Bike design is an ever-changing art. As a new category of bike is released, with it comes a suite of new angles and measurements that leaves most scratching their heads. When trying to decide what kind of bike you want, sifting through bike geometry jargon can be overwhelming. Below we’ve put together a handy guide on what all those numbers and angles mean, and most importantly, what they do for you as a rider.
Head Tube Length & Angle
When judging a new bike design, many riders first look for the head tube angle. They want to know how “slack” this angle is because that plays a part in determining what style of riding the bike is designed for.
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. This means the fork of the bike is going to stick out farther, creating a more stable ride at high speeds, but also be slower handling. This angle is also determined by wheel size since a 29 inch wheel requires more leverage to steer, so designers make the head tube angle steeper to compensate. The steeper (more vertical) the head tube angle, the better handling you’ll achieve, but with less stability at speed.
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