A 250ccm sport bike (e.g. Kawasaki Ninja 250) can't really be considered as a real sports bike. It looks like one, but the performance numbers tell a different story. Riding a 250ccm bike is a good place to start, and if the look and feel of the bike appeal to you, then enjoy!
Modern "sports" bikes are 600ccm or larger, and often have close to 100 horsepower. A 250ccm bike will probably only put out about 35 horsepower - enough to move you quickly (and be a real kick in the pants to ride), but not enough to launch you into orbit like one of the "big boys".
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