2014 STS belt vibration between 55 to 65 mph - which belt dampener? Top or bottom?

[Oldraceman]

I have read some on this subject didn't seem to affect mine until I had to have the rear tire replaced. With covid rides were short and not at any highway speed until this week. I noted now that between 55 to 65 I feel a vibration near my left foot. I've been looking for a belt dampener that can be installed on the ST model. Any Ideas? Please help?

Second thought, is it better t run on top of the belt or on the bottom? I was thinking bottom since this should be the loose side while running. Thanks for any help...

[BLUEKNIGHT911]

I have read some on this subject didn't seem to affect mine until I had to have the rear tire replaced. With covid rides were short and not at any highway speed until this week. I noted now that between 55 to 65 I feel a vibration near my left foot. I've been looking for a belt dampener that can be installed on the ST model. Any Ideas? Please help?

Second thought, is it better t run on top of the belt or on the bottom? I was thinking bottom since this should be the loose side while running. Thanks for any help...

I cured my drive BELT vibes by lowering the Belt tension from BRP specs to 160 lbs measured with the wheel on the ground .... using a KritKit guage (see BAJARON) ........ Mike

[Peter Aawen]

- I'd be checking the Belt Tension before doing anything else, cos if it was fine before, and now that you've had someone else replace a rear tire it's suddenly got 'a vibration near your left foot'.... it can really only be being caused by the tire itself, the wheel balance (unlikely with a single rear wheel) or there's something different in the way the belt/rear wheel is set up - and who knows what the belt tension is now?!?

There again, at the risk of sounding like a cracked record (some of us here will be old enough to remember that sound, while more of us should be able to remember what a 'record' actually is! ) if you've fitted a new OE Spec Kenda on the rear, there is also a reasonably high chance that IT is the source of the vibrations you are now experiencing!! No kidding, they really can be that bad!

But check the belt tension first, setting it to something like that suggested above; and if that doesn't resolve your vibration issues, then I'd seriously be looking at your 'new' rear tire as the only other thing that's changed lately!

[2dogs]

BK911 and Peter gave excellent advice. While you have the rear of your spyder up off the ground hand-spin the rear tire slowly and check it for out of roundness.

[frenchbz]

I got mine from Smooth Spyder to stop the clutch chatter on my 2015 ST Limited. It went on the bottom and helped greatly. The chatter was totally eliminated when I started buying my oil change kit from Lamonster Garage.