Readers ask: What Is Bicycle Chain Line?

What is meant by chain line?

Chainline is the angle of a bicycle chain relative to the centerline of the bicycle frame. A bicycle is said to have perfect chainline if the chain is parallel to the centerline of the frame, which means that the rear sprocket is directly behind the front chainring.

Why is chain line 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 50mm 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.

What does 52mm chainline mean?

What is chainline? Chainline is the distance between the centerline of your frame and the average centerline of your chainring(s). Unfortunately, if you were to remove these rings and install a standard narrow-wide ring the resulting 1X chainline would be about 52mm.

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How is Q factor calculated?

Q factor is the overall width of an installed crankset, measured parallel to the bottom bracket shell from the outside of one pedal insertion point to the other. You can think of it like this: the larger the Q factor, the farther apart your feet will be.

What is the difference between boost and non boost crankset?

The NDS cranks are identical… they are labelled M640/M645 its basically only the spindle that changes. You can get away with running a non boost chainset on a boost frame but the chainline will be slightly off. Actually, it’ll be better. The boost chainline shift is about clearance, rather than improving chainline.

What is Q factor bike?

Essentially Q-Factor is the distance between the pedal attachment points on the crank arms, also referred to as Tread. It could also be described as the width of your crankset. This affects your stance, if you’ve ever been snowboarding think of it as the same thing, essentially the distance between your feet.

How do you align a bicycle chain?

Front derailleur limit screws

  1. Change the front and rear shifters into the lowest gear and rotate the cranks until the chain moves onto the inner chainring.
  2. Undo the cable retailing bolt on the derailleur.
  3. Adjust the L screw until the chain sits in the middle between the chain cage side plates.

How do bottom brackets work?

The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely. It contains a spindle to which the crankset attaches, and the bearings that allow the spindle and crankset to rotate. The chainrings and pedals attach to the cranks.

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How much clearance do you need between chainring and chainstay?

We don’t like to go less than 3mm clearance between chainstay and chainring, and you can contact the bike frame manufacture to see what their frames allow for chainring clearance and chainline.

What does chainring offset mean?

Offset moves the chainring further away from the crank and closer to the seat tube. Reducing the offset from 6mm to 3mm on a long-spindle (external bearing BB cup) crankset will result in a 52mm chainline.

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