Park Tool DT-3 Rotor Truing Gauge

This disk truing device is well built and easy to use. The park tool video has some helpful tips

I used this with my Park Tool truing stand. It fits perfectly and allows you to make those micro adjustments to your rotor. I found that without this tool I could not always get the rotor as straight as I needed it. This addition allows me to get the rotor way straighter!

I was a professional bicycle mechanic for about a decade and used a lot of Park tools over the years. Their truing stands were great for truing wheels and this is a great attachment for truing brake rotors.I considered a tool with a read-out gauge, but the precision of the gauge will likely only frustrate everyone but the most precise mechanic--I wouldn't even recommend a gauge for shop use if you want to be productive. I'd rather spend time riding as opposed to working on my bike so this will keep me from obsessing too much about my rotors.

A good tool to have if you have a bicycle with disk brakes.Don't buy one if you don't have a park tool cycle trying stand to fix it to.Which don't come cheap but the way disks can run out of true from heat will soon pay for itself if you have to keep taking it to the shop for repairs in my opinion it's money well spent.

Here's yet another fine tool from Park Tool. Having recently obtained for my daughter a bicycle that had disc brakes, and noting one of the brakes rubbed in spots - and being told by the bicycle technician that that was a common issue with disc brakes until they "wore down" the high spots, I decided to see how to true the rotor. This tool attached to my wheel truing stand and made short order of ensuring the brake rotor was trued.

Added this to my truing stand. Works perfectly. Also, I don't think the dial indicator is worth it...its really annoying to setup and this does a very good job on its own.

Well built and fits easily onto the truing stand. Easy to set up and calibrate and quickly points out where the rotor needs to be trued. Like all Park tools, it's a bit pricey.

My cheap wheel truing stand (Pyramid Deluxe Wheel Truing Stand) didn't have a mounting point for this rotor truing stand, so I clamped it to my drill press, and drilled a hole in it. Mounted perfectly.The quick-release is nice, because it allows you to quickly swing it out of the way if you're working on a wheel, and not a rotor at the moment.I've already trued several rotors with it - a couple that I didn't even know where out of true. If you have a bike with disc brakes, and you already have a wheel truing stand, this tool is a must-have. You must have a wheel-truing stand in order to use this tool, though - or else you won't have anything to mount it to.