Rebel, These bikes are small bikes that when going uphill or against the wind can top out around 55. If your looking for a little more power or top end you can search for threads on here relating to "power improvement" and "jetting". There is a ton a great information here and many of these kind of questions have been discussed in great detail. You might also look up "16T gear", I know that's another hotly debated modification discussed on the forum. If you have any questions that you don't see feel free to start a thread and we will all work to answer any questions you may have.
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