Bad Headshake at 40MPH

[Rebel]

I had to bring "Mr. Thirsty" (my Dodge truck) to work this morning. My bike developed almost a "tank slapper" at about 40MPH this morning. This has been getting worse for a while now, and I attribute this to my fork seals leaking, and an imbalance of fluid. Hopefully the seals I ordered last week should be in the mail today so I can do the job over the weekend.

[bbelk]

The first place I would look is at the front tire. It doesn't take much non-uniformity in the tire to do this. I think forks can do it, but I have gone quite aways on bikes with leaky seals without getting into the problem.

[robert]

Adjust steering head bearings.

[Rebel]

Thanks, but my tires are Pirelli Sport Demons, and are fine. I am more suspect to steering head bearings, which I will check when I am installing my fork seals. I will also check and lubricate my wheel bearings while things are apart.

[SteveD]

Worn tyres, tyre pressure too low, head stem bearings, wheel bearings, loose axle nut, overloaded, right caliper was hanging up ...sometimes it's a process of elimination. Some are easier, quicker and cheaper than others to fix. I hope you get lucky.

[Rebel]

My right caliper was hanging up, so problem solved!!