Often asked: How To Measure Bicycle Chain Line?

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 is the chainline on a bike?

There are two related aspects to the term “chainline.” First, chainline can be defined as the position of the cogs or chainrings relative to the center line of the bike. The bike center line is an imaginary plane running front to rear through the middle of the bike.

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 are chain lines?

Chain-lines, or chain lines, are the prominent, wide-spaced, parallel lines in laid paper, used in both manuscripts and printed books, left by the wire mesh across the bottom of the From: chain-lines in A Dictionary of English Manuscript Terminology 1450–2000 »

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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.

What size is standard bicycle chain?

Chains come in 3⁄32 in (2.4 mm), 1⁄8 in (3.2 mm), 5⁄32 in (4.0 mm), or 3⁄16 in (4.8 mm) roller widths, the internal width between the inner plates. 1⁄8 in (3.2 mm) chains are typically used on bikes with a single rear sprocket: those with coaster brakes, hub gears, fixed gears such as track bicycles, or BMX bikes.

How can I tell if my bike chain is stretched?

Another ballpark method for checking chain wear is by measuring it with a ruler. Pick a rivet and line it up at the zero mark. Count 24 more rivets and your last rivet should be at the 12″ mark of your ruler. If it is off by more than 1/16″ your chain is stretched to the point of replacement.

How do I know what speed my bike is?

Multiply the front gear number by the rear gear number to get the number of speeds. For example, if you have two front gears and five back gears, you have a 10-speed bike. If you have one front gear and three back gears, you have a 3-speed bike.

How do you get a good 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.

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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 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.

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