Formula RX hydraulic disc brake review£186.80

Power and control

BikeRadar score3/5

Formula’s RX brake is an increasingly common original equipment fit, but its modulation and control make it well worth upgrading to, particularly if you already have rotors and mounts to offset accessory costs.

Overall design is unsurprisingly similar to the rest of the Formula family, with an organic looking body and deeply crooked lever that bring it in just under 400g. There’s no bite point adjust cylinder and the blade reach uses a recessed Allen key rather than a thumbwheel. This means there’s less to come loose, rattle or otherwise go belly up in long-term use, and all the RXs we’ve run for a while have been rock solid.

Resin pads don’t last as long as the sintered ones on more expensive Formulas in the wet but they’re still okay. Modulation and overall lever feel is excellent too, with a softly progressive stroke building to impressive power even with one finger.

Our only real gripe is the price of the bog standard rotor (£39.95), mount (£17.95) and bolts (£3.95) which make an otherwise reasonably priced (£124.95) brake very expensive – but if you’ve already got those bits, that’s not an issue.

Guy Kesteven

Freelance Writer, UK
Guy started filling his brain with cycle stats and steaming up bike shop windows back in 1980. He worked the other side of those windows from '89 while getting a degree in “describing broken things covered in mud" (archaeology). Dug historical holes in the ground through the early '90s, then became a pro bike tester in '97. Guy has ridden thousands of bikes and even more components the world over since then and can remember them all in vivid, haunting detail. Can't remember where the car keys are, though.
  • Age: 45
  • Height: 180cm / 5' 11"
  • Weight: 68kg / 150lb
  • Waist: 76cm / 30in
  • Chest: 91cm / 36in
  • Discipline: Strict sadomasochist
  • Preferred Terrain: Technical off-piste singletrack and twisted back roads. Up, down, along — so long as it's faster than the last time he did it he's happy.
  • Current Bikes: An ever changing herd of test machines from Tri bikes to fat bikes and everything in between.
  • Dream Bike: His Nicolai Helius AM custom tandem
  • Beer of Choice: Theakston's Old Peculier (not Peculiar)
  • Location: Yorkshire, UK

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