# FAQ: How To Measure Bicycle Chain Ring?

## How do you measure BCD chainrings?

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.

## 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 I find BCD?

In many cases the BCD is printed right on the chainring like in the example below. Sometimes it is stamped or engraved on the back side of the chainring. If it is not labeled on your chainring, you will need to measure it. On a chainring with 4 bolts, the BCD is the distance between two bolts across from each other.

## What is the smallest chainring for 110 BCD?

The smallest chainring with a BCD of 110 mm is a 33 from TA Specialite.

## What is the difference between PCD and BCD?

Chainrings are sold by number of bolts and PCD or BCD, which is the same thing and stands for Pitch Circle Diameter or Bolt Circle Diameter. Easier than diameter to measure is the centre-to-centre distance between two adjacent bolts.

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## Does BCD matter?

BCD doesn’t really matter until you get into the taller chainrings. Also you won’t notice any real difference between 165 and 170 unless your on a real level. The power transfer of it is negligible.

## What is BCD number?

In computing and electronic systems, binary-coded decimal (BCD) is a class of binary encodings of decimal numbers where each digit is represented by a fixed number of bits, usually four or eight. Sometimes, special bit patterns are used for a sign or other indications (e.g. error or overflow).

## What is BCD file in Windows?

In the world of the Windows OS, BCD stands for Boot Configuration Data. This critical information in the Windows runtime environment tells the Windows boot loader where to look for boot information. The primary and most frequently used of these partitions is the operating system partition.

## What BCD means?

( Binary Coded Decimal ) The storage of numbers in which each decimal digit is converted into a binary number and stored in a single 8-bit byte. For example, a 12-digit decimal number would be represented as 12 bytes. BCD uses more storage for numbers than binary encoding (see below).

## What is BCD Urban Dictionary?

BCD means ” Behind Closed Doors ” So now you know – BCD means “Behind Closed Doors” – don’t thank us. YW! What does BCD mean? BCD is an acronym, abbreviation or slang word that is explained above where the BCD definition is given.