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Project Sports

Questions and answers about sports

Rear derailleur adjustment

6 min read

Asked by: Claudia Anderson

What position should derailleur be?

Shift it up



It dictates how far towards the wheel the derailleur can move (the lower limit). Push the body of the derailleur until it’s as close to the wheel as it’ll go. The jockey wheel cage shouldn’t be able to move further than a position directly below the largest sprocket.

What does the B limit screw do?


Quote from video: The G is the guide pulley it guides our chain across the cassette B is for the B set screw that's the body angle screw that helps position the guide pulley close to the cogs.

What do the H and L screws do on a derailleur?

The limit screws do not control the derailleur on the sprockets between the two extremes. These are set using the barrel adjuster and tension on the inner wire. The limit screws are usually marked “H” and “L”. The “H” controls the outer most limit of the derailleur, and the “L” controls the inner most limit.

Can you adjust derailleur tension?

Adjust the cable tension



Turning the adjuster anticlockwise increases tension on the cable, bringing the derailleur closer to the wheel. Clockwise decreases the tension, moving it back towards the frame. If the chain seems hesitant to shift up, increase the cable tension by turning the barrel adjuster anticlockwise.

How do you position a rear derailleur?

Quote from video: It's likely being stopped either by the limit screw or the shift position first turn the H limit screw counterclockwise a few turns pedal.

Should you adjust the front or rear derailleur first?

In a nutshell, adjust the front derailleur first, then the rear. Show activity on this post. If the derailers just need minor tweaking (they are basically in adjustment but are “not quite right”) then you adjust the one that is obviously wrong, check the overall adjustment again, then again adjust what needs adjusting.
Jun 9, 2016

What are the 3 screws on the rear derailleur?

On most derailleurs there are three limit screws: the upper limit, Lower limit, and B-limit. The upper limit screw sets the maximum distance the derailleur can shift in high gears. The lower limit screw sets the maximum distance the derailleur can shift in the lower gears.
Aug 18, 2017

How close should jockey wheel be to cassette?

With the bike in the highest gear, the upper jockey wheel should run just clear of the cassette. Turning clockwise will increase the gap, anti-clockwise will close it. Adjust until there is about 2mm of clearance between the cassette and the upper jockey wheel.
Oct 5, 2020

How close should your derailleur be to cassette?

Just get the guide pulley as close to the bottom of the cog as possible without it making noise. But as cassette ratios get wider, the recommended gap has ballooned from 1-2mm to 5, 6, 7, or even 8mm depending on the set up. The larger the tooth count difference between the top two cogs, the more space you’ll need.
Sep 29, 2017

Do limit screws affect shifting?

Cable tension and limit setting



In the simplest of terms, sluggish upshifts can be caused by too little cable tension; while slow downshifts could be too much tension. Limit screws set the extremes for which a derailleur can travel. Too often people wrongly play with these screws when shifting goes bad.
Aug 17, 2016

What is H and L in rear derailleur?

Your derailleur has two limit screws. For the outer limit, you adjust the H-Screw, so your chain does not fall between the cog and the dropout and for the inner limit, you turn the L-Screw, keeping the chain from derailing towards the spokes.

How do you use H and L on a bike?

Viewed from behind the bike, the H screw limits how far the derailleur can move to the right, while the L screw limits how far the derailleur can move to the left. Unscrewing lets the derailleur move further in that direction; screwing in restricts movement in that direction.

How do you align a derailleur?

Quote from video: We then rotate the tool hundred and eighty degrees. If this gap is larger than three millimeters. We know our hanger needs a bit of straightening. So we bend and we measure our distance to the rim.

How much does a derailleur adjustment cost?

Derailleurs – (per derailleur) $25 labor for derailleur adjustment and lubrication. If cable and housing needs to be replaced, labor is $25 plus the cost of the cable and housing. If a bent derailleur needs to be aligned, there is an additional $15-20 labor cost.

Which way do you turn a barrel adjuster?

To do this, turn the barrel adjuster (see below) counter clockwise. If the chain is not shifting well from the largest to the smallest chainring, then the inner wire tension needs to be lowered. To do this, turn the barrel adjuster clockwise.

How do you align a derailleur?

Quote from video: We then rotate the tool hundred and eighty degrees. If this gap is larger than three millimeters. We know our hanger needs a bit of straightening. So we bend and we measure our distance to the rim.

How do I know what gear I’m in on my bike?

Quote from video: If you want to go into your easiest gear on your bike. Little chain ring biggest gear on your cassette.

Which cog is gear 1 on a bike?

Conclusion. So, there you have it. Gear 1 is an incredibly useful gear when you need to climb steep hills with ease. Finding gear 1 is easy too – just use the gear shifters to move the chain so that it is on the front chain ring closest to the bike and the rear cog which is closest to the back wheel.

What gear should a bike be stored in?

The bike should be stored with the gears set to the highest gear (the chain on the smallest cog), so that the spring in the derailleur is under the least pressure, and the cable is also under the last tension. So the cable will stretch less and the gears will stay in adjustment longer.
Jul 3, 2015

What gear is best for going uphill on a bike?

Low Gear = Easy = Good for Climbing: The “low” gear on your bike is the smallest chain ring in the front and the largest cog on your cassette (rear gears). In this position, the pedaling will be the easiest and you’ll be able to pedal uphill with the smallest amount of resistance.

What is the hardest gear on a bike?

Assuming you’re talking about a bicycle with the gear mechanisms out in plain sight, which is the most common way bicycles are geared, the hardest (highest) gear is when the chain is on the biggest toothed ring by the pedals (called the “front” in shifting jargon, even though the pedals are in the middle of the bike)