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  1. #1
    Senior Member CafeRacer's Avatar
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    Gear Inch Calculator

    I need a gear inch calculater that also tells me speed for a specific RPM. The one on fixedgearfever.com works awesome but doesnt go high enough. There used to be a really good one online but I cant find it.

    Cheers.

  2. #2
    Senior Member jmio's Avatar
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    look at the barenuckle applet on the fixed gear forum. It's on one of the stickies I believe

  3. #3
    Senior Member canflyboy's Avatar
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    1970 Raleigh Sprite, 1970 Raleigh Sports, 1984 Miele Road Bike SS, 2008Cannondale F400, 2009 Opus Avro 29er, 2010 Jamis Sonik, 2009 Blue CXC, 2009 Bianchi San Jose, Cervelo SL-SLC and a wife that loves me!

  4. #4
    Senior Member CafeRacer's Avatar
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    Thats a pretty cool program but it doesnt go high enough. I need somthing that goes up past 200 RPM

  5. #5
    aka mattio queerpunk's Avatar
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    Quote Originally Posted by CafeRacer View Post
    Thats a pretty cool program but it doesnt go high enough. I need somthing that goes up past 200 RPM
    Since the RPM:speed ratio is constant you can just figure out the speed change that 10rpm creates, and then do the addition.

    For example, I plugged in 50x15, 167.5 cranks, and 700cx23. I observe that for every 10rpm the speed increases 2.6 mph. Though 160 rpm is the max (and gives me 41.7 mph), I can calculate that at 210 rpm, my speed will be 41.7 + (5 X 2.6) = 54.7.

    Inconvenient if you want to look at several different gear combinations or whatever, but all the data is there.
    the hipster myth.

    i practice vagabondery.

  6. #6
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    Quote Originally Posted by CafeRacer View Post
    Thats a pretty cool program but it doesnt go high enough. I need somthing that goes up past 200 RPM
    How high should it go? Let me know and I'll adjust it for you... You must have hamster legs!

  7. #7
    Senior Member
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  8. #8
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    Quote Originally Posted by testtube View Post
    How high should it go? Let me know and I'll adjust it for you... You must have hamster legs!
    Ok, I bumped up the top rpm in Rabbit to 240. I figure that's more than adequate... If any one has requests for Rabbit PM me.

  9. #9
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    Is it really possible to hit 240 or even 210 rpm?

  10. #10
    Senior Member CafeRacer's Avatar
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    If your a sprinter 210 is fairly attainable on rollers or on the track behind a motor. Coming off a big hill you can train the legs to go even faster.

    The upgrades to the Rabbit work perfectly, Thanks a bunch for making my post training session math work easier!

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