Back to School '14Back to School '14

Description

Light enough for XC, powerful enough to smash appendages.

Formula has revamped their entire lineup, based in part, on the merits of their incredible R1 brakeset. The good news is that the trickledown effect has resulted in a host of new products that share the same great new design features. The Formula RX Disc Brake is such a recipient. It shares the general design of the top shelf R1, but does so in a value-minded package that weighs in within 10 grams of their legendary Oro Puro brakeset. With the RX brake, you can expect to get that same smooth application of stopping power and consistent lever feel that you'd expect from Formula's top shelf products -- all in an extremely affordable package.

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 instead of a forging keeps the cost down as well as 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 the 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 mated, bolted-together parts to flex along the seam line when you need to stop fast and grab a fistful of lever. The caliper provides good ventilation on both bottom and top of the piston and pads for better heat dissipation. The top vent also helps make pad changes easy, even with the wheel still in the bike.

The Formula RX 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 with the appropriate adapters. The RX brake weighs 351 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.

  • Rotors available separately
  • Front hose length: 47in (120cm)
  • Rear hose length: 64in (164cm)

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Unanswered Question

What size rotor will these brakes work...

Posted on

What size rotor will these brakes work with?

5 5

Solid, Fast-Stopping and Great Feel

Started with a set of Avid Juicy 3's on my Santa Cruz Heckler and then migrated over to these.

Tested quite a few other brakes (Hopes, Avid Elixirs, etc), but these brakes inspired the most confidence and had the best 'feel'.

Lever stroke is short, although adjustable, and if you're looking to stop like you mean it, these things are the way to go without blowing up your wallet on race brakes. Some people appear to have a problem adapting to the 'lack of modulation' of these brakes and to that I say... oooook? I haven't had an issue at all. Rode these on Porcupine Rim two days after they came out of the box and found that I could feather them through hairy technical sections just as easily as any other brake I tried. Brake only when you need to, and when you do, brake like you mean it.

Haven't had to do too much service / bleed these yet. Probably put 40-50 hrs of riding on them thus far. Will update my review once I have to do some maintenance.

One caveat: I have experience a low-pitch squeal since the day I bought these, although it's so faint it's hardly noticeable at this point. Rotors were bedded correctly and all looks good from a mechanical standpoint, just a personality quirk I think. With that said my Avids would scream like a banish under hard braking. And THAT's annoying.

5 5

Solid, Fast-Stopping and Great Feel

Started with a set of Avid Juicy 3's on my Santa Cruz Heckler and then migrated over to these.

Tested quite a few other brakes (Hopes, Avid Elixirs, etc), but these brakes inspired the most confidence and had the best 'feel'.

Lever stroke is short, although adjustable, and if you're looking to stop like you mean it, these things are the way to go without blowing up your wallet on race brakes. Some people appear to have a problem adapting to the 'lack of modulation' of these brakes and to that I say... oooook? I haven't had an issue at all. Rode these on Porcupine Rim two days after they came out of the box and found that I could feather them through hairy technical sections just as easily as any other brake I tried. Brake only when you need to, and when you do, brake like you mean it.

Haven't had to do too much service / bleed these yet. Probably put 40-50 hrs of riding on them thus far. Will update my review once I have to do some maintenance.

One caveat: I have experience a low-pitch squeal since the day I bought these, although it's so faint it's hardly noticeable at this point. Rotors were bedded correctly and all looks good from a mechanical standpoint, just a personality quirk I think. With that said my Avids would scream like a banish under hard braking. And THAT's annoying.

5 5

Formula rx is the rx for brakes

I got this new front brake because the Juicy 3 that came on my fuel 5 was making ungodly noise and then barfed the new pads. Huck and Roll's service was great. I installed the brake in the parking lot of my office and it was perfect literally out of the box. I have to take the front wheel off my bike to get it into my car and the pad separator works well to keep the pads apart. One small thing. Pump the brake a few times when the wheel is reinstalled, the first couple of stokes are long. Rest of the ride, Perfect. So the RX for brake issues is the Formula RX. Trust me, I'm a Doctor. RT Biss, MD.

5 5

Great brakes at a reasonable price

I expected these brakes to be a huge step up from my old Avid mechanical brakes but I honestly don't know how they could be much better.
The braking power is amazing. I am over 200 lbs and I can stop on a dime now.
The touch and feel is good, although it took some getting used to having such a tight lever.
These brakes look good and work better for half of the price of some other hydraulic brakes that honestly can't be better.