# How do I measure my bike head tube?

Contents

You will need to measure (in millimetres) the inside diameter (ID) of the top of the head tube (above pic) and the bottom of the head tube (pic below). Measurements are rounded to the nearest millimetre.

## How do you measure a head tube?

The head tube length is measured from the bottom to the top of the head tube. Bikes with a long head tube raises the front end of the bike, putting the rider in a more upright position. Bikes with a short head tube lower the front end of the bike, reducing the frontal profile of the rider, improving aerodynamics.

## How do you measure a bicycle top tube?

What is Top Tube Length?

1. Actual (Center-Center): Measured along the length of the top tube from the center of the seat tube to the center of the head tube. …
2. Effective (HT Top): The length of an “imaginary” level tube extending from the center of the seat tube axis to the top of the head tube.
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## How do you measure a bike head tube angle?

Head tube angle – often shortened to ‘head angle’ – is measured from the horizontal to a line running down the centre of the fork steerer tube. Mountain bikes with front suspension usually have head tube angles in the 62-73° range while road bike head tube angles tend to be above 70°, commonly between 72° and 74°.

## What is the head tube on a bike?

The head tube is the part of a cycle’s tubular frame within which the front fork steerer tube is mounted. On a motorcycle, the “head tube” is normally called the steering head. On bicycles the manufacturer’s brand located on the head tube is known as a head badge.

## What is steerer tube diameter?

Most steerer tubes will be 1 and 1/8th of an inch or 28.6mm some are 1 and 1/4 of an inch or 31.75mm but much rarer. Just measure the inside diameter of your existing stem by taking off the top cap.

## How do I know my bike size?

Method Two: Calculating the bike size:

1. Take off your shoes and stand with your legs about 15-20 cm(6” – 8”) apart. Measure the height from the ground to your crotch.
2. Be sure of the type of bicycle you want: Mountain bike, city bike or road bike. …
3. Now you can take your calculator and calculate the right size:

9 окт. 2020 г.

## What does a 26 inch bike mean?

Usually the size is written on the tire sidewall, for example it might read 26 x 2.2”, a typical mountain bike size. This indicates the wheel is 26” and the tire is 2.2” wide. Wheels are categorized in size by their primary use for road cycling, off road, touring and BMX. … Older road bikes might have 27″ wheels.

## How do I determine bike frame size?

Adult bikes are measured by their frame size. Most manufacturers now measure the frame from the centre of the crank axle, to the top of the seat tube. Most road bikes are measured in centimetres (cm), whereas mountain bikes are generally measured using inches (in).

## What is the top tube on a bike?

The top tube, or cross-bar, connects the top of the head tube to the top of the seat tube. In a traditional-geometry diamond frame, the top tube is horizontal (parallel to the ground). In a compact-geometry frame, the top tube is normally sloped downward toward the seat tube for additional standover clearance.

## What does bike geometry mean?

Understanding the geometry of your steed and the impact it has to your ride doesn’t have to be complicated. Bike geometry is responsible for how a bike looks, rides, and handles, and having a basic grasp of the key figures will go a long to way aiding you in comparing different bikes and what is best for you.

## How does head tube angle affect reach?

Reach. Definition: The horizontal distance from the bottom bracket to the centre of the top of the head tube. … That’s because the head angle is not vertical – so, the longer the head tube, the further back the top of it becomes, and so the shorter the reach measurement.

## Should I cut down my steerer tube?

Before cutting anything, unless you have a special stem that says not to put spacers above it (these are few and far between, the “exceptions to the rule”) you should lower your stem and ride like that for a week or two. See how it feels and only after that should you make a decision about cutting your steer tube.

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## How long should my steerer tube be?

The steerer tube must not be so long as to protrude from the top of the stem, preventing the headset from being tightened, but also must be long enough to allow for enough clamping contact with the stem.