# Measure a mountain bike bottom

- How do you measure a piece of equipment?
- Are the bottom brackets the same size?
- What is the diameter of the bottom brackets?
- What size crankset should I buy?
- Is it possible to use a 68mm bottom bracket in a 73mm shell?
- What do you measure your bottom for?
- What do the numbers mean?
- Are the bicycle bottom brackets universal?
- Is the bicycle crank bearings the same size?
- What does the 137 measurement refer to?
- How do you tell if the cranks will fit my bike?
- What size cranks should I use?
- Is it possible to use a 68BB instead of 73?
- I don't know if I need spacers on my bottom brackets
- What is the meaning of bottoms size?
- What is the size of the bottoms?
- What is a bottom bracket?
- What length do I need?
- Is it possible that all of the Shimano cranksets are interchangeable?
- Do the bottom brackets make a difference?

## How do you measure a piece of equipment?

## Are the bottom brackets the same size?

## What is the diameter of the bottom brackets?

The Cannondale BB30a has a standard frame with a common shell width of 42mm.

## What size crankset should I buy?

## Is it possible to use a 68mm bottom bracket in a 73mm shell?

## What do you measure your bottom for?

## What do the numbers mean?

## Are the bicycle bottom brackets universal?

There are many different versions of the same thing, but not all of them are interchangeable.