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Questions and answers about sports

Incompatible front derailleur/crankset?

4 min read

Asked by: Marlin Hogg

Why is my front derailleur bent?

A bent cage can result from a crash or getting the chain jammed at the ring and being forced open by pedaling. Re-bending a cage is difficult. You often end up with multiple bends because it is difficult to isolate the first bend when attempting a fix. Replacement is really the best option.

How do you fix a bent front derailleur cage?

Quote from video: And so basically this just screws right into the derailleur hair like this and then so I'll screw that in it's fine we'll go there and I can use this to go ahead and one bend the thing and.

How much does it cost to fix a bent derailleur?

There can be a range of prices for replacement derailleurs, starting around $20 and going all the way up to $700.

Why do derailleurs Bend?

A common cause of a misaligned hanger is from the bike falling over to the right side. This pushes the derailleur body inward, bending the hanger. It is often possible to repeatedly re-bend many derailleur hangers. This is because there is very little stress from riding the bike or shifting gears.

Can you fix bent derailleur?

How to repair a bent derailleur hanger. You have two options here: try bending the hanger back into alignment, or replace it with a brand new hanger.

How can I tell if my derailleur is bent?

Quote from video: When we're trying to shift. Down becomes quite erratic or vice-versa. The key is to look at the rear derailleur we can see it's bent slightly inward.

How do you straighten a bicycle derailleur?

Quote from video: And we have all the tools you need the correct way to do it is to go ahead and grab your five millimeter allen. Put it in the derailleur hanger bolt here. And go ahead and remove your rear derailleur.

When should I replace my bike derailleur?

Derailleurs will last almost indefinitely. The jockey wheels will wear out in time (tens of thousands of km) but the rest of the mechanism shouldn’t see significant wear. It could be that the spring will break at some point due to material fatigue, but that is also a relatively easy to replace part on most derailleurs.

How do you straighten a bent derailleur hanger?

Quote from video: It's not always so obvious when it's straight but what you can do. If you really had to is pop an adjustable spanner onto. The hanger like that and from the back of the bike.

How do you fix a misaligned derailleur?

Quote from video: So if you have an l-shaped allen key that's great you can insert that into the mounting bolt of your derailleur. And you can use that as a lineman gauge.

How do you fix a bent gear shift on a bike?

Quote from video: So just wiggled on the um the lever. And put the bolt through and found out i had to whack. The kind of c nut back into shape just to be able to for the bolt.

Why do derailleur hangers break?

Front Derailleur – Advanced Troubleshooting

How do you fix a bent derailleur hanger?

Quote from video: It's not always so obvious when it's straight but what you can do. If you really had to is pop an adjustable spanner onto. The hanger like that and from the back of the bike.

How do I know if my rear derailleur cage is bent?

Quote from video: Okay however if you do shift it on the biggest cog or the second biggest and if you notice some some chatter. That is the indication that the uh rear derailleur cage is bent.

Are all derailleurs the same?

No, bike derailleurs are not universal. A derailleur that works with one bike may not work with another bike based on factors such as the cage length. Check the difference between the smallest and largest cogs and also the chainring size to determine the derailleur compatibility.

How do I know if my rear derailleur is worn out?

All derailleurs wear out at some point. Check for wear by pulling laterally on the lower cage. Compare this movement in the linkage of a new derailleur. Sloppy pivot and linkages will produce inconsistent shifting, and the only solution is a new derailleur.

How often should you replace derailleur?

Once the chain wears “or stretches”, it starts wearing the cogs and you pretty much need to replace both to get shifting working again. If it’s been 6 months and you’ve been riding much at all, you should have replaced the chain at least once.

Do front derailleurs wear out?

That said, derailleur springs will lose tension overtime, and pivots will get sloppier. Shifters can wear out too (if you ride enough), and most cannot be serviced back to health.