There’s no right or wrong here, but greater length can help a bike to feel more stable descending, and also help keep the front end down when climbing. It’s a complicated issue, but together with the front centre, the chainstay length determines where you are on the bike (central, further back, further forward). Short chainstays can make a bike easier to get the front end up, which is both a good and bad thing depending on what you want to do. Short back ends aren’t necessarily a good thing because they make a bike loop out more easily on climbs and, contrary to popular belief, don’t really help it to corner. This is the horizontal measurement between the centre of the rear wheel and the centre of the BB.
MTB GEOMETRY CALCULATOR FULL
So how low is low? Long-travel full-sussers have higher static (unsagged) BBs to accommodate all that potential movement so it’s hard to pin an ideal consistent number with full sussers, but hardtails can go as low as 300mm. Too low though and you might start clipping your pedals on things.
MTB GEOMETRY CALCULATOR PATCH
A low BB makes a bike more stable by lowering your centre of gravity and bringing it closer to the contact patch of the tyre. 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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