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Front Derailler Adjustment Problem

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Old 11-08-11 | 03:43 AM
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mde
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Front Derailler Adjustment Problem

I have a problem adjusting the front derailler on a secondhand bike I bought at the weekend. It works OK on low gear and in the middle gear but despite turning the high screw out four times I just can't get it to shift up into the highest gear.

I am wondering if it is possible for the gear to rust in such a way that it will shift into low gear but not high?
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Old 11-08-11 | 05:32 AM
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Hi and welcome to BF

There are a few common problems that can cause what you are describing. An easy way to eliminate some of them is to completely detatch the cable and see what range of motion you are getting from the parallelogram, before altering the limit screws.

It could be that the clamp has slipped, the cable has stretched (and so the lever physically can't pull enough cable to actuate the mech far enough to shift to the big ring) or the mech could be damaged in some way (pretty unlikely, in the scheme of things).

HTH
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Last edited by Matt Gaunt; 11-08-11 at 10:33 AM.
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Old 11-08-11 | 09:04 AM
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Bill
 
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From: HIGHLANDS RANCH, CO

Bikes: Specialized Globe Sport, Specialized Stumpjumper FSR Pro

I'm with Matt. I want to know which of the three likely culprits is causing the mis-shifting before trying to fix it.
Is it the Derailer?
Is it the cable/housing?
Is it the shifter?

Before you can fix it you need to locate the problem unless you just want to replace it all.

P.S. - another fix might be a new bike.
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Old 11-08-11 | 09:48 AM
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Thanks, Matt. I was wondering if there was just something I was missing. It has been a while since I've had to do anything other than just adjust the gears on a bike. I'll take the whole thing off and start from scratch. See how that works.

I guess wmodavis works for a bike maker :-) Not exactly an environmentally friendly suggestion to dump a perfectly good bike because the front derailer is out of adjustment.
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Old 11-08-11 | 10:09 AM
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Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Limit screws are often misunderstood by folks not familiar with derailleurs. They don't actually control the movement of the derailleur, they only establish the inner and outer range of travel possible. It's the cable itself that controls the derailleur movement.

I think some of the confusion occurs because in the slack cable position (usually the inner front & outer rear) the derailleur will be leaning on the limit and so it does control the position. In the opposite positions, (outer front or inner rear) the position is controlled by the cable adjustment, and the limit screw serves only to keep the derailleur from going beyond the desired position.

I always set the tight cable limit independent of the control levers,, activating the derailleur by pulling the cable away from the frame tube like a bow string, and setting the limit for optimum shifting to the largest sprocket. Once the limit is set I then adjust all the shifting and trim by cable tension.

Unfortunately many bikes today have no barrel adjuster to set FD cable tension or trim, which makes what used to be a simple 2 second job into a trial and error nuisance. To overcome this I suggest adding an inline cable adjuster, so simple stays simple.
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Old 11-14-11 | 03:04 AM
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Thanks, FB. I actually went to the fietspunt at my nearest station and the guy twiddled with the cable and it one minute we had fixed gears. Shame the tutorial I read on the web had not mentioned that one!
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Old 11-14-11 | 08:33 AM
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Bill
 
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From: HIGHLANDS RANCH, CO

Bikes: Specialized Globe Sport, Specialized Stumpjumper FSR Pro

I didn't say throw the bike into the dump! If you give it to a needy kid it will get another riding a bike (helps environment). Buying a new one helps the economy, provides jobs etc. makes you work harder to pay for new bike. Hard work is good. New bike makes you smile and the mfg smile and in the process you made a kid smile. Smiling is good for the environment. Simply properly adjusting the FD doesn't make nearly as many smiles.
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Old 07-04-12 | 01:18 PM
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Originally Posted by wmodavis
Buying a new one helps the economy, provides jobs etc. makes you work harder to pay for new bike. Hard work is good.
Actually my taking on more hours of work to pay for a new bike is very bad for other people. If I work more hours it means my employer doesn't take one new people so while I get a new bike someone else is sitting around unemployed. There is a good article on this here:

Why Americans should work less – the way Germans do
There is a solution to unemployment: if we worked the same shorter hours as Germany, we'd eliminate joblessness overnight

Nobel Laureate Paul Krugman and Richard Layard, a distinguished British economist, took the lead last week in drafting a sign-on "Manifesto for Economic Common Sense", condemning the turn toward austerity in many countries. This manifesto seems destined to garner tens or even hundreds of thousands of signatures, including mine.

While the basic logic of the manifesto is solid, there is an important aspect to the argument that is overlooked. We can deal with unemployment every bit as effectively by having people work fewer hours, as we can by increasing demand.

The most important point to realize is that the problem facing wealthy countries at the moment is not that we are poor, as the stern proponents of austerity insist. The problem is that we are wealthy. We have tens of millions of people unemployed precisely because we can meet current demand without needing their labor.

This was the incredible absurdity of the misery that we and other countries endured during the Great Depression, and which Keynes sought to explain in The General Theory. The world did not suddenly turn poor in 1929, following the collapse of the stock market. Our workers had the ability to produce just as many goods and services the day after the collapse as the day before; the problem was that after the crash, there was a lack of demand for these goods and services.

The result of this lack of demand was a decade of double-digit unemployment in the United States. The spending programs of the New Deal helped to alleviate the impact of the downturn, but because of the deficit hawks of that era, Roosevelt never could spend enough to bring the economy back to full employment – at least until the second world war made deficits irrelevant.

This is the same story we face today. The US and European economies were close to full employment in 2007 due to demand created by housing bubbles in the United States and across much of Europe. These bubbles then burst, substantially reducing demand. As Krugman and Layard point out in their statement, one remedy for this loss of demand is for government to fill the gap. If the private sector is not prepared to spend enough to bring the economy to full employment, then the government can engage in deficit spending to make up the shortfall.

But there is another dimension to this issue. It's great for the government to generate demand insofar as it can productively employ people. This means either providing immediate services, like healthcare and education, or in investing in areas that will provide future dividends, such as modernizing the infrastructure or retrofitting buildings to increase their energy efficiency.

However, it can also employ people by encouraging employers to divide work among more workers. There is nothing natural about the length of the average work week or work year and there are, in fact, large variations across countries. The average worker in Germany and the Netherlands puts in 20% fewer hours in a year than the average worker in the United States. This means that if the US adopted Germany's work patterns tomorrow, it would immediately eliminate unemployment.

Of course, it is unrealistic to imagine such large changes occurring overnight, but governments can certainly attempt to encourage employers to shorten workweeks and increase vacation and other paid time-off. In fact, this is the real secret of Germany's post-crisis recovery. Germany's growth has been no better than growth in the United States since the start of the downturn, yet its unemployment rate has fallen by 2.0 percentage points – while unemployment in the United States has risen by almost 4.0 percentage points. The difference is that Germany encourages firms to reduce work hours rather than lay off workers.

Since workers in the United States put in the most hours, the US has the greatest potential gains from shortening work years. But all countries could try to go this path. In the short term, this route keeps people employed and allows them more time to enjoy with their family and friends. Ideally, most of the lost wages will be made up by subsidies from the government. (Remember, the problem is too little demand, not too much. We can afford this.)

In the longer term, workers may find that they prefer more leisure and may be willing to sacrifice some income to have a shorter work week, paid vacation or family leave, or other paid time-off. If that ended up being the case, it would be a lasting benefit from using short-time working as a route for dealing with the downturn.

But even if there are no long-run changes in work patterns, shorter work hours should be on everyone's list as a mechanism to combat unemployment. It is a proven success story with real benefits for workers and the economy.

https://www.guardian.co.uk/commentisf...way-germans-do
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Old 07-04-12 | 09:46 PM
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I came here to learn about adjusting a FD, but instead learned that I should only be working 30 hours a week! (Or I should say, "sitting in the office for 30 hours a week," I rarely put in more than a couple of hours of actual work a week)

I'm talking to HR tomorrow!
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