Weird popping noise from back wheel (Solved?)

[billg69gmc]

I was going to add to also use an automotive stethoscope  and try to isolate the sound. I'm hearing a thump and a click. The stethoscope could isolate if the tire is in question or possibly another sound just coming thru the tire. Weird!

[Capo]

^That doesn't make sense.^ 

If the wheel is turning, then the axle is turning, and the bearings in the eccentric are turning.

Put your bike on the stand and look at while you rotate the wheel.
Thats why the SSS stands have bearings in them

[A.duc.H.duc.]

Put your bike on the stand and look at while you rotate the wheel.
Thats why the SSS stands have bearings in them

That's true, but the hub is still loaded, because the weight of the bike is still supported by the swingarm. The rear stand only supports the wheel, not the swingarm.

[EEL]

Theres one surefire way to find out. Anyone local to the bay area got a 5 spoke marchesini sitting around that I could swap for a minute to test out my theory?

[DarkStaR]

Put your bike on the stand and look at while you rotate the wheel.
Thats why the SSS stands have bearings in them

I give up. 

[EEL]

Capo

Dark is right, I think you are misunderstanding his point. If you put a bike on a SSS rearstand you're spinning the axle AND the bearing on the SSS stand. If you need proof, download my video (link in this post) of my bike on a sss reastand (where it doesnt pop) and you will see that the nut holding the sprocket AND the sprocket itself are spinning. If that is the case the axle and bearings inside the eccentric are spinning as well since the sprocket is directly tied into the wheel. If it wasnt, our bikes would sit in place and never move when we get on the gas.

Either way, the visual proof is on the video. Please take this as fact as othat we can end this side discussion.

The shop that installed the tire is closed today, hopefully I can give them a call tomorrow and get this issue resolved this week. I'll push to get a new tire if its defective.

Again, if anyone has an S2R with a bald tire that they are planning to take off anyways to replace, I'd love to stop by and borrow your rim for a quick garage test. That would settle this once and for all.

[PizzaMonster]

I don't know if this could be the problem or not but it might be worth a look.

http://ducatimonsterforum.org/index.php?topic=3915.0

You did say the wheel was off for tire replacement and this mounting error is easy enough to make.  I suppose the "popping" noise could be the locating pins binding on the wheel as they try and seat into the casting spaces.

Good luck.  Whatever it is it just sounds wrong!

[Capo]

Capo

Dark is right, I think you are misunderstanding his point. If you put a bike on a SSS rearstand you're spinning the axle AND the bearing on the SSS stand. If you need proof, download my video (link in this post) of my bike on a sss reastand (where it doesnt pop) and you will see that the nut holding the sprocket AND the sprocket itself are spinning. If that is the case the axle and bearings inside the eccentric are spinning as well since the sprocket is directly tied into the wheel. If it wasnt, our bikes would sit in place and never move when we get on the gas.

Either way, the visual proof is on the video. Please take this as fact as othat we can end this side discussion.

The shop that installed the tire is closed today, hopefully I can give them a call tomorrow and get this issue resolved this week. I'll push to get a new tire if its defective.

Again, if anyone has an S2R with a bald tire that they are planning to take off anyways to replace, I'd love to stop by and borrow your rim for a quick garage test. That would settle this once and for all.

Indeed this is true, my point is that when on the stand the weight of the bike is on the stand bearing. When you rotate the wheel whilst on the stand, the stand bearing has an influence on how the rotation "feels". I've had the opposite, when on the stand the rotation felt rough but when on a centre stand with the suspension unloaded the rotation felt fine.

I had suggested you unload your suspension (not on the stand)  and observe the rotation of the wheel as a process of elmination as to why it doesnt click while on the stand.

I rather think that incorrect fitment of the rear wheel is the culprit, when you roll the bike, the weight is transmitted through the wheel to the axle wheras when on the stand the weight is transmitted directly to the axle. (another clue is the recent?) tire change.

I would want to be present when the wheel is removed to asses any damage that might have been caused.

[EEL]

Thank you for clarifying. You make a good point. If its the wheel fitment onto the eccentric, this would be totally my fault. Cuz I did the installation. It might be that a one of the 4 pins broke off the carrier for the wheel. That might be the other culprit. Thats the only other item I can think af at this time.

[DarkStaR]

...
..., when you roll the bike, the weight is transmitted through the wheel to the axle wheras when on the stand the weight is transmitted directly to the axle. (another clue is the recent?) tire change.
...

That makes sense. 

[ducpainter]

I don't know if this could be the problem or not but it might be worth a look.

http://ducatimonsterforum.org/index.php?topic=3915.0

You did say the wheel was off for tire replacement and this mounting error is easy enough to make.  I suppose the "popping" noise could be the locating pins binding on the wheel as they try and seat into the casting spaces.

Good luck.  Whatever it is it just sounds wrong!

That would be my guess since it's not the cush drive rubbers.

[EEL]

I'm going to pull off the wheel and take a look. If I misaligned the tabs, I'll find out soon enough. Luckily, I've had no issues with the nut backing out cuz I'm ultra anal about torque specs..
If this is the case, I'm hoping the damage will be minimal..

[uclabiker06]

I don't know if this could be the problem or not but it might be worth a look.

http://ducatimonsterforum.org/index.php?topic=3915.0

You did say the wheel was off for tire replacement and this mounting error is easy enough to make.  I suppose the "popping" noise could be the locating pins binding on the wheel as they try and seat into the casting spaces.

+1

[EEL]

Well I took the wheel off and put it back on. Didnt do anything else..popping noise gone.. Just might have been a locating pin issue and previously reported. Funny part is that when I took the wheel off, The wheel was physically seated in the holes. It wasnt as if it was off in some fashion.. I dunno..so far the issue seems to have solved itself.. Took it for a spin with no issues..

Guess I got lucky..