Technical FAQ: Rear drop out variation.

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.
-Chris

FILED UNDER: Bikes and Tech / Technical FAQ TAGS: cassette / chain / derailleur / dropout / FAQ / hanger / Lennard Zinn / Shimano

Lennard Zinn

Lennard Zinn, our longtime technical writer, joined VeloNews in 1987. He is also a frame builder, former U.S. national team rider, and author of many bicycle books including Zinn and the Art of Mountain Bike Maintenance, Zinn and the Art of Road Bike Maintenance and Zinn’s Cycling Primer: Maintenance Tips and Skill Building for Cyclists. He holds a bachelor’s in physics from Colorado College. Readers can send brief technical questions to Ask LZ.

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