Getting the right size bike is essential for both comfort and performance. A bike that is too small will result in a cramped, uncomfortable ride while one that is too large will create problems with handling and stability. The best way to determine the correct frame size is to try one on at a local bike shop, but that’s not always possible when shopping for a bike online or in a store that doesn’t carry your specific brand of bicycle.
In general, a bicycle’s frame size is determined by the height of the rider and their inseam measurement. Some brands will use different measurement systems, but all bicycle sizing systems start with these two numbers. Inseam measurement is a little trickier to gauge than bike height because it requires removing your shoes and measuring from the top of your head tube to the floor. For the most accurate results, have a friend or helper assist you.
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Bikes designed for larger riders will often have a slightly longer Reach and Wheelbase, a higher bottom bracket height and a slacker head tube angle. The slacker head tube angle allows the rider to get more upright and comfortable without having to extend their seat post. A slacker head tube also makes it easier to shift gears without having to bend over as far. In addition, a slacker head tube may also allow the rider to get their weight closer to the pedals for better power transfer and less arm fatigue.