56. How to Straighten a Bent Disc Brake Rotor

Learn how to easily straighten a bent disc brake rotor.

IMPORTANT: Nuts and bolts on your bike should always be tightened to the manufacturer's specifications.
How to Straighten a Bent Disc Brake Rotor

50% of the cost of the bicycle featured in this video was donated by JensonUSA.

In this tutorial we will learn how to straighten a bent disc brake rotor.

What You'll Need

For this job you will need a zip tie and wire cutters, and a disc truing tool or an adjustable wrench for straightening the disc.

Makeshift Gauge

The first step is to fasten a zip tie around the frame or fork, and cut the end about 1 cm away so that it lines up close to the disc. Position the cut end of the zip tie close to the disc so you can use it as a makeshift gauge and easily tell where and by how much the disc is bent.

Straightening

Using your truing tool or adjustable wrench carefully bend the disc a little bit at a time. Be careful not to bend it too much either way. Rotate the disc to check for true and then repeat as needed until the disc is as straight as possible. You likely won't be able to get the disc perfectly straight, but using this method it should still be ridable. If the disc is too bent it'll need replacing.

Tags

Discuss this topic in the Brake Forums

08/03 Shimano Disc Brakes Inefective

For a while my rear brake has been ineffective. I originally thought it was contaminated either the pads or the discs.

Basically the lever has the be pulled all the way back to the bars to make anything work. But at the start of a ride they squeal a lot. Usually by the end of a long downhill if I have had the brake on all the way down it will start working effectively but then when I start my next ride its back to being ineffective and squeals.

I have replaced pads, rotors and bled the system twice. I have even cleaned both the pads and discs with brake cleaner and sa... Read more >>

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[Image: couKXsP.jpg]... Read more >>

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The bike is essentially new.  Due to military obligations it was ridden a couple of times after purchase and then packed, stored, shipped, stored again and then packed and shipped again (purchased in '11).  I am now in Saudi Arabia and want to ride it around the compound to and from work/store.  

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[Image: 1435565775747_223489554.jpg]


[Image: 1435565916576867229932.jpg]... Read more >>

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[Image: 20150426_194818.jpg]... Read more >>

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Hello gurus,

My daughter has trouble activating hand brakes on her bike. She has small hands and she can hardly reach the handles, and the handles are too hard to pull. I saw the post on the adjustment but I was wondering if instead it would be possible to replace these terrible brakes with something better? I went to a store today and they told me that nothing better would fit the bike because it is a "price point bike". Well, I know it is a cheap bike but I have hard time believing that nothing can be done.

Th... Read more >>

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Hi Guys,

I am having trouble adjusting some cross top / interrupter brakes on my cross bike. The brakes are Avid BB 7's. The trouble I am having is when the cross top lever is tensioned how I like it the main lever is soft. When I tighten the main lever to how I like it the cross top is way to tight. Is this due to different pull ratios of the lever styles or am I missing something? Ideally I would have both levers at even tension. Any suggestions appreciated!

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H i wonder if someone could help me find out what this noise from my back brake is
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here is the same sound on youtube  from someone else  but no answer to the  problem my brakes are
Tektro Gemi i no they are  entry level  should not make this sound   any help thanks
 
youtube brake noise  clip  link

https://www.youtube.com/watch?v=4F8Ugg-i4-s... Read more >>

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Hi,

I am converting a MTB with 26" wheels to 700c. I live in the UK and do not go off road, but would like a bike to ride on canal tow paths (some of which can be a "little rough". All is OK, have swooped out the front forks to a rigid type (with the correct bosses for mounting a V brake onto a 700c wheel) - but....i would prefer too fit V brakes on the rear, and the bosses are in the wrong place. I know that Mavic used to do a converter, but cannot find one anywhere. Has anyone else done this? and what did you do?

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Kevan... Read more >>

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See pics...
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How to Straighten a Bent Disc Brake Rotor
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