What is the chain line on a bike?

Chainline is the distance between the centerline of your frame and the average centerline of your chainring(s). For 1X this is easy – If the center of your chainring teeth is 49mm from the centerline of your frame then your chainline is 49mm. It gets slightly more difficult if you have multiple front chainrings.

What is a 50 mm chain line?

as you can see, the front ring is 50mm from the middle of the bike (aka, a 50mm chainline). a standard rear end is 135mm between the droputs, meaning that each drop out is 135/2 = 67.5mm from the center of the bicycle.

How do you fix a chain line?

Chainline is measured from the centerline of the frame to the center of the chain. You can measure the front chainline directly with a simple ruler. Simply hold the ruler against the seat tube or down tube and measure the distance from the middle of the seat tube to the middle of the chainring teeth.

Is 52mm chainline boost?

Shimano states 52mm to be boost and 142 dedicated, 55mm apparently boost dedicated giving better chain line. Looks like there isn’t a 55mm “better” boost for XTR. I found 55mm to be much better for boost with a 5010 frame.

Why is chainline important?

The chainline is very important for several reasons: more efficient transmission; the less you bend the chain, the smaller the power loss; better function and less chance of the chain falling off the rings; less wear due to less friction; better function of the front derailleur; and quieter operation.

What is a 49mm chainline?

What is chainline? Chainline is the distance between the centerline of your frame and the average centerline of your chainring(s). For 1X this is easy – If the center of your chainring teeth is 49mm from the centerline of your frame then your chainline is 49mm.

Can I use a non boost crankset on a boost frame?

Yes! The boost spacing is more to do with adequate chainring clearance than chainline. Depending on individual setup chainline may actually be improved for the lower gears by using non boost cranks. I run a non boost crank on a boost frame.

Can you put a 12 speed cassette on a 11-speed hub?

The 12-speed cassette is designed to be backwards compatible with the existing 11-speed road freehub, while the 12 speed-specific freehub (available on Dura Ace hubs currently) can’t be used with the 11-speed parts. Sram HG-style cassettes are largely the same spacing as Shimano, with the 10 speed exception.