Overdrive Light - Not Too Bright (not that I should throw stones) - Page 2
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Thread: Overdrive Light - Not Too Bright (not that I should throw stones)

  1. #11
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    Just did an rpm check on mine to be sure, I thought what felt like a lower rpm, but got it substantiated on the highway.

    3150 RPM at 80 MPH (gps) almost identical with speedo in 5th gear, did the "Darkside" 195/55/16 works great.

    3000 RPM at 70 MPH.
    Last edited by maxrider; 07-11-2021 at 10:20 PM. Reason: info

  2. #12
    Senior Member willtill's Avatar
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    Quote Originally Posted by BBB View Post
    Have you heard of HENRY’s Final Drive?
    It’s a remanufactured final assembly with taller gear ratio.
    It actually puts the rpm right where you mentioned.
    I installed it on my 2016 F6B last December and I cannot be happier!
    Mine runs right around 3000rpm @80mph.

    I highly recommend it!
    Don't you lose some low end grunt though, when gearing that low?


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    ...been everywhere, seen everything, done almost everything.

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  3. #13
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    Confused about the RPM I get vs the initial chart listed on page 1 with OEM specs.

    I have lower RPM with the indicated speeds, I initially thought this to be due to the change in tire size(195/55/16) but comparing the tire calculator, there is not sufficient data to support that :
    180/60-16 195/55-16 Difference
    Diameter inches (mm) 24.5 (622.4) 24.44 (620.9) -0.06 (-1.5) -0.2%
    Width inches (mm) 7.09 (180) 7.68 (195) 0.59 (15) 8.3%
    Circum. inches (mm) 76.98 (1955.33) 76.8 (1950.61) -0.19 (-4.71) -0.2%
    Sidewall Height inches (mm) 4.25 (108) 4.22 (107.25) -0.03 (-0.75) -0.7%
    Revolutions per mile (km) 823.06 (511.42) 825.04 (512.66) 1.99 (1.24) 0.2%

    Somebody set me straight .

    Did I already have a lower RPM running engine before?

    Or is the cart off in the numbers:
    OEM Gear Drive
    MPH - RPM's

    70 - 3100 (so here i dropped 100 rpm)
    80 - 3600 (here i dropped 450 rpm) this is a very noticeable drop.
    90 - 4000

    New Gear Drive
    MPH - RPM's

    60 - 2200 (Saw it on a later ride)
    70 - 2600 (500 less RPM)
    80 - 3000 (600 less RPM)
    90 - 3400 (600 less RPM)
    Last edited by maxrider; 07-12-2021 at 08:28 AM. Reason: info

  4. #14
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    Quote Originally Posted by willtill View Post
    Don't you lose some low end grunt though, when gearing that low?
    If anything, the first gear became a lot more useful. Our engine has so much torque to spare off idle, I can still creep out without giving any throttle if I had to.
    But again, my bike is a lighter F6B, not a full dresser. I’ve read people with full riding two up on full dressers also love the newer taller gearing of the Henry’s final drive.

  5. #15
    Moderator BIGLRY's Avatar
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    Quote Originally Posted by BBB View Post
    Have you heard of HENRY’s Final Drive?
    It’s a remanufactured final assembly with taller gear ratio.
    It actually puts the rpm right where you mentioned.
    I installed it on my 2016 F6B last December and I cannot be happier!
    Mine runs right around 3000rpm @80mph.

    I highly recommend it!
    Here it is for the guys who feel they want their engine to run less RPM at 70 mph, Ya just change the rear differential.
    https://henrysfinaldrive.com/

    The guy who invented the first wheel was an idiot -
    the guy who invented the second one... he was the genius!


    http://theringfinders.com/blog/Larry.Royal/

  6. #16
    Senior Member 98valk's Avatar
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    Quote Originally Posted by maxrider View Post
    Confused about the RPM I get vs the initial chart listed on page 1 with OEM specs.

    I have lower RPM with the indicated speeds, I initially thought this to be due to the change in tire size(195/55/16) but comparing the tire calculator, there is not sufficient data to support that :
    180/60-16 195/55-16 Difference
    Diameter inches (mm) 24.5 (622.4) 24.44 (620.9) -0.06 (-1.5) -0.2%
    Width inches (mm) 7.09 (180) 7.68 (195) 0.59 (15) 8.3%
    Circum. inches (mm) 76.98 (1955.33) 76.8 (1950.61) -0.19 (-4.71) -0.2%
    Sidewall Height inches (mm) 4.25 (108) 4.22 (107.25) -0.03 (-0.75) -0.7%
    Revolutions per mile (km) 823.06 (511.42) 825.04 (512.66) 1.99 (1.24) 0.2%

    Somebody set me straight .

    Did I already have a lower RPM running engine before?

    Or is the cart off in the numbers:
    OEM Gear Drive
    MPH - RPM's

    70 - 3100 (so here i dropped 100 rpm)
    80 - 3600 (here i dropped 450 rpm) this is a very noticeable drop.
    90 - 4000

    New Gear Drive
    MPH - RPM's

    60 - 2200 (Saw it on a later ride)
    70 - 2600 (500 less RPM)
    80 - 3000 (600 less RPM)
    90 - 3400 (600 less RPM)
    Your before and after numbers look about right to me.
    Albuquerque, NM

  7. #17
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    Hello 98valk, did you have the same drop in rpm with going with the 195/55 vs the 180/60?

  8. #18
    Senior Member 98valk's Avatar
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    No, I don't actually use a 195/55 tire. I am using a 180/65 tire.

    I wrestled over the math on tire sizes and they never worked out quite right. Someone mentioned measuring rolling circumference. When I did that, the numbers checked out. My rolling circumference was about 1" less than the math. It's going to depend on the actual size of the tire regardless of the numbers, and the air pressure and bikes weight.

    Nonetheless, your numbers look right.
    Albuquerque, NM

  9. #19
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    Okay settled , I rode it side by side with another f6b yesterday, and my numbers are the same, so no change from stock, all good, happy with it.

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