FAQ: How To Measure Bicycle Chain Guard?

Is a chain guard necessary on a bicycle?

It is not necessary to install a chain guard on your bike. The guard will protect your trousers and shoelaces from getting caught in the chain and sprockets.

How do I know my BCD size?

Look at the photos and compare to your crank or chainrings. Find the number of bolts in the circle (Left Column) and the approximate measurement (metric or English) between adjacent holes. Find those numbers in the table, then in the Right Column you’ll see the Bolt Circle Diameter (BCD).

How do you measure chain size?

To measure the chain size, if you have just the sprocket, use calipers to measure between the teeth. Measure from center to center of where the chain roller would set between the teeth that will give you the pitch. Once you know the pitch you can determine what chain size you would need.

What is a chain stay?

What is the chainstay? The chainstay or “stays” = The pair of frame tubes that joins the bottom bracket shell to the rear axle holders (the slots the back wheel goes in). This means that the chain stays connect the bottom bracket (BB) to the center of the back wheel.

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How do you put a chain on a bike chain guard?

Instructions: Installing Chain Guard on Alpha One and Alpha Two

  1. Step 1: Identify the parts.
  2. Step 2: Put the shims inside the brackets.
  3. Step 3: Attach the down tube bracket.
  4. Step 4: Attach Rear Bracket.
  5. Step 5: Attach chain guard to brackets.
  6. Step 6: Position the chain guard and tighten.

What is the purpose of chain guard?

A chain guard, also known as “chain case” or “gear case,” is a protection for your bike’s chain. Generally made of plastic, it encloses it, protecting it around its cycle. Besides protecting your equipment, it also prevents the biker from getting trapped in the chain rings.

What does a chain guard do on a bike?

A gear case, also known as a chain case or chainguard, is an enclosure for the bicycle chain and sprocket assemblages commonly employed by utility bicycles. It serves to protect the cyclist from being soiled or trapped in the chain rings and tends to fully enclose the drive train.

Should I take my chain guard off?

A plastic chain guard is NOT going to stop a broken chain from doing damage. I took my guard off 6 months ago. Keep your chain clean and lubed, and wipe off any excess lube. If you ride in the rain.

What is 110 BCD chainring?

Bolt Circle Diameter (BCD) is the diameter of an imaginary circle running through the center of the chainring mounting holes. It is always defined in millimeters.

How do you calculate BCD?

Luckily, it’s possible to calculate the BCD of a chainring by simply measuring the center-to-center distance of two adjacent bolt holes. Chainrings: Understanding BCD

  1. For 3-bolt chainrings: “A” = “B” x 1.155.
  2. For 4-bolt chainrings: “A” = “B” x 1.414.
  3. For 5-bolt chainrings: “A” = “B” x 1.701.
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What does 130mm BCD mean?

BCD stands for Bolt Circle Diameter. It is the distance from side to side of a circle that goes directly through each bolt hole in a crankset. When you see a measurement like 110 or 130 BCD, that means that diameter is 110 or 130 millimeters, respectively.

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 do I know my roller chain size?

Roller Chain Identification Most roller chain has the size stamped right into the side plates. You may see something like “40”, “C2080H” or “10B” stamped in, which the industry number that represents the chain size. Old chains will most likely need to be cleaned in order to see the size.

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