important: Nuts and bolts on your bike should always be tightened to the manufacturer's specifications.

How to Straighten a Bent Disc Brake Rotor

Learn how to easily straighten a bent disc brake rotor.

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.

Related Links

Recommended Tools

Categories

Discuss this topic in the Bicycle Repairs and Mechanics Forum

Does anyone know if the FSA comet 27/39t crankset with FSA external bearing bottom bracket can be converted to a 1x chain ring? I am unable to find any information anywhere....

Read more

WD40 on chain?

Lastest post 1 day ago

Hi, new here. Do not know much about maintenance, that is why I need an advice on chains. I have KMC chain on my hybrid and someone told me that I can use a bit of WD40 to keep it running, clean it from dust and whatsoever. He also is not very bright in terms of bike knowledge so I am doubting his claim. Probably WD40 is not good for lubing the chain or keeping it clean, right? There is need for s...

Read more

Gears changing by themselves

Lastest post 2 days ago

I have changed the handlebars on my son's bike for him and repositioned the gear change from the post to the bars. Now the gear shift lever, when in the lowest gears is changing all by itself into the higher gears. Whilst this automatic feature could be useful, it is not very practical for him! I have tried tightening the tightener but that didn't work. Any helpful suggestions very welcome, fr...

Read more

So I have a problem adjusting the V brakes on my bike. If I set them up so the pull on the lever feels normal, the wheel is won’t move because the pads are already on contact. If I set them up so the wheel will spin freely, then the they are so mushy that fully pulling the lever barely has any effect. I’ve tried a few things: checked the housing and cable, checked for points of flex / wobble i...

Read more

How often do you wash your bike?

Lastest post 1 week ago

Ciao. I know that some bike riders overexaggerate the 'cleaning part' and wash (or spray) their bikes at least once a week. I know, it's mandatory after a muddy trail ride. But I'm thinkging more about daily commuters. It gets dusty here and there, but how long is too long without a shower for a bike? For a bike that rides almost every day....

Read more

Air still trapped in the brakes

Lastest post 3 weeks ago

So, I bleed my Magura MT7 brakes easily 10 times in the last week but there's some air trapped inside that I just can't get rid off, no matter what I do, already tried everything I saw on the internet and that lever is still spongy and the rear wheel will turn with brakes fully applied if I push it hard enough. Any bike mechanics here with some input for this kind of situations? Thanks in advance...

Read more

Schwinn Boundary bottom bracket bearing let go. I would like to upgrade them to sealed bearings. Threaded frame bottom tube 35 mm nut thread od. x 73 mm wide....

Read more

Please watch the attached video. I gave a ride to person on my luggage carrier and her jeans got stuck in the chain. Ever since then, my back has been making this "ticking" sound or whatever you can call it, and it feels as if there's a bit of resistant to the pedals and a "locking" motion sometimes. Moreover, the wheel seems to be swinging a bit in the video and it's not turning in a straight cir...

Read more

I am upgrading an 8 year old Scott Solace from the Ultegra 6700 series, have acquired almost all the new components but wondering about the shifters. I have the Shimano Ultegra ST-6703 shifters for a triple. They work on my double crankset with a 10 speed drivetrain. What I am trying to find out is will the 10 speed shifters work with an 11 speed setup? Like I said, the shifters, even though they ...

Read more

Fixing up old bike

Lastest post 3 weeks ago

Hello, new here. Recently, I bought an old second hand bike and decided to fix it up. I wanted a cheap frame that I could work on and tweak from the ground up. Have learned a lot about bike repairs (lots of mistakes) and learned that there’s still a long way to go. Including pics and would like some ideas on how to work on fixing this up from here (please go easy on this newbie, haha). That bein...

Read more

Fox DPX2 Damper sound

Lastest post 3 weeks ago

Hello togehter I got my frist piggyback damper, en hear a „nock“ which definitly comes out of my dampet while i‘m squish the damper. Is this a normal noise? Video here: https://www.reddit.com/r/MTB/comments/pvygel/fox_dpx2_2021_is_this_noise_normal_i_hear_a_quiet/?utm_source=share&utm_medium=ios_app&utm_name=iossmf thanks✌🏻...

Read more

FRONT DERALIEUR NOT WORKING

Lastest post 1 month ago

Hi guys, I have restored a 90' Fisher mountain bike. It works perfectly apart from the front derailleur. Gears goes down no problem. They go up from the first to second cog no problem but it is very difficult to make it go to the biggest gear. This is an old SRAM groupset. It is not the cable tension, not the limit screws and not the position of the derailleur on the frame. These are the basic t...

Read more

Help with headset preload

Lastest post 1 month ago

First time adjusting a headset and I'd like to get it right. Brand new giant reign with a carbon frame, that I do not want to damage I finally have the preload set to where there is no play but I'm concerned that it is to tight... Stage 1- obvious play/clunk Stage 2- no clunk, but if I lock up the brake and push and pull hard, I can feel some very slight movement Stage 3 - no play or movemen...

Read more

Rear axle

Lastest post 1 month ago

  20210910_120907(1).jpg (Size: 82.12 KB / Downloads: 31) Hi, i am looking for a rear axle for my Devox felt rear wheel. i cannot find one anywhere, if not is there an alternative...

Read more

Help please! I have tried many things to fix the loud clunking sound in my Meridian trike with no success. We even took the gear hub apart and reassembled it per the suggestion from Schwinn that it probably needed replacing. Many others have suggested something in the rear axle tube is making the noise, but I don't understand the descriptions. Are there videos to watch on this matter? Or is there...

Read more