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Thread: Gearing

  1. #1
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    12th February 2010 - 10:01
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    Gearing

    This stems from a recent drunken debate between two newbs who don't know much about the technical side of motorbikes. Because KB is full of excellent knowledge here is a quick one for ya.

    My rs250 does 6k rpm at 110 km/h in 6th. If you divide 110 by 6 you get 18.3 km/h per 1k rpm. So if my bike's maximum output is a bit below 12k rpm does that mean maximum speed is close to 12*18.3=220 km/h?? So what I'm actually asking does the speed linearly increase as your rpms increase as well, or, does a decay in speed occur per 1k increase in rpm? If a decay occurs what's it caused by?

  2. #2
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    25th April 2009 - 17:38
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    yip its linear, whats not linear are speedos! though IIRC the RS250 has a digital one so should be accurate.
    "A shark on whiskey is mighty risky, but a shark on beer is a beer engineer" - Tad Ghostal

  3. #3
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    Quote Originally Posted by bogan View Post
    yip its linear, whats not linear are speedos! though IIRC the RS250 has a digital one so should be accurate.
    you the man, thanks!

  4. #4
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    4th April 2008 - 19:22
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    http://en.wikipedia.org/wiki/Drag_%28physics%29

    You might struggle to actually hit that speed too, the power required increases with velocity cubed, so you'll find it harder and harder to accelerate the faster you go.

  5. #5
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    25th April 2009 - 17:38
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    Quote Originally Posted by =cJ= View Post
    http://en.wikipedia.org/wiki/Drag_%28physics%29

    You might struggle to actually hit that speed too, the power required increases with velocity cubed, so you'll find it harder and harder to accelerate the faster you go.
    most bikes are designed so they can hit max revs in top gear though, otherwise there isn't any reason to have such a tall gear. But take care of that RS250 young fulla, it's an awesome piece of machinery
    "A shark on whiskey is mighty risky, but a shark on beer is a beer engineer" - Tad Ghostal

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