Stumped, wobble at medium-ish speed

Started by stickbow, July 05, 2013, 07:46:52 AM

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Howie

Can't see how, but...  Anyway, do the axle thing, free, can't hurt.

stopintime

Quote from: stickbow on July 06, 2013, 09:15:15 AM
........

Is it possible to have the front wheel off center if I never disassembled the axle? Should I try that bounce technique with the front and retorque the axle nut?


I don't know how likely it is, but can't hurt... (that's the ~quality of my advice)
The axle/fork bottoms pinch bolts are part of this.
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stickbow

#17
Ok well to preface this, I'm an idiot. Yesterday I removed the top triple and lowered the bottom and greased the bearings heartily... I didnt grease them orginially for who knows what reason. So with liberal grease and good stem tightness the issue has left.

HOWEVER, after riding to work this morning I have noticed that it returned slightly, though not nearly as bad. Should I regrease and hope it works more into the system or just let it be and put a hurry up on the steering stabilizer bracket.

OR maybe suspend the front and just work the bearings back and forth a 100 times to spread the grease.

Also I wanted to put out a big thank you for everyones ideas, it helped me work through this process and not get too overly frustrated/pissed.

ducpainter

If you put a steering damper on before you actually fix the issue it's just a bandaid hiding the problem.

I'd inspect the bearings and races closely for wear/brinnelling. That's when the bearings wear little divots in the races. It causes the bearings to want to fall back to the same spot. As a rider you make minor steering inputs constantly and the bearing is fighting you causing the wobble.

I'd wager you need new bearings
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stickbow

Yeah I know about the steering dampner logic, Im just wondering if Im paranoid now or if its just rider input from said paranoia.

The races are new, maybe a hundred miles on them and didnt have any obvious flats or hangups when I looked at them yesterday. Im pretty confident I never hammered them or overtightened enought to flat spot them. They are roller bearings by the way. Is there a specific way to get the grease on the back side of the bearings? As in between the tapered inside part that presses onto the stem, and the bearings themselves? Its easy enough to get it on the outside of the bearings and race that goes into the frame head.

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Johnny5

Well, I'm a mechanical idiot but personally I'd replace the tire and then go from there.   Worn tires will do some weird chit... and I've seen a few buddies wobbles (at specific speeds) cured with a new tire.
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ducpainter

"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."



ducpainter

Quote from: stickbow on July 09, 2013, 08:00:51 AM
Yeah I know about the steering dampner logic, Im just wondering if Im paranoid now or if its just rider input from said paranoia.

The races are new, maybe a hundred miles on them and didnt have any obvious flats or hangups when I looked at them yesterday. Im pretty confident I never hammered them or overtightened enought to flat spot them. They are roller bearings by the way. Is there a specific way to get the grease on the back side of the bearings? As in between the tapered inside part that presses onto the stem, and the bearings themselves? Its easy enough to get it on the outside of the bearings and race that goes into the frame head.
Races only, or bearings and races?
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."



Speeddog

Perhaps bearings/races not seated completely in the frame and/or lower triple.
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stickbow

I inspected the bearings, but not the races, as they are installed in the head.

I think my issue was not packing the races like that, so Im going to use a syringe to pump some grease in there. Almost positive this will get rid of the last little bit of weaving.

Learn something new everyday, thanks for the video, and other feedback