![]() ![]() Stack height is the distance between the centre of the bottom bracket and the centre of the top of the head tube. Effective top tube length is the length of a virtual horizontal line drawn between the top of the bike’s head tube and the centre of the seatpost at the same height. The image shows you all the key length measurements you need to know when considering a bike’s size. We’d always recommend looking at manufacturers’ own size charts, which will usually list a suggested height range for each bike frame size they produce, but here are some general guidelines: ![]() So, where do you find out what size frame you need? Like so many other things on a mountain bike, there is no one perfect solution because, within sensible limits, you can adjust your saddle, stem and handlebar to help make a slightly imperfect fit feel fine. The seat tube length will dictate the lowest saddle height that can be set and the top tube length will roughly dictate how stretched out a rider will feel. It’s still important to consider seat tube and top tube length when buying a bike. Smaller seat tube lengths mean shorter people can fit on bikes with a longer reach figure because they can adjust the seat height lower, opening up the potential to ride a larger bike. This means they’ve been able to grow the bike’s reach figure, wheelbase and top tube length while trying to keep seat tube lengths and stack heights shorter and lower. ![]() Getting a bike that’s the perfect fit can seriously improve comfort, control and speed on the trail. ![]()
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