Handlebar turning down .

[cyberknight]

The handlebars on my commuter keep slowly turning down in the stem over a couple of weeks, any idea how to make it stay?
Shim, loctite ?
Luckily i have the bar marked for position.

 

[T.M.H.N.E.T]

Electrical tape?

 

[smokeysmoo]

Carbon paste?

 

[YahudaMoon]

weld?

 

[TheDoctor]

Degreaser, then a shim if that doesn't work.

 

[cyberknight]

Have you got the wrong combination of sizes? If so, can you change one or other?

Its the original stem and bar thats been on years , just started doing it the last few months.

 

[snailracer]

Its the original stem and bar thats been on years , just started doing it the last few months.

Checked them for cracks?

 

[cyberknight]

Odd. I would be concerned that this happening repeatedly could be scoring the bars and creating a potential fracture point.

mmmmm
I think i will be spending any x mas cash on a new bar then.

 

[jazzkat]

Odd. I would be concerned that this happening repeatedly could be scoring the bars and creating a potential fracture point.

I replaced a relatively new set of bars for that very reason. They'd worked loose and got scored. Lightweight aluminium, deep scores and serious pulling up from being on my fixed seemed like a bad combination to me.

mmmmm
I think i will be spending any x mas cash on a new bar then.

Wise.

 

[fossyant]

Tighten stem. Can happen

 

[cyberknight]

Tighten stem. Can happen

Yup as tight as possible already.

 

[sittingbull]

I had this exact problem on my Allez when I replaced the original stem for a shorter one (the length had nothing to do with the rotation).
The stem bolts were as tight as possible. I considered shorter bolts as these were "bottoming out".
In the end I used vulcanising cement (inner tube repair glue) as a "flexible" shim - the bars don't flex. Just a thin layer, waited for it to go "off", then assembled and tightened (same stem and bolts that were previously rotating).
12 months/8000 miles later the bars haven't budged

 

[Adam4868]

Piece of fine grade sandpaper wrapped around .

 

[Gravity Aided]

Thin shim of aluminum from a soda pop can.

 

[Shut Up Legs]

Come on, you know what it is, @cyberknight. It's the sheer powahhh of your leg muscles, and you just need to learn to control it!