Thread: Drill Hole In Bottom Bracket Shell
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Old 03-14-18 | 07:28 PM
  #5  
OneIsAllYouNeed
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Joined: Dec 2006
Posts: 757
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From: Seacoast, NH

Bikes: Chinook travel/gravel/family tandem, Chinook all-road, Motobecane fatbike

I use 3/16” or 4.5mm drain holes in B.B. shells. It’s important that they’re not blocked by the cable guide.
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