Technical FAQ: Rear drop out variation.

  • By Lennard Zinn
  • Published May. 22, 2002
  • Updated Sep. 19, 2010 at 2:33 PM EDT

Follow up regarding Jim’s jockey wheel pinching the chain to the cassette in the large gears:

I built a new Mongoose Ti frame up with all XTR components and had the same problem. No amount of B-screw adjustment would fix it .I measured the distance from center of axle to center of derailleur mounting bolt on my bike and on others. There was a surprising amount of variation. I spoke to Shimano and they said that in spite of published build specs, many manufacturers did not comply.

FILED UNDER: Bikes and Tech / Technical FAQ TAGS: / / / / / / /

Lennard Zinn

Lennard Zinn

Our longtime technical writer joined VeloNews in 1987. He is also a framebuilder, a former U.S. National Team rider, and author of many bicycle books, including Zinn and the Art of Mountain Bike Maintenance and Zinn and the Art of Road Bike Maintenance, as well as Zinn and the Art of Triathlon Bikes and Zinn's Cycling Primer: Maintenance Tips and Skill Building for Cyclists. He holds a Bachelor’s degree in physics from Colorado College. Readers can send brief technical questions to Ask LZ.

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