Fat Camp Podcast #2 with Ken and Andy – Hub Standards


Show Notes for Podcast #2:

  • Goal of Podcast – Explain why you may want to consider a wider hub than “normal” in the future
  • Introductory info:
    • Q-Factor Diagram
    • Boost Hubs – 148mm spacing rear, 110mm front
    • 150/157mm rear spacing – Long time standard for downhill bikes
  • Chain line basics
  • Wider hubs – wheel stuff
    • Wider hubs = stronger wheels
    • A wider hub increases the “bracing angle” of the spokes giving side forces on the rim less leverage to decrease the spoke tension.
    • The Bicycle Wheel by Jobst Brandt
  • Tire/drivetrain clearance
    • Two primary issues with 3” or bigger tires
      • Chain rub on tire
      • Keeping chainstays thick enough to be strong/stiff without compromising tire or chainring clearance
      • Both of the above are solved by moving the chain line outward (getting chainrings out of way)
    • Wider hubs allow shorter chainstays with fewer drivetrain constrictions.
    • Bottom line:
      • Boost is the bare minimum to allow + sized wheels and 2x drivetrains plus lots of other benefits
      • 150/157 is boost-ier and offers bigger benefits but you start to get some negatives that may or may not affect you specifically
      • Why wouldn’t riders want to have the option to run + tires as well as all the “normal” tire sizes?
      • You don’t need Boost to go + if you are fat – Listen to our last show for more info

One Response to Fat Camp Podcast #2 with Ken and Andy – Hub Standards

  1. Mike June 24, 2015 at 7:08 am #

    Many thanks to Ken and Andy for doing the show…a great resource!

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