Bike Forums - View Single Post - 47.5 versus 50mm chainline

10-21-09 | 05:47 AM

#3

Garthr

Senior Member

Joined: Oct 2008

Posts: 1,870

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From: Right where I'm supposed to be

Bikes: Franklin Frames Custom, Rivendell Bombadil

Quote:

Originally Posted by CCrew

Looking to replace a cheapo Shimano M191 crankset that spec's at a 47.5mm chainline with a Shimano LX that spec's at a 50mm chainline. The M191 uses a JIS BB versus the Hollowtech II on the LX, so I really don't have the option of different BB widths. Is that 2.5 mm of chainline going to cause me issues and if so what should I anticipate?

I'm swapping from 8 speed to 9 speed including shifters (LX Dual Control) and Front (XT) and rear (Ultegra) derailers at the same time if that matters.

Thanks..

The only real issue ..... Depending on which rings you ride on most, a 50mm chainline may be better, or worse for drivetrain wear due to the angles of the chain.

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