manual are also wrong.

If someone has clearance closer to 1"+ between the tire and hugger, then I would have to believe the manual drawing is incorrect and all the written descriptions are correct, which means I need to rotate my hub and clock it in the 4-5 clock position.

I also tried my local Ducati dealer who just told me their lead Duc mechanic quit recently but they have "some other guys" who would look at it. This dealer is not exclusively Duc so you can see my hesitation without them having a specific Duc tech anymore.

edgary said:

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.

Click to expand...

mentalist said:

This is taken from the workshop manual, also this is how mine is set up. Clockwise to loosen when viewed from chain side.

Click to expand...

These two posts also conflict, respectfully to both of you, as I know you are just reporting how your bike is set up:

edgary has his bike most likely clocked like mine is now, axle in the 1-2 clock position. Thus clockwise rotation tightens the chain as the axle moves back and down toward 3 clock. Based on his description of clockwise, opposite to how the tire turns when moving, I surmise that is clockwise on the left (chain) side of the bike.

mentalist has his bike clocked as the written word in the manual describes, axle in the 4-5 clock position. As he rotates the hub clockwise, the axle moves down and forward, thus loosening the chain which is exactly how the manual describes.

Would this all not have been easier had Ducati embossed an arrow for UP on the damn hub?

OK that was great info, thanks. After all this, a buddy of mine sent me a photo I texted him while I was in the teardown phase of all this. It answers where the hub was before I ripped it apart but unfortunately, now I think the last Ducati tech to work on this put it together wrong potentially.

It is clocked with the hub in the upper half, 10-11 clock position in the photo from the right side, which would put it in the 1-2 clock position from the left (chain) side.



In this position, all the tightening directions are opposite from how the manual states they should be. I guess my next step is to pull the wheel and backing plate in order to try to rotate the hub to the 4-5 clock position and see what it looks like.

I know if it is clocked at 1-2, the rear will be lower and it will slow the handling and require more bar pressure in the turns. Not exactly what I am after.

mentalist said:

No your wrong, with the hub set lower the chassis is higher and will steer faster.
Unless I'm reading above wrong lol

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No, you are correct, I just made my comment based on how it is now. I have the hub clocked with the axle at 1-2 so lower chassis and steer slower. (I see why the confusion and I corrected my prior description)

Your way, hub lower (4-5) clock for the hub hole, chassis higher and steer faster.

I just want to realize how this was supposed to be set initially.

My photo just got posted so you can see it was clocked hub high, but there is no assurance it is correct since a tech was in there at one point and could have done the same as me and followed the drawing in the manual. All I know is clocked in the way it is in the photo, the chain adjustment is exactly opposite of how the manual says it is supposed to be.

edgary said:

I just went out and measured mine. Distance between the tire and the cover is 0.75"

Mine tightens if you rotate clockwise. I don't think the hub has ever been replaced, but I'm not positive since I bought it used.

[edit] I tried to add a picture of the measurement to make sure it's what you're asking, but it wouldn't add it, so maybe try https://photos.app.goo.gl/Ah4bwvbRmFeqsGMz9

Click to expand...

Thanks for the photo. Mine also tightens when the hub is rotated clockwise from the right (chain) side of the bike.

pilot3 said:

OK that was great info, thanks. After all this, a buddy of mine sent me a photo I texted him while I was in the teardown phase of all this. It answers where the hub was before I ripped it apart but unfortunately, now I think the last Ducati tech to work on this put it together wrong potentially.

It is clocked with the hub in the upper half, 10-11 clock position in the photo from the right side, which would put it in the 1-2 clock position from the left (chain) side.



In this position, all the tightening directions are opposite from how the manual states they should be. I guess my next step is to pull the wheel and backing plate in order to try to rotate the hub to the 4-5 clock position and see what it looks like.

I know if it is clocked at 1-2, the rear will be lower and it will slow the handling and require more bar pressure in the turns. Not exactly what I am after.

Click to expand...

I also just realized from this photo that directly above the axle hub hole is the mounting tab for the ABS sensor. I believe if I were to pull this apart and rotate the hub down so the axle was clocked in the 4-5 position, that mounting tab would no longer clear the top of the swingarm.

I think I am realizing that the manual is most likely wrong in how it describes which direction is tight and loose for rotating the hub.

Was in mentalist who had the tight/loose correct as the manual? If so, I'll probably need to wait until he gets back to his bike for a pic.