![]() ![]() The distance from the centre of the bottom bracket to the ground. Looking for great deals? Check out Chain Reaction Cycles’ latest clearance offers ![]() Putting your centre of gravity further forward also helps with climbing, making it harder for the front wheel to lift or wander around. Modern bikes favour steeper angles that put the saddle directly over the bottom bracket, making pedalling easier and more efficient. And we measure the effective seat angle using the saddle height of the test rider. We measure all of our test bikes and give you both measurements. Others take an average saddle height depending on the size of the frame. Some use the point at which the seat post intersects a horizontal line drawn from the top of the head tube. The problem is with this measurement is that manufacturers don’t always tell you at which point on the seat post they measure to. It is always steeper than the actual seat angle. Effective, or virtual seat angle tries to take account of this, and uses a line drawn through the centre of the bottom bracket to the centre of the seat post. ![]() As the name suggests, actual seat angle refers to the lay-back of the seat post, but on modern suspension bikes this is complicated by the seat tube starting forward of the bottom bracket, to accomodate shocks and give rear wheel clearance at full travel. This is the angle of the seat tube relative to the ground. Read more: Best deals on mountain bikes and ebikes Mountain bike geometry explained in 9 numbers From top tube length to bottom bracket height, mountain bike geometry can reveal plenty about how a bike will ride and whether or not it will fit you. ![]()
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