Shimano M770 Hollowtech II bottom bracket review£34.25

Great value BB

BikeRadar score4.5/5

Shimano’s original bottom brackets were legendarily bad, but they’ve cleaned up their act to become one of the best value options around. 

The bearings are a lot more secure, so there’s much less chance of crank wobble. Much better sealing means we’re now seeing units last for months in the worst conditions, making them a decent investment.

The negatives are that the cup threads are a bit short for using with bottom bracket mounted (non-ISCG) chain devices, and they won’t fit Truvativ cranksets.

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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