# What does seat tube CT mean?

## What does seat tube CT mean?

Seat Tube Length is a measurement from the center of the bottom bracket up to one of several possible points along the seat tube axis: Seat Tube Top (C-T): The “actual” length of the seat tube up to its very top. This is the most common seat tube measurement on modern bikes.

What is the seat tube measurement?

Seat tube length is the straight line distance between the centre of the bottom bracket and the top of the seat tube.

How do you measure the seat tube center to the top?

Seat tube length is measured from either the centre of the bottom bracket to where the top tube and seat tube meet (Centre-Centre or C-C) or to the top of the seat tube (Centre-Top or C-T).

### What is effective seat tube length?

The effective seat tube length is the distance between the bottom bracket and the point at which a virtual horizontal top tube would intersect the seat tube. For a related dimension, see Effective top tube length.

Does seat tube height matter?

Seat tube angle So if you’re a tall rider, it’s worth bearing this in mind. “Seat tube angle will affect where you’re going to position the saddle. It’s one of those standards that’s never really changed, if you look at a small bike it will have quite a steep seat tube angle, 74-74.5º degrees.

How do you measure the angle of a seat tube?

Effective seat tube angle is what you’ll typically see in a bike’s geometry chart, and it’s calculated by figuring out the angle of a line running from the center of the bottom bracket to a certain saddle position, typically one that’s parallel with a line drawn horizontally from the head tube.

#### What is head tube length?

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.

What is effective seat tube angle?

The effective seat tube angle is the angle between a line drawn from the center of the bottom bracket to the center of the seat post and a line drawn parallel to the ground. The actual seat post angle is the angle between the seat post and the ground and is largely determined by the layout and design of the frame.

What is the best seat tube angle?

Seat tube angles range from about 70-75 degrees. A steeper angle moves the saddle forward while a shallower angle moves it back. Steep is fine for racers. It allows them to ride hard in an aero crouch, as the more open hip angle doesn’t constrain breathing or power transfer.

## What is the best seat tube angle for climbing?

Modern bikes favour steeper angles that put the saddle directly over the bottom bracket, making pedalling easier and more efficient. Putting your centre of gravity further forward also helps with climbing, making it harder for the front wheel to lift or wander around. An angle in the low 70s is good. Mid-70s is better.

Does seat tube angle affect reach?

Rule of thumb: a degree change in seat tube angle changes the reach by approximately 1cm. So the difference between the frames will be about 1cm.

Head Tube. The head tube has two key measurements that will influence a bikes handling; the angle and the length. Bikes with a long head tube raises the front end of the bike, putting the rider in a more upright position.

### Where do I find the seat tube length?

In BikeCAD, seat tube length can be input and displayed in two ways. The first measurement is from the center of the bottom bracket to the center of where the seat tube and top tube connect.

Where does the seat tube connect on a bicycle?

The seat stays connect the top of the seat tube (often at or near the same point as the top tube) to the rear fork ends. Historically, women’s bicycle frames had a top tube that connected in the middle of the seat tube instead of the top, resulting in a lower standover height. This was to allow the rider to dismount while wearing a skirt or dress.

How is seat tube length measured in bikecad?

Seat Tube Length. In BikeCAD, seat tube length can be input and displayed in two ways. The first measurement is from the center of the bottom bracket to the center of where the seat tube and top tube connect. This measurement is called Seat tube length (c-c).

#### Where does the chain stay connect to the seat tube?

It consists of the seat tube and paired chain stays and seat stays. The chain stays run connecting the bottom bracket to the rear fork ends. The seat stays connect the top of the seat tube (often at or near the same point as the top tube) to the rear fork ends.