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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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When it comes to dirt jump bikes, sizes can vary depending on the specific model and brand. However, in general, most dirt jump bikes have smaller frames and wheels than traditional mountain or road bikes.
For a 9 year old who is already comfortable on a 24″ bike, you might want to consider a 24″ dirt jump bike as it should be the right size. However, it is important to note that dirt jump bikes usually have more aggressive geometry and a shorter top tube, so the front end may appear taller than other bikes your child has ridden. This is specifically designed to provide a more stable and balanced ride while jumping and doing tricks.