Thread: Should crank be centered?
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Old 07-31-16 | 01:34 PM
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Bill Kapaun
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From: Mid Willamette Valley, Orygun

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. 2019 Giant Explore E+3

Originally Posted by Seizedpost
Well, I measured the 3s bottom bracket spindle. It's 124.5mm, not 121.5 like Sheldon Brown's database says it should be. What's up with that?

My UN55 BB has a lip on the NDS cup, preventing it from threading in far enough. I got one without a lip. After taking some measurements of chainline, I found that the crank will be centered and the chainline correct with 3mm of spacers.
The 3mm is probably on the NDS, so it wouldn't matter to the chain line.
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