Blessed with trickledown technology, the Formula RX Disc Brake shares the general design and performance of the top shelf R1 -- but in an extremely affordable package. You can expect to get that same smooth application of stopping power and consistent lever feel that you expect from Formula's high-end products, with only a tiny weight penalty.The Formula RX Brake employs the new radial design master cylinder. The RX master cylinder body works just like its more expensive big brother, but a pressure cast body, as opposed to a forged body, keeps the cost down as does the use of steel hex-bolt hardware instead of the R1's alloy torx bolts. It can be run moto-style with the rear brake on the left as both lever/master cylinder bodies are identical.It features the same 22mm diameter pistons as the R1 and both can use the same brake pads. However, where the R1 has an alloy backed organic pad, the RX comes with a steel backed organic pad as standard equipment. It uses a polyester braided hose that works to prevent hose expansion when the system is under extreme pressure. Formula uses DOT 4 brake fluid, which is less temperature-sensitive than mineral oil.The pistons themselves are made of a heat dissipating composite material and are cupped to provide even more surface area for the fluid to push against and to help shed built-up heat. The one-piece caliper design is stiffer because there are no bolted-together parts to flex along the seam line when you need to stop fast and grab a finger-full of lever. Good ventilation on both the bottom and top of the piston dissipates heat and the top vent also helps make pad changes easy, even with the wheel still in the bike.The Formula RX Disc Brake is available in Black or White. The price reflects all the parts, save for the rotor which is sold separately in three sizes; 160mm, 180mm, and 203mm. Each size comes with the appropriate adapters. The RX brake weighs 341 grams (with 160mm rotor).Please note: almost all hydraulic brake lines need to be cut to size before a bike is properly shod with hydraulic disc brakes. You'll need a quality cable-cutter like the Park CN-10 and a spoke to first cut and then de-crimp the housing.
Weaknesses: Very little modulation, very on/off switch like. Very loud squealing and honking sounds. Came overfilled with fluid from factory. Worst customer service I have ever experienced.
These brakes came on my 2011 Ibis Mojo HD and have been a nightmare ever since. They stopped very abruptly with very little modulation. I spoke to tech support where they said they probably came from factory over filled with brake fluid and they needed to be bled. I paid a local shop to bleed them and I still had the same exact problems. I sent them in to formula service and they once again diagnosed over filling and rebled them and sent them back. I still had same exact problems as before with no improvement. I recently sent them back to Formula and once again they still say they were over filled even though they bled them last and now they also want to charge me $50 to rebleed them. They also wouldn't mount up to my X-fusion Vengeance fork but I had no problem mounting the XTs. I told them to keep them and not bother shipping them back to me. I now run Shimano XTs on my bikes and have had zero issues.
Bike Setup: Stan flow rims, Sram X9 build, shimano XT brakes, KS remote post, spike spank pedals
a All Mountain Rider
Date Reviewed: September 21, 2013
Strengths: Powerful. Light. Easy to set up. Reliable. Well made. Consistent.
Weaknesses: Separate rotors or other parts can be expensive.
Pad to rotor tolerances are close.
Excellent brake, very well made/designed. Power is remarkable and the modulation is very good leading to progressive and positive braking that inspires confidence. This braking system simply out-performs most of the most expensive brakes out there!
Strengths: Modulation, power. Easy to service([pad change) looks, weight
The front brake makes an awesome sound when active. Buzzes like an angry bee. It is not loud and it is a good indicator of brake performance.
Weaknesses: Have not encountered any.
They came stock on my bike
I have been using the Formula RX brakes for about 10 month now. before writing a review I wanted to give them a good work out.
They are good looking and functioning brakes. When I started using them the original organic pads where installed. They worked good at first but after a few long fast downhills they started to become very noisy.
After sanding the pads and cleaning the rotors with isopropyl alcohol they would be quiet for one or two rides(20 milers). Then the sound would come back. I think I was just too heavy 235 lbs and overheated the pads on every ride.
The day I started using sintered pads the became noise free and have been quite ever since.
They have not needed a bleed yet and still feel like they did a year ago.
All of my riding is in dry so cal. Can't say anything about performance when they are wet.
I recommend those and if one were to brake in a crash I would replace it.
Strengths: Strong powerful brake performance with reliability and lightness. Beautifully made. Plenty of options from basic, which is excellent, to highly adjustable. Different colour options.
Weaknesses: Brake pad to rotor tolerances are very close and so occassionally the pads kiss the rotors. This does not effect the performance. I have found that the basic organic pads are very good.
This is a gem of a brake, a really well engineered and manufactured system which showcases the high quality of Italian design & engineering. The power to weight ratio is striking & although this is one of the less expensive of the Formula range of brakes, & therefore slightly heavier, it is still head and shoulders above most braking systems in its class. Reliability is first class, power is forceful, fitment is elementary and the modulation is good. Some have alluded to the modulation as being a little "on and off". I would suggest that this is a braking system for the more advanced rider, someone who has considerable experience of different systems and who will adequately be able to handle a powerful braking system like this one.
Similar Products Used: Shimano Deore, XT, XTR. Hope Mini, Mono Mini, Evo XT & M4, Avid Juicy & Avid Elixir 7, Hayes Prime Comp.
Bike Setup: Commencal Meta 55, Full XT, Hope Pro11 Evo hubs with Stans Arch EX rims Comp spokes, Raceface & Fizik. Maxxis Ardent 2.25's...not tubeless.
a All Mountain Rider
Date Reviewed: August 27, 2012
Strengths: Excellent power, very modest weight, good modulation, sexy and sleek design, great construction.
Weaknesses: Can be somewhat noisy, decent but not great modulation.
These brakes came spec'd on my GT Sanction. They have EXCELLENT power, i am completely confident one finger brakeing in all situations. They can squeel a tad, and the modulation isnt superb, but i completely expect that in a single piston brake with this much power. On a heavier longer travel enduro all mountain bike like a sanction, ill take brakeing power over modulation any day. Perhaps it just takes relearning the pressure to be applie to the lever alittle more.
Similar Products Used: 06' XTR brakes, Hayes hydro's
Bike Setup: 2011 Sanction 1.0 stock
Date Reviewed: July 15, 2012
Strengths: Great brakes, very keen and are great on downhill trails. They look great and even sound great when slamming on when bombing down a hill or even on the flats. Have had these on my cube reaction gtc pro for the past year and have no major complaints. Havent had to swap out the pads yet.
Weaknesses: When riding in the wet they squeal and make a resonating humming sound when the pads are really dirty, recommend a good clean after a heavy muddy trail... Apart from that nothing at all.
Brilliant set of brakes, they look good, sound great, are light and will definitely stop you dead on a steep slope, worth the money.
i ride these on my XC fully - 180fr/160rr. they have tons of power and feel great. i haven't noticed any modulation issues but can see why some describe them as a touch grabby.
so far, these brakes are perfect. only thing left to see is long term reliability and how they deal with really long west coast downhills (20-30mins).
bottom line is these can't be beat for performance and value and i don't give out that rating easily
Strengths: Great stopping power, relatively light, durable, problem free
Weaknesses: A bit of an on/off feel, there isn't tons of modulation
Initially, I was not impressed with the brakes, but I soon found that the extremely lightweight rotors were the culprit in the vibration while stopping. When I changed out the rotors for something that was also lightweight but tried and true performers, the problems went away.
These brakes have always been very grabby, even with the installed organic brakes pads. I have grown used to the little modulation that I have to work with, and favor their consistency on the trail. I get really good braking power all the time and never notice any fade. I have had these brakes for just over a year now and they have not needed a bleed or even felt like the stopping power has deteriorated.
Strengths: Great set of brakes for the price. Stop on a dime, easy to install, and great modulation. I bought a set of these for about 200 bucks. Very good value for the buck. Formula CS has been awesome too.
Weaknesses: Rotors squeal when wet and my front one squeals when applying light brake pressure. Might be user error but nontheless annoying.
Most definitely would buy these again. You wont go wrong with formula brakes. Love the looks and the feel.
a Cross Country Rider
from Hartbeespoort, South Africa
Date Reviewed: March 15, 2012
Strengths: Its light, brakes well whether you're slamming them or just want to slow down - great control. They look awesome!
I have had quite a number of different brake sets and changed radically when I did in an attempt to find the perfect set. And then I found these....Won't be changing soon again.
Similar Products Used: Tried all Avid version and these are far more superior at a great price.
a All Mountain Rider
from Auburn, WA USA
Date Reviewed: March 10, 2012
Strengths: Great power, great lever feel, modulation.
Weaknesses: A little noisy in the break-in period.
Outstanding brakes at a great price. Easily as nice as my Saint brakes, and better than any of the other brakes that I have tried out. Four chilis only because I would like to spend more time on them to see what the longevity is on the pads and the durability of the small parts.
Similar Products Used: Hayes mags, Hayes HFX, Shimano XT, Shimano Saint.
Bike Setup: Ellsworth Epiphany, Loaded custom hand built wheels, e.Thirteen cranks,
a Weekend Warrior
from Beaver Falls, PA
Date Reviewed: January 17, 2012
Strengths: Great feel & modulation. Very powerful
I bought these to replace ORO K24's, which I liked. These are even better. Great feel, very powerful, clean design. They use the same pad as The One brake, which is larger than the Oro pad. Im a 200 lb guy on a 30 lb 29er. Not one issue with these brakes and Im still on the original pads after more than 6 months of 2-3 times a week riding hilly terrain. Haven't tried a bleed yet. Haven't needed to. I wouldn't hesitate to recommend these brakes. Very pleased
Weaknesses: Get noisy riding during cooler temps using sintered pads.
I use these bikes for my trail riding on my bikes here in CO front range for one season. For the price, they are an excellent value. They have worked well from day one out of the box. They seemed to hold up very well for the steep fast descents that are common here in CO. Modulation has been excellent so far. I didn't experience any issues aligning them when installing. I think they are a great break for typical trail moutain biking for those on a budget.
Formula R1 lever with RX caliper.
I'm seeing these online for about $250 with rotors but I don't know much about them? I recently broke a lever on my old juicy ultimates and I need something to replace them on my Yelli screamy. Looks like you can get shimano XT's for about that price but that doesn ... Read More »
I have some rear brake issues with my RXs:
After braking the piston in the master cylinder returns VERY slowly - making the lever jump around for ten secs being clonky and just not feeling right!
Question is, how do I take out the piston to check for faulty spring, muck etc.?
Thanks for any replies ... Read More »
I've got an extra, clean Reverb bleed kit. I think I need to bleed my Forumla RX brakes (they seem to require a more force at the lever than they used to after about 1 1/2 years).
Anyhow, the kit I have looks a lot like the one in the pictures here:
[url=http://www.pinkbike.com/news/Tech-Tuesd ... Read More »
When I remove the brakes pads and take wheel out. How far can I bring out the pistons(aprox)
before air gets introduced into the system.
Has anyone ever tried putting in a bunch of washers and squeeze handle to bring out pistons?Read More »