What could this weird fender vibration when braking be?

[BajaRon]

Ron, those were EBC MD853 rotors

Interesting, they were existing before the wheel work?

 

[arkyleo]

I recently had new tires put on my 2022 RT Ltd, Vredestein Quatrack 165/60R-15 on the front, 215/60R15 rear.

I've ridden it for a couple hundred miles with no issues, but today was a very quiet day, (no wind noise to speak of, and I had the radio off) and when I brake, I noticed I can hear a dull vibration sound. It sounds like a kid making a motorboat sound by purring their tongue or something (yeah, hard to describe), and I can see the left fender vibrates forward and back slightly. I can feel the vibration when I put my left boot against the fender while braking.

I can't feel anything actually loose by just pushing/pulling on the fender when stopped. It feels just as solid as the right fender.

Any ideas what it could be? I've never taken the tires off myself... it was done at a powersports shop that is familiar with Spyders. Just not an actual Can-AM dealer. Maybe it's normal and I just never noticed it, but I'd think I'd have heard it sometime if that was the case.

You are not alone my friend on the front wheel vibration. Almost the same problem on my2021 RTL--left front slight shudder vibe felt only when braking around 30-40 mph. I changed both rotors and pads (EBC), new verdstiens such as yours, had both wheels spin balanced and there is STILL a slight vibration. Torqued nuts to spec (in steps as always). I will re check and carefully inspect the nut tapers and wheel holes--but if it persists I think I will just ignore it (unless the wheel falls off):sour:

 

[JSRT]

I also had the same issue with a NEW set of EBC rotors this year. Yes, the wheels were properly torqued. The left was worse than the right, but both caused the fender vibration. I contacted the dealer to share my concerns and was told “they have never seen a bad EBC rotor right out of the box.” When I swapped them from one side to the other, the right side now shook the most - so I knew it was the rotors. I handed them to a friend that owns a machine shop to confirm the rotors were not true. He reported similar run-out and thickness variation as reported earlier in this thread. I had an extra BRP rotor so I used the best 2 of the 3 OEM’s and there is little if any vibration noticeable. I was very pleased with EBC’s on a previous Spyder. Very disappointing this time around.

 

[arkyleo]

I also had the same issue with a NEW set of EBC rotors this year. Yes, the wheels were properly torqued. The left was worse than the right, but both caused the fender vibration. I contacted the dealer to share my concerns and was told “they have never seen a bad EBC rotor right out of the box.” When I swapped them from one side to the other, the right side now shook the most - so I knew it was the rotors. I handed them to a friend that owns a machine shop to confirm the rotors were not true. He reported similar run-out and thickness variation as reported earlier in this thread. I had an extra BRP rotor so I used the best 2 of the 3 OEM’s and there is little if any vibration noticeable. I was very pleased with EBC’s on a previous Spyder. Very disappointing this time around.

Well THAT'S interesting. It is slight - and I don' think these Spyder rotors can be turned. If it gets worse, I think there are several rotor options out there and that requires new pads also, even if they are not worn out. Also, someone mentioned a wheel bearing adjustment. Please correct me if I'm wrong, but most wheel bearings now are sealed, set and non-adjustable. Ahh for the good 'ole 50's-60's days of fix it yourself and "justemups"