![]() If you were to draw a line from the centre of the bottom bracket straight up through the frame and one from the centre of the head tube back 'reach' is the horizontal distance between the head tube and the vertical line. Reach is a slightly more difficult measurement to get your head around and refers to the horizontal distance from your bottom bracket to the top of the head tube. Realistically there is about 20mm of leeway shorter or longer than a stock road bike stem, any longer or shorter, and you will drastically change the handling characteristics of your bike. ![]() If you have a bike with a top tube that is too short or too long, small deficits can be remedied with a new stem of different length. The top tube relates directly to your arm and torso length, and it is a figure that doesn’t leave a ton of leeway to be fixed. This can increase the length of the physical section of tubing but does not increase the actual distance between the head- and seat tubes. Old school road bikes see a completely horizontal top tube, while the top tube on most modern bikes slopes downward. The top tube and effective top tube length can differ because of the modern compact or semi-compact geometry bikes. While we can’t offer a specific chart that will tell you exactly what size frame will be perfect for the dimensions of your body, what we can do is help to demystify the numbers on the geometry chart and show you how to use them to figure out the right size for you.Įffective top tube and top tube length can differ slightly. This means two people who are the same height might not fit on the same bike. ![]() What makes things even more complicated is that people are built differently some people have short torsos and long legs, while others have a long torso and short legs. This is especially true when riding one of the best road bikes because you will essentially maintain that same position for the duration of the ride, and if it’s wrong, you’re in for many hours of pain - the bad kind, that is. While minor adjustments can be made with stem length and saddle setback, ultimately if a bike frame is too big or small, the amount of available adjustment won't be great enough, and it will influence the bike's handling characteristics as well as cause issues when it comes to comfort. ![]()
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