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So i have this bike: MENS PRO MOTIVE DS400 DUAL SUSPENSION MOUNTAIN BIKE

Bought it 2nd hand quite recently and had this thing that after reaching a certain speed no matter how hard i pedal speed doesnt increase. The pedals feel as if nothing is attached to them at that point. any help?

BTW am completely new to bikes :)

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  • Are you changing gear? Sounds as though you're in too low a gear. So make sure you've tried all the positions of both shifters, you may well find that one of them fixes this problem.
    – Móż
    Sep 13, 2016 at 1:08
  • So at a certain fairly-low speed, the pedals go all floppy and you can't go at all using the pedals? Or there's a point where pressing more-hard on the pedals does nothing to increase your speed?
    – Criggie
    Sep 13, 2016 at 3:24

1 Answer 1

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The gear ratio you're using is determined by the ratio of the number of teeth of the chainring (gear in the front) and cog on the cassette (gear in the back). For a fixed cadence (number of times you turn the pedals per minute), the higher the gear ratio, the faster you go.

So, you need to either shift into a higher gear (move to a bigger chainring and/or a smaller cog on the cassette), or pedal faster.

Note that most bicycles have the ability to freewheel, which means that if you're not turning the pedals fast enough, the bicycle basically coasts. Contrast this with a fixed gear bicycle, which so long as the rear wheel is turning, the pedals will be turning. If you're not pedaling fast enough with a bicycle that can freewheel (like yours), you're basically coasting. So, if you want to use that gear, you need to pedal faster in order to get power through. And if you're maxing out the highest gear, you may want to change the cassette/freewheel to get a smaller smallest cog in the back.

If your cadence is below 60 rpm, chances are it's too slow -- you should probably aim for around 80 rpm.

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