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Questions and answers about sports

Chain rubbing on new derailleur and crankset

5 min read

Asked by: Kia Kallaguntla

Why is my chain rubbing on my 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.

Is it normal for chain to rub on front derailleur?

It is possible that the front derailleur will rub the chain slightly even on properly adjusted bikes. This is likely on some bikes when riding in the largest sprocket in front and the smallest cog in back.

How do I stop my bike chain from hitting the frame?

Quote from video: So once you have your piece of tape off the backing you can apply it to the chainstay. Make sure you stretch and kind of conform. And apply this tape around the chain say that way it bonds better.

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.

How do I stop my derailleur from rubbing?

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 tight should a derailleur cable be?

Make sure the derailleur mounting bolt is tight, or shifting will be sloppy no matter how well adjusted the cable is. This usually takes a 5-millimeter hex wrench. If you can’t find the exact specification, 5 to 8Nm is the typical range for this bolt.

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.

What happens if front derailleur is too high?

Derailleur Alignment & Positioning

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.

How do you adjust the tension on a front derailleur?

Quote from video: The limit screws. 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.

How do you fix a slap on a chain?

Quote from video: Now once the pins that hold the plates of our chain together starts to wear. Then the whole chain comes a little bit looser and starts to develop a little bit of a rattle.

What is chain slap?

Chain slap has a few cheap and easy solutions. When it comes to noise, one you cannot miss is chain slap, down every rough downhill section or off every drop your chain makes a right racket slapping up and down against your swingarm.

What is a chain protector?

A gear case, also known as a chain case or chainguard, is an enclosure for the bicycle chain and sprocket assemblages commonly employed by utility bicycles. It serves to protect the cyclist from being soiled or trapped in the chain rings and tends to fully enclose the drive train.

How do you reset a barrel adjuster?

Quote from video: And these have little clicks some of them you can feel you can go click click maybe one or two clicks at a time or just give it a turn maybe do a quarter turn or half turn at a time and then test.

How do you adjust a chain guide?

Quote from video: You want to adjust both bolts evenly so that way the rear wheel stays aligned. Here thread your adjuster bolts in or out until you have about three fingers worth the tension here at the chain slider.

What is a chain stay?

Quote from video: Похожие запросы

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.

How do you adjust a chain guide?

Quote from video: You want to adjust both bolts evenly so that way the rear wheel stays aligned. Here thread your adjuster bolts in or out until you have about three fingers worth the tension here at the chain slider.

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 is a chain catcher?

If you’re not familiar with the concept, a chain catcher is a length of aluminium that attaches to your front mech bolt, extending downwards to stop your chain from overshifting inwards. Its job is to get in the way. That’s all.

Do you really need a chain catcher?

Dropping a chain can be startling and even quite dangerous if you’re in an unstable position, but it doesn’t have to happen. Chain catchers are an inexpensive, yet hardly discussed, solution that will pretty reliably stop your chain from dropping off your small chainring and onto the frame.

Where do you put chain catcher?

Quote from video: Over the years I've seen plenty of bikes bearing the scars of a drop chain which can actually damage the integrity of carbon frames around the bottom bracket area never a good thing the consequences.