Very strange, just pulled wheels off and had brand new tires put on and on the test drive noticed a very noticeable thumping sort of vibration at 32-38 mph........... immediately thought it was the rear tire because you can feel it, and feel it in the foot pegs....... but it's only in 3rd gear, if you shift to 2nd or 4th it is completely gone at the exact speed..... smooth up to 32mph, smooth after 38mph........ only 3rd gear.

Any ideas?

HHmmmmm....."new tires put on"....okay.Here's something you can try to just rule this possible out.REMOVE your rear wheel weights.Try that.See what happens.I know...sounds dumb...but....

Do you have a rear stand?Put er up on there and make sure EVERYTHING is where it's supposed to be...spacers,chain run,rear caliper mount bolts.Spin the tire.You didn't MAYBE(another dumb question here)have your toe on the rear brake pedal possibly and didn't notice it?Stranger things have happened .Axle lined up right?Chain well lubed and free running?

I've noticed SOMETIMES....my bike has displayed a symptom of something...after I've done something with it or whatever...and the "symptom" will be completely UNRELATED to the initial deal.Just a weird coincidence.It happens.You changed and removed the wheels,or someone else?

I don''t know anything about torque values in different gears.You say in 2nd and 4th,it doesn't do this.But in 3rd,it will.MAYBE,there's a strange "torque" going on just enough to create a vibration in 3rd?IDK.Still...it shouldn't be doing this at all...no matter what gear yer in.The tire IS okay,yes?You inspected the tread carefully,right?No strange formation under the tread or anything?Carcass is appearing fully attached to the tread?Any bulges anywhere...even a slight one maybe?

* Last updated by: blue07 on 7/15/2011 @ 7:59 PM *