Shimano recommends a chain line of 50mm for their XTR front derailleur. My current setup runs a SKF BB 118mm spline length that makes 51mm chain line on a 3x9 crank. The rear chainline is 45mm on a 9 speed Shimano cassette w/ 135mm rear spacing.
While the bike shifts fine, its not as crisp or quiet as I like it to be. Would changing the BB to a 113mm thereby moving the front chain line to 48.5 improve things? What would be the effect on the XTR front derailleur?
As an asside, I've been considering going the route of a 2x9 using Middleburn Duo cranks. I've been informed that they keep the chain line the same so their effect should be non-existant. Right??
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