Dura Ace 7700 rear derailleur will not fit into hanger

Asked by: Birhanie Pineda

What is a replaceable derailleur hanger?

Derailleur hanger is a replaceable bike part that connects the rear derailleur to the bike frame. Rear mech hanger is attached to your bike using bolts, screws or sometimes lock nuts/rings and then bike rear derailleur itself bolts on to the mech hanger. Almost all modern bikes with gears have it.

Do you need a spare derailleur hanger?

Carrying a spare derailleur hanger will help you when you’re at a loose end. You wouldn’t think a derailleur hanger would be such a crucial and essential part on a bike. Not many people know how important they actually are, but they help protect your bike frame from being damaged by snapping.

How do you Rethread a derailleur hanger?

Quote from video: Start by taking the rear wheel off your bike. Loosen and remove the bolt that connects the derailleur to the hanger.

What size is a derailleur hanger bolt?

Registered. Actually, the thread is 10mm x 1mm pitch as a pretty much universal size. If you wanted to find a bolt or a tap to fit the thread, you would ask for a M10x1.

Are rear derailleur hangers universal?

SRAM has introduced a Universal Derailleur Hanger concept, and word is Trek and other major brands are on board. The idea is simple: Create a single hanger design that works on any bike for any derailleur. In reality, the mounting point and shape for the derailleur interface has been standard forever.

Do all rear derailleurs fit all bikes?

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 important is a derailleur hanger?

Derailleur hangers (also known as hanger dropouts) are bike components that are screwed on the frame’s rear ends, in order to be joined to the derailleur itself. They have a very basic, and important, function – keeping the derailleur in place and preventing it from breaking in the event of an impact.

What is a dropout hanger?

Dropout and Derailleur Hanger 101. For those not up-to-speed on their bicycle glossary of terms, dropouts are the two small notches in the rear of your bike in which the rear hub rests. Put even more simply – it’s where your rear wheel goes.

What causes a rear derailleur hanger to break?

Some common reasons for it breaking are: Hitting an obstacle (e.g. tree branch) Going into the spokes (badly set low limit screw or the derailleur was wobbling enough for some reason to get caught in the spokes) Chain too short.

How do you fix a stripped derailleur hanger?

Quote from video: Now the other idea is you take it to a welder have them weld a little bit of additional metal. Inside the hole there drill. It out and then tap it with a m10 by one millimeter thread tap.

Can you fix a derailleur hanger?

Quote from video: And what can you do without the tools well there are a couple of things you can do actually one is it's very basic which is to actually grab the derailleur with both hands try and cut the whole mech.

How do you reattach a rear derailleur?

Quote from video: To attach the rear mech back to the frame place the main bolt against the rear mech hanger. And use your five millimeter allen key to turn it clockwise until it bites.

How do I know what derailleur I need?

If you are replacing an existing derailleur on a bike, simply count the number of cogs on your cassette and you’re good to go. If your drivetrain’s speed is an unknown quantity, you can count the number of steps that your shifter runs through and add ‘one’ to determine the number of gears your drivetrain has.

How do you know if your rear derailleur hanger is bent?

Rotate the arm of the alignment tool to the 12 o’clock position (pointing straight up). If your hanger is straight, the gauge arm should sit in the same position relative to the rim. If it’s not straight, this will indicate the direction in which the hanger is bent.

How long does a rear derailleur last?

Good quality rear derailleur can last between 3 to 5 years, when unbranded or low-quality ones can last for 2 years, no matter what the durability of the rear derailleur the jockey wheel will wear after time and it can be replaced very cheaply with new ones, on the other hand, front derailleur can last almost

What are derailleur hangers made of?

Derailleur hangers are usually made from inexpensive cast or machined alloy, and is affixed to the frame using bolts and forms part of the frame dropouts (where the wheel axles slot).

What is a bike mech hanger?

A rear mech hanger is a sacrificial component part of a bicycle, designed to deliberately bend or break in order to limit or prevent damage to the bike frame and the other component parts of its drivetrain, when under duress.

Can I use a different derailleur hanger?

If you have a standard mount rear derailleur, you can only use it with a standard mount hanger. If you have a direct mount hanger on the frame, you can only use with a direct mount derailleur with the b-link removed.

How do you reattach a rear derailleur?

Quote from video: To attach the rear mech back to the frame place the main bolt against the rear mech hanger. And use your five millimeter allen key to turn it clockwise until it bites.