Tech Talks Presented by Park Tool is a monthly video series hosted by Park Tool's own wrench whisperer, Calvin Jones. The new series will cover the A to Zs of some of the most prevalent repair jobs, with the second episode tackling one of the most annoying - and common - mechanical issues that we see: bent disc brake rotors. There's almost nothing worse than pedaling up a hill knowing full well that one of your wheels isn't spinning freely, especially when you can actually hear the rotor scraping against the pads.
A bent rotor doesn't always have to stay bent, however, and you may be able to straighten it rather than replace it. Below, Calvin shows you the tools required and runs you through the process. Watch those fingertips! Tech Talks - How to True a Rotor
Need more Calvin in your life? Episode #1 shows you how to take on tubeless tire installation and conversion
in two easy to follow videos that will have you feeling like a pro.
Stay tuned for more mechanical how-to videos with Calvin returning on the last Thursday of every month to show you the easiest way to get the job done. Want to know more? Park Tool's how-to section
has you and your bike covered. www.parktool.com
I don't get it.
I dunno, if I tossed all the rotor's I smash on rocks I certainty couldn't afford this stash of Shimano brake pads I've been hoarding over the years.
Same with tires.
Might tolerate a torn seat for a while.
You can buy a new rotor for the cost of grips, so why would I want to keep riding with a rotor that won't stay straight?
Sure a minor bend can be fixed but when a rotor is bent bad enough just gun it.
Ok it's 2:30, I gotta go
Mountain bikes are expensive beyond measure, but I find that if you're willing to get creative with how you approach the sport you can get a lot more bang for your buck than you think.
A brake rotor is just a brake rotor, but pretty soon with that attitude, everything on a bike becomes a throw away item.
The problem with PB users is that they are always looking to contradict someone and argue a useless point. My "throw it away" comment was more for the biker who's been there before dicking with a bent rotor and finally saying f*ck it, and tossin it out.
I'm not a dentist, and I don't like wasting money. And I'm also really good at fixing something someone else gave up on. But sadly I can't fix the atmosphere here on PB.
Much like giving up on a useless argument, when a part has seen its better days I get rid of it.
Thanks for confirming my statement.
Gonna go for a ride now so I can argue with my friends in person.
1. If the wobble is because not all rotor bolts are tight (as he points out in the beginning), don't just tighten the rotor bolts. Take the rotor off, clean the mating faces and only then bolt the rotor back on.
2. Use a whiteboard marker instead of permanent marker on the rotor spokes. You don't need much to wipe these clean once you're done.
I've mentioned it before...you miss a great opportunity to learn and bond with your bike when you wrench it. If it turns out the rotor remembers it prefers to be bent then sure, replace it, but you won't have lost anything in trying to make the fix.
As for using "proper" tools on a mountain bike...go ahead. But like anything else in moderation, a tool of necessity can get the job done with patience and thought. A rock might be pushing it in this case, but rock or walk...you choose.
Throw rotor in trash
Install new rotor