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Speedo

Discussion in 'Norton Motorcycles (Modern)' started by Kid Thunder, Oct 19, 2018.

  1. Kid Thunder

    Kid Thunder

    Joined:
    Sep 30, 2018
    I have a feeling that my speedo is off. Seems faster than what I'm going. Does anybody have any rpm match to the speed? Like 4000rpm equals ?mph?
     
  2. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    Yes Lots of Data on that. 60 indicated = 57 mph , 70 indicated = 67 mph , 80 indicated = 75/76 mph. On my bike with STOCK 18/50 gearing.
     
  3. Kid Thunder

    Kid Thunder

    Joined:
    Sep 30, 2018
  4. Britfan60

    Britfan60 VIP MEMBER

    Joined:
    Jan 5, 2014
    Most report being off 5mph. Mine is much more at higher speeds. More like 10%. When I'm doing 80, I'm really only doing about 72 or so.
     
  5. TonyA

    TonyA VIP MEMBER

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    Jan 16, 2015
    Easy to verify no need to guess . When I was running the 17/47 gearing I was spot on 50 to 85 .
     
  6. Kid Thunder

    Kid Thunder

    Joined:
    Sep 30, 2018
    Yeah. That's the way mine feels. People are passing me when I'm doing 80!
     
  7. Clive

    Clive VIP MEMBER

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    Jun 9, 2017
    Maybe stating the obvious but can you borrow a satnav/ gps bike computer to confirm?
     
  8. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    Frankly , Are you going to care if you are really going 75 when your speedo reads 80 and they are still passing you ? you need to go 85 then !
     
  9. BritTwit

    BritTwit

    Joined:
    Aug 25, 2009
    Agreed!
    But, Tony you know my 961 becomes much smoother around 5200RPM or an indicated 90mph.
    I would rather be there than 85mph.
     
  10. Britfan60

    Britfan60 VIP MEMBER

    Joined:
    Jan 5, 2014
    I'm not guessing. We have radar displays all over Long Island. That, and I'm basically keeping up with traffic. Folks don't average 75 to 80 mph with State Troopers all over the place. Speed limit is 55 and the average car is doing about 62.
     
  11. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    8 mph off at 80 is quite a lot.
     
  12. Kid Thunder

    Kid Thunder

    Joined:
    Sep 30, 2018
    Yeah I guess what you mean. But sometimes I ride alone with no traffic & am a little worried about cop radar.
     
  13. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    Ok Kid , This is what I do : Use your smart phone and put on a tank bag that has a clear map window. Download a free speedo app to your smart phone. Put the phone in the map pocket while you start your app. Read off the speed when you are on the highway driving. Most speedometers read a bit high. Meaning you're going a little slower than the speedo reads.
     
  14. Clive

    Clive VIP MEMBER

    Joined:
    Jun 9, 2017
    In the UK we have products like the RoadAngel which has a GPS based speed readout and road speed limit indicator plus a database of static speed cameras and laser radar detector. Maybe you could get something similar.

    If you get clocked for speeding is it just a fine or can you lose your license?

    We now have a lot of 20mph limits in towns which are so easy to exceed.
     
  15. TonyA

    TonyA VIP MEMBER

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    Jan 16, 2015
    Hello Clive , Are you finding that your speedo is reading a bit high too ?
     
  16. Kid Thunder

    Kid Thunder

    Joined:
    Sep 30, 2018
    Yeah. It seems to be quite high. Yes it would be a speeding ticket but over a certain speed it could be arrest or lost lic.!!!
     
  17. Clive

    Clive VIP MEMBER

    Joined:
    Jun 9, 2017
    No more than other vehicles. We normally assume that there is around 10% allowance for speed cameras so going through at an indicated 35 0r 77 would be safe as it probably equates to a bit over 30 or 70. The real problem at the moment are anpr average speed zones. Fortunately a lot of them have front facing cameras:)
     
  18. Britfan60

    Britfan60 VIP MEMBER

    Joined:
    Jan 5, 2014
    My POS Veglias on the the Bonnie swing so much, I guesstimate somewhere in the middle.:confused:
     
  19. gchoppin

    gchoppin

    Joined:
    Sep 26, 2017
    Does anyone know if having a "real" Bosch sensor helps with indicated speed accuracy? Can't hurt I guess.
     
  20. Kid Thunder

    Kid Thunder

    Joined:
    Sep 30, 2018
    Thanks! Good idea!