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[Moto7575]

Well klosterman is sold specificially for belts, so we can assume they would be dead by legal claims if it damaged the belt...

[ESokoloff]

I will make one comment about the groaning noise:  My 2018 S groaned loudly when new.  But after a while it quieted down and around 1000 miles the noise went completely away.  Either that or I got used to it.   

I have to think that it's the belt & not the bike.

Just this week I changed the belt on my 16DSR after shearing off many clogs.
My fault. About 19k miles on it & it happened.
Zero recommendations is to replace at 16k mikes.

Anyway, it's been quite wet here in SoCal & I had noticed that the old belt was making the  notorious browning noise while wet from the rain yet silent when dry (I wear earplugs so silent is relitive).
The new belt is VERY noisy however and it hasn't even seen rain yet
I noticed that this new belt was vey glossy as compared to the previous belt when it was new so perhaps there was a change in the manufacturing process?

[DonTom]

The new belt is VERY noisy however and it hasn't even seen rain yet
I noticed that this new belt was vey glossy as compared to the previous belt when it was new so perhaps there was a change in the manufacturing process?

Are you sure you have the new belt aligned properly? About 1 MM (or at least a credit card space) on the very left side of the wheel sprocket.  I know the belts can make noise if they are out of alignment.

-Don-  Auburn, CA

[ESokoloff]

The new belt is VERY noisy however and it hasn't even seen rain yet
I noticed that this new belt was vey glossy as compared to the previous belt when it was new so perhaps there was a change in the manufacturing process?

Are you sure you have the new belt aligned properly? About 1 MM (or at least a credit card space) on the very left side of the wheel sprocket.  I know the belts can make noise if they are out of alignment.

-Don-  Auburn, CA

The belt is not rubbing on the rear sheave/pulley edge.
There is adequate clearance.
It's the groan of the stretching of the belt.
The older one did it wet.
The new one does it dry.
It rained today & I was on the road soon after it stoped raining but the roads were still wet.
The belt actually seemed to quit groaning while wet.
Just the opposite of the previous belt

I check/adjust my belt around the first of each month.
Here is my notes on belt adjustment...
(This on a 16 DSR)

20-30kg tension via Gates krikit https://www.amazon.com/Gates-91107-Belt-Tension-Tester/dp/B000MUTAGS/ref=sr_1_1?ie=UTF8&qid=1549857086&sr=8-1&keywords=krikit+belt+tension+gauge
Jacking left screw(bolt) out (adding tension) moves the belt to the right.
Best to get the belt in the correct position (left/right) then adjust tension.
NOTE: Position belt with a right side biases as it will shift to the left when the axle bolt is tightened.     
Must use rolling head prybar to pry the right side towards its jack-screw (or just Smack the tire/rim in the desired direction)
Spin the wheel several times after an adjustment to allow the belt to settle down & find its new position.
NOTE: 1/6 turn of Left jack screw appears to cause a 10KG difference to tension.
Use 1-1/16" socket to tension axle nut to 102NM (75#/') when compleat (I don't have the correct Metric socket but found that 1-1/16" is close enough to work).
P.S.  Recomend first removing each Jack bolt & grinding down the raised print on the heads to prevent digging into the soft aluminum of the swing arm.
Also apply some anti-seize to the threads before re-installing.

[BamBam]

I think keeping the belt tension at the low end of the range also helps make the belt quieter.  I keep mine a little below the low end range.  I've never had a problem with keeping the belt on the looser side.

[BrianTRice@gmail.com]

I've updated the wiki to reference this thread for reading:
https://zeromanual.com/wiki/Belt_Groan_Sound