Shimano SLX BR-M666 Disc Brake System

SLX BR-M666

The new SLX disc brake borrows heavily fromThe XTR line such asThe IceTechnology which reduces heat buildup.Other features: Oversized full ceramic piston for optimized light weight, rigidity, and insulation One-way bleeding--easy and clean bleeding system Heat resistant F03C metal pad included (IceTechnology) Short stroke Servo Wave mechanism for quicker engagement and higher level input 2-finger brake lever with ergo pivot Dial adjust lever reach Ispec compatible Includes pr

User Reviews (13)

Showing 1-10 of 13  
Tim Esposito   All Mountain Rider [Apr 17, 2014]
Strength:

Based on 2 years of riding thus far, I don't think you can go wrong with these grabbers....They hold up, they are easy to maintain, they don't cost that much, they flat out work. No fade,

Weakness:

They don't look good. Need a black finish.

I tip the toledo's at 240... they stop the bike (185's front and rear). No maintenance thus far. No fade at all for me. The cost is very good. If your looking for an upgrade, these are the ones to look at. I had Avids, they worked well but needed adjustment from time to time...no bad but the SLX....perfect. I have a fleet of niners...2 with SLX and one with Xt's... not a real big difference to me there either. I put my money into the XO 1x11 (I also have the XX1 1x11) not a big difference there either. SLX's are the best bang for the money and they last. You can spend big $$ for brakes but you can save a butt load (there's 10 butt loads in a Sh#t Load)...One finger stopping, light weight vs. all.

Similar Products Used: Avid's, Xt's, CR's
OVERALL
RATING
5
VALUE
RATING
5
Lance Armstrong   Racer [Nov 16, 2012]
Strength:

Everything!

Weakness:

I guess they could have given it a nicer finish like xt or xtr

Same power as XTR. 1/3 the cost! These brakes in my mind are the best brake in the world vs. cost! Great one finger levers, easy adjustment, awesome!

Similar Products Used: Shimano M505
OVERALL
RATING
5
VALUE
RATING
5
daniel harvey   [Oct 18, 2012]
Strength:

efficient, affordable, light touch

Weakness:

none so far

Been a BB7 guy for years. Will have trouble using anything but Shimanos now on a bike that finds itself pointed downhill much of the time. These brakes are powerful and only require a light touch. I guess I'm stating the obvious regarding hydraulics. I think the BB7s are still great for my SS and more XC bike, but my Yelli Screamy would not be the same without the Shimanos.

OVERALL
RATING
5
VALUE
RATING
5
666Shifty   Downhiller [Aug 28, 2012]
Strength:

-Great stoping power
-excelent modulation when you get used to them (they are so strong compared to the Avid Elixir that you need some time to get used to them),
-cheep brake pads (even the ones with cooling ribs),

Weakness:

-no free stroke adjustment, you have to buy XT for that (I think you dont need that)
-not so strong with avid G3 rotors, It is big difference when you try shimano rotors (normal ones, not ice-tech)

I think Shimano SLX M666 are the best mid-range all mountain/enduro brakes. They are stronger than Avid Elixir, cheeper, you have fewer problems (or in my case none). Brake pads are cheeper, they last longer.... The only weeknes is that you need Shimano rotors (works better than with other rotors)

Similar Products Used: Elixir CR, Formula The one, Avid code (old), Avid juicy...
OVERALL
RATING
5
VALUE
RATING
5
Front Range Rider   [Aug 21, 2012]
Strength:

Incredible stopping power, quiet, modulation, run very cool (no fade), price, simple reach point adjustment, easy setup (alignment/ no rubbing)

Weakness:

cotter pin to hold the pads in? just seems so cheap. The hole is threaded so there must be a bolt for it somewhere out there.

Picked these up from Blue Sky for $89 a piece. Ice Tech XT Front 180/ rear 160 for $45 and $40. As others have stated these brakes inspire confidence. I had a set of avid Elixer R's (185mm fr and rear) that worked well enough when they were working...only they were never working. Squealed and needed bleeding too much to tolerate. The SLX setup was simple, I didnt have to resize the cable or bleed the cable. Having a proper in/lbs torque wrench would be a good idea, though not at all necessary. Break in of the pads seemed very quick and power increased quickly. These are true one fingers brakes. I dont even think about them except that I noticed how much quicker and smoother I stop now. Locking up the rear wheel requires no effort but still requires intention. The modulation is excellent. One thing I did notice is that these brakes will illuminate flaws in your wheels. I have heard spokes make noise on the drive side under heavy cranking but never from brakes. These do! Another user said his levers would extend down on downhills due to the spring not being strong enough. I can see how that could happen as just tapping the lever in the opposite direction will move it forward, however, it has never happened to me. The 'ice tech' rotors and cooling fins really do the trick. I have yet to experience any brake fade on any of my rides. Im 220 and have ridden the falcon trail and monarch crest so far on these brakes. Very impressed with these brakes as they take my mind off of brake issues and back onto the trail. trek remedy 9.8 for reference. Only gave 4 chilis overall due to the cheeseball cotter pin instead of a real bolt.

OVERALL
RATING
4
VALUE
RATING
5
artypuma   [Aug 08, 2012]
Strength:

great power, quiet

Weakness:

none so far

6'-4" at 296 lbs, I have so much more confidence in my stopping ability over V-brake technology.

OVERALL
RATING
5
VALUE
RATING
5
Tit   Downhiller [Jul 30, 2012]
Strength:

Great power, great modulation (compared to m810 saints), superb heat dissipation, nice feel of the quite short levers.

Weakness:

Haven't found one yet. Maybe the split pin that holds the pads in looks kind of cheap but works. Some might say that there is no pad clearance adjustment, but you have XT's for that.

The Sram 9.0's I had on the bike before just were not cutting it for downhill. I was always dragging my brake (and by doing that overheated them), Formulas were a bit better but pad's and adapters were hard to find (I had to make my own adapters for the most part). When I tried my friend's saints for a few runs I decided I needed new brakes. Second hand saint's were running a just bit more expensive than new 666's and I was sceptic if brakes as cheep as this will work on a heavy downhill bike. But then the shop where I got them had a sale on them and after talking with the owner who also uses them on his own bike I jumped on the opportunity.
Since I'm on a budget I got Hayes V8 rotors to go with them (had good luck with them before) which wore more than half as expensive as even the old XT rotors, let alone new Ice Tech rotors.

Installation was a snap (the clamp lever mounting is a great thing). Initial brake in period was quite short.
First few runs were on a short local DH track where I immediately felt more comfortable on the bike.
The real test was this weekend at Bike park Javornik which is known to be quite hard on brakes. They worked flawlessly, didn't overheat once, had terrific one fingered stopping power, no change in feel the whole day and pad life seems quite good to (using stock finned metallic pads I can't see any usage at all for now). For me personally they have a bit more modulation than 810 saints and just as much stopping power. Even my friend with the saints said that the lever feel is maybe a bit better.

So in short: SLX BR-M666 (and the new 675 which have just a few cosmetic changes and are 10g lighter) are a superb brake, for a great price (paid 74.90€ for each, under 200€ for both with rotors and adapters). They can stop a heavy guy on a downhill course with 203mm rotors without a problem, I'm sure they would be superb on AM bikes even with 180/160 rotors.

Similar Products Used: On mine bikes: Sram system 9.0 (Gremeca System 8), XT M755, Formula Extreme DH (4racing DH), Hayes HFX 9 HD, Giant MPH 1 and 3, Pro Stop

Just riden on friend's bikes: Shimano Saint BR-M810, Magura julie hp
OVERALL
RATING
5
VALUE
RATING
5
SMP1971   [Jun 06, 2012]
Strength:

Build your confidence.

Weakness:

My front started squeling and lost power after the first 5 rides. I have not switched the pads yet and i'm hopeing this will do the trick.

Like every one has said thes brakes are a very good product. They cam stock on my EX 8 and if new pads fix my problem i will be happy again.

OVERALL
RATING
4
VALUE
RATING
4
casrec   [May 28, 2012]
Strength:

Great Power, Good modulation, one finger braking, very little if any fade!!!

Weakness:

Looks, feels like lever could brake easily(but i am sure it can't)

Replaced my stock Hayes Ryde with these guys. They are leaps a bounds beyond the Hayes. Great Power and modulation. Lever feel and feedback is good as well. I gave them a four on value as I felt they should have come with rotors and not that it really matters, but a little more effort in aesthetic would have been nice. All in all though these are some of the best brakes for the money, well worth it and I would recommend to anyone.

OVERALL
RATING
5
VALUE
RATING
4
Timmyt   All Mountain Rider [May 23, 2012]
Strength:

Everything. I can't rate these brakes high enough.I've just built a new hard tail with a generous budget, and these are the most impressive thing on the bike.The stopping power is stunning, coming from some single pot deore stoppers even with one finger i have to be gentle.I did consider the xt model, reading around the reviews where so positive and also these are the same calliper.

Weakness:

None, did have to bleed the front but it was really easy using the screw in tank

Stunning

Similar Products Used: Avid, Deore
OVERALL
RATING
5
VALUE
RATING
5
Showing 1-10 of 13  

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