Jockey too close to spokes

[MintSauce]

 

Bornmam overcomplicating things again. By 'jockeys' he OBVIOUSLY refers to the two jockey wheels.

 

And fiddling with the screws is the first thing I would try since it's not exactly going to break the rear derailleur off and since the screw is there specifically to keep the derailleur away from the spokes. It's the first thing you check....DUH!

 

 

 

 

Back to the problem.

 

If the top limit screw is the problem as you suggest' date=' the symptoms would have been an overshift and chain in the spokes.

[/quote']

 

 

I wasn't suggesting what the problem was at all. Especially since the OP said he'd tried setting the screw already.

 

I was simply disagreeing with your statement about it not being the derailleur settings. That was rubbish for the reasons I stated in my first post.

 

 

 

 

[cyclenut]

johan' date=' if the derailleur was parallel to the spokes, would you reckon it was a bent hanger? [/quote']

 

Wheels with too few spokes and spec'd with Campag may occasionally ping the spokes if you honk hard uphill. This is from wheel flex and the spokes scraping the inside surface of the hanger. It is only a momentary ping on the downstroke from the left leg. It isn't dangerous as no-one I know is strong enough to make the wheel flex that extra 2mm so that the spokes actually jam in the jockey.

 

 

 

It's interesting that this happens when there's power applied to the non-drive side. 

 

JB - I'm being more inquisitive than suggesting this to be incorrect.

Once the original problem is solved perhaps you could revisit this and provide a comment.

[Johan Bornman]

I have a similiar thing with my 9spd Tiagra derailer' date=' if its in the big ring at the back it rubs slightly on the spokes.

[/quote']

 

This "rub" is usually benign. However, if you're curious, you could rub some wax crayon on the area where you think it rubs and decide for yourself whether the spokes will ever be eaten by the jockey or not.

 

You'll find that the jockey hanger plate is countoured (no sharp edges) and of course the spokes are also contoured (round). These two surfaces can touch without much danger of a sharp edge grabbing and destroying bits and pieces.  I just live with my wheel ping. No big deal. It's a by product of too many gears crammed into too limited a space.

 

 

 

 

[scotty]

[quote=Johan Bornman I just live with my wheel ping. No big deal. It's a by product of too many gears crammed into too limited a space.

 

 

Yes it's sounds like a ping and been like that for as long as i can remember and caused no problems thus far.

[Tumbleweed]

I have a similiar thing with my 9spd Tiagra derailer' date=' if its in the big ring at the back it rubs slightly on the spokes.

[/quote']

 

This "rub" is usually benign. However, if you're curious, you could rub some wax crayon on the area where you think it rubs and decide for yourself whether the spokes will ever be eaten by the jockey or not.

 

You'll find that the jockey hanger plate is countoured (no sharp edges) and of course the spokes are also contoured (round). These two surfaces can touch without much danger of a sharp edge grabbing and destroying bits and pieces.  I just live with my wheel ping. No big deal. It's a by product of too many gears crammed into too limited a space.

 

go singlespeed

[Johan Bornman]

[quote=cyclenut

 

It's interesting that this happens when there's power applied to the non-drive side. 

 

JB - I'm being more inquisitive than suggesting this to be incorrect.

Once the original problem is solved perhaps you could revisit this and provide a comment.

 

It is sharp of you to notice this.

 

My mistake. The jockey touches with a stroke of the RIGHT leg. I'm confusing my brake-block-touch with my jockey-touch.

 

A right brake block would touch with the stroke of a LEFT leg.

 

 

 

[Canaris]

Okay so I was wrong.  What about tightening the spokes on the wheel, so that the wheel is stiffer and then does not "bend" into the derailler, or am I committing MAS murder here?

[dirtrider]

NO Kona that is also an option . You could try and bend the rear to run more at a 87degree angle giving you the space you need for your bend jockey !

[Johan Bornman]

Okay so I was wrong.  What about tightening the spokes on the wheel' date=' so that the wheel is stiffer and then does not "bend" into the derailler, or am I committing MAS murder here?[/quote']

 

He he....MASmurder indeed. That's quite funny and I hope becomes a phrase here for those people who don't know, yet answer a question but quickly cautions us that they're guessing by adding "just my 2 cents worth."

 

Nope, I'm afraid you're not a MASmurder. I never shoot down a question.

 

 

Spokes, being made of steel, are a so-called "Hookean" material. In other words, they conform to Hooke's law that basically says that an elastic material (such as steel) will deform linearly with proportional loading. IN plainer English, if you load a given spoke with 1kg, it will stretch by 1mm. If you load it with 10 kgs, it will stretch 10mms. This remains true right up to the point where the stretch becomes permanent. We don't tighten spokes into that range and they thus always comform to Hooke's law.

 

Therefore, if you tighten the spokes a bit more, they will simply stretch a bit and if you then load them (by honking up a hill), they'll stretch some more and exactly as much as before. The preload (extra tightening) doesn't affect it.

 

The only way to make that wheel stiffer is to either increase spoke diameter or to add more spokes.  An indirect way (I say indirect because it is not spoke related) to make it stiffer is to put a big stiff rim on there such as a deep section carbon rim. This will have the effect of loading more spokes at once and mimick an increase in spoke diameter.

 

A stiff rim spreads the load over a longer area than a thin flimsy box-section rim. This is the reason for reduced-spoke wheels having bigger rims than plenty-spoke wheels. They have to.

 

 

 

 

 

Johan Bornman2008-06-09 03:14:27