Chain hitting front derailleur cage with H limit screw fully loosened
6 min read
Asked by: Heck Hardy
Why is my chain rubbing front derailleur?
The reason the chain rubs is because the cable is too loose. And when it’s too loose, shifting onto the large chainring results in only a partial shift. With sufficient tension on the derailleur cable, the derailleur cage will move to its full outside limit and there will be clearance for the chain – and no rubbing.
What does the H limit screw do front derailleur?
Limit screws stop the inward and outward travel of the front derailleur cage. Limit screws are marked “L” and “H.” The L-screw will stop the motion of the derailleur toward the smallest chainring. The H-screw will stop the motion of the derailleur toward the largest chainring.
How do I stop my bike chain from rubbing on the front derailleur?
If the chain is rubbing the outer edge of the derailleur cage, try increasing the cable tension using the barrel adjuster by turning it counterclockwise one quarter to one half turn at a time—increasing the tension will pull the cage out and farther away from the bike.
How do you reset the limit screws on a front derailleur?
Quote from video: If the limit screws are not marked pick one and turn it while watching the cage. The L screw will cause some cage motion shift the rear derailleur to the largest rear sprocket.
What happens if front derailleur is too high?
Most front derailleurs can be adjusted for height and rotation. If the cage is set too high over the largest ring, it may not perform well. Too high a cage can cause a slow shift, and can allow the chain to shift over the largest ring. Too low jams the chain into the ring during the shift.
How tight should a front derailleur cable be?
It is generally a good idea to lubricate the pivot point of the front derailleur with a light lubricant. The cable inner wires should also be lubricated. If you have loosen the inner wire pinch bolt, lubricate those threads as well. When tightening this pinch bolt, secure to approximately 30-40 inch-pounds.
How do you adjust a limit screw?
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. And see if it makes the shift outward.
Why is my bike chain grinding?
The grinding and crunching sound is most likely dirt that the fresh lube moves around until it gets thick again, sticking the dirt away from the metal to metal contact points.
Why does my bike chain keep falling off?
If your chain regularly comes off the inside of your chainset, it could be that the L screw needs adjusting. Put the chain on the small chainring and the largest sprocket at the back. The inner plate of the front derailleur cage should nearly but not quite touch the chain; we’re talking about a gap of 1-2mm.
How do you fix a rubbing front derailleur?
Quote from video: First shift to the small cog. Turn the outer limiting screw counterclockwise. That is outward pull about 1/4 of a turn. And try shifting again that is taking care of the. Problem.
How do you adjust the tension on a front derailleur?
Quote from video: Just how far the derailleur can move either out or in but to actually control the movement of the derailleur. That's all down to cable tension. So limit screws limit the derailleur.
What is cross chaining?
Cross-chaining is when you’re in your big chainring and the biggest cog on your back cassette, or on your small chainring and your smallest cog. The problem is that this stretches your chain diagonally to its limits, and needlessly so, since you could just shift to your other chainring and find a similar gear ratio.
What do the screws on a front derailleur do?
Like a rear derailleur, the front derailleur will have limit screws marked ‘H’ and ‘L’. These screws are used to stop the cage at the extreme ends of travel. The end of the limit screw strikes the linkage, and this stops cage travel. The ‘L’ screws determines the amount of innermost cage travel.
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.
Which way do you turn a barrel adjuster?
Quote from video: Похожие запросы
How do I stop chain rub?
Quote from video: If you have your chain rubbing against your outer or inner plate of your front derailleur. There are two limiting screws that control the movement of the derailleur the outer limiting screw that
Why is my bike chain catching?
One of the most common reasons for a skipping chain is simply a drivetrain that needs a simple indexing adjustment. This is so common that even many brand new bikes can exhibit these symptoms.
What angle should derailleur be?
That means when using a road front derailleur on a bike with a significantly non-standard chainline (e.g. no chainstay angle to measure) then use an angle of about 71 degrees between the post and the chain line. If it’s a mountain front derailleur, something slacker to match a mountain bike’s seat-post angle.
Where should front derailleur sit?
The front derailleur should run parallel to the chainrings. If it doesn’t, slacken the bolt fastening it to the frame and rotate it into the right position. When directly above the largest chainring, the outside edge of the derailleur should sit 2-3mm above the teeth of the chainring.
Why do mountain bikes have no front derailleur?
Mountain bikes no longer have a front derailleur because of the invention of the wide range rear cassette, meaning you can have the same range of gears with fewer parts, which saves weight, and keeps things simpler. Also making the bike build look cleaner.
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.