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Why Do Triathlon Bikes Have Steep Seat Post Angle? (Question)

On a triathlon bike, the seat tube is steeper than a road bike. The angle of the seat tube on a triathlon bike forces the hips to sit forward which gives the rider less tension on their quadriceps and hamstrings.

Why do some bikes have such steep seat tube angles?

  • Time trial and triathlon bikes tend to have very steep seat tube angles for similar reasons. Canyon’s Speedmax, for instance, has a seat tube angle of 80.5° across all sizes, and a seatpost with an adjustable clamp that allows you to push the saddle even further forward.

What does a steeper seat tube angle do?

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.

Why are seat tubes steep?

A steeper seat angle puts you in a more centered position for climbing, and it’s easier to shift your weight forward and backward as needed, compared to feeling like you’re going to loop out any time you start climbing.

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What is a steep seat angle?

Seat tube angle is the angle of the seat tube relative to the horizontal plane, measured from behind the seat tube (e.g. a perfectly-upright seat tube would be 90º and would decrease in angle as the tube tilts backward). A “steep” angle moves the saddle forward while a “slack” angle moves it backward.

Why do triathletes sit so far forward?

So they are more balanced on the bike, where triathletes are kind of front-loaded on the bike—they’re so far forward over the bottom bracket. They’re trying to actually run on the bike rather than pedal like a cyclist does—they get behind the pedal. That creates a different saddle situation too.”

Why are triathlon bikes different from road bikes?

It’s the frame geometry that makes a triathlon bike different to a road bike as the aim is to get your upper body lower and further forwards. Manufacturers give tri bikes a steeper seat angle (angle between seat tube and an imaginary straight line where the top tube meets the seat tube) than a road bike.

Is a slacker head tube angle better?

The head tube angle is the angle of the head tube in relation to the ground. A “slack” angle is anywhere from 63 to 66 degrees. The steeper the head tube angle, the better handling you’ll achieve, but with less stability at speed. Most trail bikes have settled on a minute range of somewhere between 65 and 67 degrees.

What angle should a bike seat be at?

To achieve a neutral weight balance between your saddle and hands, your saddle should be installed anywhere from level to 1-2 degrees nose up. This gets you sitting on the wider rear-part of the saddle and puts your upper body weight on your butt and not on your arms and shoulders.

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What is a slack seat angle?

A slack seat angle places your seat farther back in relation to your bottom bracket. That has these effects: Ripping. – It effectively shortens your top tube when you’re out of the saddle. The entire top tube is shifted back, and that brings the bars closer to you.

Is reach more important than top tube length?

This number is useful for identifying how long a bike will feel while in a seated position. Reach is newer way to measure a bike’s length. So Reach measures your cockpit anytime you’re standing and Effective Top Tube measures your cockpit only while seated with your saddle at a specific height.

What is ETT cycling?

The effective top tube length (ETT) is an important measurement for every serious cyclist when choosing their bikes. The ETT is essentially the length the top tube would be if it ran horizontally from the top of the head tube to the seat post.

Why does head tube angle matter?

Head tube angle also influences trail. This is the distance that the centre of the front tyre’s contact patch trails behind the point where the bike’s steering axis (the fork steerer tube) intersects with the ground. Less trail makes for a bike that steers more sharply, but too little can result in a twitchy feel.

How uncomfortable is a tri bike?

The tri bike, after awhile will give you a bit of a sore neck because it’s in the same position for quite a bit of time and you have to look up a little bit. I personally prefer riding the tri bike because I get to rest my upper body/arms on the tri pad arm rests. My marathon PR is “under three, high twos.

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How uncomfortable is a TT bike?

I would go as far as to say they are extremely comfortable. They have a pair of nice padded elbow rests up front so you can really get into your chill zone, and you can get so low on them it is almost as if you are lying down; the risk is that you may actually fall asleep while riding the bike.

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