Shimano SLX M666 Disc Brake

Overall Review:

These brakes are awesome. You really can't beat them for the price. I haven't had to do any maintenance on these since I got them. Shimano brakes in my opinion are also the easiest to bleed. They have tons of stopping power. I run these on my freeride bike and have used them at multiple bike parks and tons of downhill runs. I've never had to use more than one finger on these brakes. The reach adjustment also works great. My brother has ridden his avid codes the same amount as me or less and they are in need of a bleed and mine are not. The bottom line is if you want dependable, strong brakes and you're on a budget get these brakes!

Overall Review:

Great brake, I've got 596, 666 and 785. If I was going to buy again I'd get 666 for sure. 596 are bit less powerful and I wouldn't want to lose the brake cable adjust feature. The 666 really seem as powerful as the 785. The only difference seems you lose the screw-in pad retention pin and have a split pin instead and a slightly less bling master cylinder cover.

Overall Review:

i was running the previous gen slx's brakes and those were pretty good, then both the calipers cracked at the mounting holes and called up shimano and since i work at a shop, the warranty process was very smooth. i recieved in mail two brand new rear m666 brakes, and since they were free and i only need the one rear, i sold the other one which paid for the front so all in all, i only had to pay for rotors. im running them with the avid g3 rotors, 7 inch front, 6 inch rear and after getting the rotors/pads broken in, these brakes are phenominal. all the braking power i need and smooth modulation. compared to the elixirs ive ran, they are relativily low noise and by no means annoying. im using them for dj/light freeride and i hardly ever need more than 1 finger on the lever. ive had zero issues and when i get money i plan to buy the new xtr trail brakes and give those a try! 5 stars on the slx's for sure

Overall Review: I originally bought them for my XC/AM bike, but moved them to my FR bike when I found out the XC/AM frame was cracked. They were more than enough to stop the big bike (at least 40 lbs) on steeps and only 1 finger braking is needed. They also came on my new 29er and I couldn't be happier with them.  No fuss and they work great.  My FR bike originally had Avid Codes on it, which gave me non-stop problems.  It's nice to finally do lap after lap with no complaints about my brakes.

Overall Review:

best brake i ever bought , like to use them on my DH and my dirt jump bikes.