It is important because it gives the frame back it's intended geometry. You're riding a bike intended to go straight, smooth and fast. The 70 head angle allows the bike to roll over objects, not ricochet. This is much easier on your neck etc. The steering is more than precise, enough to aim from the elbow position.
Lets go one step further.
Products and services available utilizing BTCs. We sell frames and complete bicycles. Fillet brazed Frame materials Steel Purchase from We sell through retailers but will sell direct in areas where we aren't represented.