When you are sure that your child is keen to continue with BMX racing. It is probably time to start looking for a race bike. This can be a daunting task as there are so many options out there. Freestyle or street style BMX bikes can look similar to a race bike but they are alot heavier than a BMX race bike, so makes it harder to get around the track.
Please make sure you get some advice from someone in the club before you buy.
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To buy the right size BMX bike, it's crucial to consider the rider's height and age. BMX bikes are typically sized based on the rider's height and the corresponding wheel and top tube lengths. Generally, smaller riders under 5 years old (or shorter than 120cm) need a Micro Mini frame with 18-inch wheels. As riders grow, they move up to Mini, Junior, Expert, Pro, and then Pro XL or above. Rider height and frame size are generally correlated, but it's always recommended to try out different bikes to find what feels comfortable and suits your riding style.
The below is a a guide only, as bike brands are all different its best to try before you buy.
Gear Inches are used to give a numerical value to how a particular chainwheel/cog combination will feel. Classic BMX gearing evolved over the years to be 44/16, which has approximately 55 gear inches. The most popular gear ratios are pretty close to a 55 inch, which just seems to feel best for most people. The number is derived from a simple formula: (chainring size / cog size) X wheel size.
Another popular unit for measuring gearing is Roll Out in inches. This is the distance your bike rolls with one rotation of the cranks.The number is derived from a simple formula: (chainring size / cog size) X (wheel size X PI).
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