Set A Limit Screw On A Bike’s Rear Derailleur

The rear derailleur moves the chain left and right so it engages different cogs on the back wheel. A spring pushes it in one direction - usually towards the high gears, the small cogs. A cable pulls it in the other direction.
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00:06 Step 1 - Limit Screw
The limit screws restrict the movement of the derailleur so it can’t move the chain into a position where there is no cog. They are usually labelled with a tiny letter ‘H’ and a tiny letter ‘L’ for HIGH and LOW.
00:20 Step 2 - Demount Or Release The Cable
Some people prefer to set a limit screw before the cable is connected, or with the cable demounted so it can’t pull. That means even if the cable breaks in use there is no risk of the chain shifting off the cogs, although this is an optional step.
00:39 Step 3 - High Limit
With the back wheel off the ground stand behind the bike with your head on the centre line. Turn the ‘H’ limit screw until the top jockey wheel sits directly under the smallest cog. Clockwise pushes the derailleur left, anti-clockwise allows the spring to push the derailleur right.
01:13 Step 4 - Check
Pedal the bike gently, push against the rear derailleur to shift into a lower gear. When you release the derailleur the chain should drop back promptly on to the highest gear. Turn the pedals faster and let the chain drop suddenly to be certain it won’t move too far right and jump over the smallest cog and fall off. Turn the pedals backwards and the chain should run smoothly through the derailleur when the derailleur is in it’s default - highest gear - position.
01:44 Step 5 - Small Adjustments
If you need to make further adjustments move the limit screw a quarter turn at a time and check again after each adjustment. That way if you go too far you know how much to go back.
02:33 Step 6 - Low Limit - Diagnose
Pedal the bike gently and push the derailleur towards the lowest gear position.
02:59 Step 7 - Adjust
If the chain won’t go into first gear - the biggest cog - you need to turn the ‘L’ limit screw anti-clockwise to allow it to move further. If the arm of the derailleur starts to rattle on the spokes or the chain goes over the biggest cog and falls off you need to turn the ‘L’ limit screw clockwise to limit the derailleur's range of movement. As you get closer to the target make small defined adjustments so if you go too far you know how much to go back.
03:41 Step 8 - Check
Once you have the right position for the ‘L’ limit screw double check by pushing the derailleur hard as you pedal to try and get the chain to fall off behind the first gear cog or the derailleur arm to hit the spokes.
03:56 Step 9 - Dustbin Lid
Some bikes are equipped with a plastic disc between the first gear cog and the spokes, this is a ‘spoke protector’ sometimes called a ‘dustbin lid’ or a ‘pie plate’. If the ‘L’ limit screw is kept in the right place you don’t need it. It can be removed by taking off the cassette or freewheel and unclipping it from the spokes.
04:09 Step 10 - Low Normal
Some derailleur work in the opposite direction. The spring pushes towards the low gears and the cable pulls toward the high gears. If you have one of these the process is roughly the same. Start by positioning the ‘L’ limit screw then connect the cabl(link) to pull the rear derailleur right to check - and if necessary adjust - the ‘H’ limit screw.
#BikeRepair #HowTo #BicycleMaintenance

[@irfanahmed7847]

You made my day really clear explanation I was so confused watching other videos

[@josephharview2438]

Thanks, my bike would only go into 3,4,5,6 and it kind of had me a little pissed when it came to uphill climbs, now I can use all of my gears again, thanks mate.

[@atticusalexander2101]

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[@adriendraven6409]

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[@londonnoel7336]

@Atticus Alexander Yea, I have been using instaflixxer for months myself :)

[@gangdoggviper]

I ride bikes for 20 yeara now, never knew how to properly setup rear deraulier untill now !

[@murdockreach5524]

Thanks for your videos
Simple, easy to follow, instructions
Bless your heart

[@tacstokes]

brilliant explanation thank you

[@keegancan]

What exactly do the screws do. One day I might have to see if I can open up the deraileurs housing to to take a look.

[@MadeGoodFilms]

You don't have to take it apart to see. They act as stops at the high and low limits of the derailleur's movement. So screwing in our out either limits or extends the range of motion. If you look carefully you can see the derailleur butting up to the screw at the extreme positions.

[@nickfere8274]

Thanks this helped me so much. I couldn't work out what was wrong. Turns out I had to adjust the skrew

[@Belindaxtz660]

Easy to understand Thanks!..😉👍

[@tpickering99]

That rear wheel is horribly out of true!

[@Combat556]

No mention of B screw adjustment?

[@sbbeowulf8296]

My Limit screw does not do anything on the lowest gear Any Help?

[@dr.awkward9075]

I've got to go see my aunt...Aunty Clockwise. 🤣

[@doxielain2231]

Well, this finally makes sense. Thank you.

[@mikieson]

nice