Race Face Signature XS ISIS bottom bracket£80.00

Best ISIS choice

BikeRadar score4/5

The splined ISIS standard for cranks and bottom brackets (BBs) didn’t last long before external bearing cranks appeared. The BBs themselves generally didn’t last long either.

One of the few with a decent reputation for longevity (alongside the discontinued SKF) was this top-line unit from Race Face.

The drilled, machined and heat-treated chromoly axle is a tight squeeze to fit but super-secure once set up. Eight independent seals keep the crap out and the same unit will fit either 68mm or 73mm shells.

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: 44
  • 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 tfhan 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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