Author Topic: Spring rates  (Read 4186 times)

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  • Offline Cazzy_R   england

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    Offline Cazzy_R

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    Spring rates
    on: May 23, 2019, 05.58 pm
    May 23, 2019, 05.58 pm
     Zed9 thoughtfully shared that his rear shock was re-sprung with a 700lb/in (120N/mm) for his riding weight of 200lb (90kg). Fork springs at .95N/mm
     I'm 250lbs (115kg) in gear and I wonder what spring rates would be correct for my weight?
     Are there any rider weight charts/tables for the Z900 out there?
    Tighten it 'til it strips then back it off half a turn.

  • Offline cjskinner   ca

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    Re: Spring rates
    Reply #1 on: May 23, 2019, 06.30 pm
    May 23, 2019, 06.30 pm
    I would love to know too! Donít even know how to adjust my suspension for my weight lol
    OES Frame Slider - RhinoMoto Bar End - Chinese Mirror -  Chinese Windscreen - EBC Brakes pads - Leovince Full System - ECU 2WheelDyno - Chinese Seat Cover - Brocks Heavy Spring - Road 5 - MotoDynamic Integrated TailLight - Full Givi Luggage System - Sprint AirFilter - TankSlapper - Fender Eliminator - Ergo Seat - EvoTech Rad Guard - Liqui Moly Oil -

  • Offline MiNuS31   us

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    Offline MiNuS31

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    Re: Spring rates
    Reply #2 on: May 23, 2019, 06.41 pm
    May 23, 2019, 06.41 pm
    Im 280lbs with gear...I ordered a K Tech rear suspension...when you order it from Revzilla.com they let you select a weight option...after it was installed I adjusted the sag, rebound etc for front and rear...now when I accelerate I dont get that sag feel and when I hit bumps I just eat it and not bounce constantly...rear shock is nitrogen filled too so it feels the same constantly...some oil shocks loosen up when warm...

  • Offline zed9   us

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    Offline zed9

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    Re: Spring rates
    Reply #3 on: May 23, 2019, 07.13 pm
    May 23, 2019, 07.13 pm
    *Originally Posted by Cazzy_R [+]
    Zed9 thoughtfully shared that his rear shock was re-sprung with a 700lb/in (120N/mm) for his riding weight of 200lb (90kg). Fork springs at .95N/mm
     I'm 250lbs (115kg) in gear and I wonder what spring rates would be correct for my weight?
     Are there any rider weight charts/tables for the Z900 out there?
    Race Tech has a chart on their site. You combine total weight of bike and rider. Then you decide whether you want sport or racing rates.
    At your weight I'd say your fork springs would be 1.0 kg rate for the street.

  • Offline Cazzy_R   england

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    Offline Cazzy_R

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    Re: Spring rates
    Reply #4 on: May 23, 2019, 08.40 pm
    May 23, 2019, 08.40 pm
    *Originally Posted by zed9 [+]
    Race Tech has a chart on their site. You combine total weight of bike and rider. Then you decide whether you want sport or racing rates.
    At your weight I'd say your fork springs would be 1.0 kg rate for the street.

     Thanks for that. I found the spring rate calculator. Your fork spring estimate was spot on.  :047:
     The z900 wasn't in the drop down list so couldn't get a rate for the rear though.  :003:
    Tighten it 'til it strips then back it off half a turn.

  • Offline Cazzy_R   england

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    Offline Cazzy_R

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    Re: Spring rates
    Reply #5 on: May 23, 2019, 08.42 pm
    May 23, 2019, 08.42 pm
    *Originally Posted by MiNuS31 [+]
    Im 280lbs with gear...I ordered a K Tech rear suspension...when you order it from Revzilla.com they let you select a weight option...after it was installed I adjusted the sag, rebound etc for front and rear...now when I accelerate I dont get that sag feel and when I hit bumps I just eat it and not bounce constantly...rear shock is nitrogen filled too so it feels the same constantly...some oil shocks loosen up when warm...

     Good to hear that the Razor is up to the task.  :152:
    Tighten it 'til it strips then back it off half a turn.

  • Offline zed9   us

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    Re: Spring rates
    Reply #6 on: May 23, 2019, 10.36 pm
    May 23, 2019, 10.36 pm
    *Originally Posted by Cazzy_R [+]
    Thanks for that. I found the spring rate calculator. Your fork spring estimate was spot on.  :047:
     The z900 wasn't in the drop down list so couldn't get a rate for the rear though.  :003:
    I didn't see it either. The guy I had rebuild my suspension  knew about the linkage for the shock and he determined the 700 in/lbs so I'm assuming you'd be the next step up as well. Forks by Matt understands this stuff so he may be able to answer.

  • Offline Forks-by-Matt   us

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    Offline Forks-by-Matt

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    Re: Spring rates
    Reply #7 on: May 23, 2019, 10.39 pm
    May 23, 2019, 10.39 pm
    Racetech's database/calculator can be completely off sometimes. I've seen some doozies out of their site on certain bikes.

    I'm 250lbs (115kg) in gear and I wonder what spring rates would be correct for my weight?
    0.95kg/mm fork,
    650 lb/in or 115N/mm shock

    Are there any rider weight charts/tables for the Z900 out there?
    I use this one and round down for street use. I can't find the original  on Max's site.
    http://forks-by-matt.s3.amazonaws.com/spring%20rate.gif

    There's a fair bit of stuff for public consumption.
    http://forks-by-matt.s3.amazonaws.com/index.html
    Last Edit: May 23, 2019, 10.42 pm by Forks-by-Matt
    Good suspension doesn't have to be expensive.

  • Offline zed9   us

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    Offline zed9

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    Re: Spring rates
    Reply #8 on: May 23, 2019, 11.17 pm
    May 23, 2019, 11.17 pm
    *Originally Posted by Forks-by-Matt [+]
    Racetech's database/calculator can be completely off sometimes. I've seen some doozies out of their site on certain bikes.
    0.95kg/mm fork,
    650 lb/in or 115N/mm shock
    I use this one and round down for street use. I can't find the original  on Max's site.
    http://forks-by-matt.s3.amazonaws.com/spring%20rate.gif

    There's a fair bit of stuff for public consumption.
    http://forks-by-matt.s3.amazonaws.com/index.html
    Max's chart for the forks shows the same .95 as the Race Tech for my ~700 pound weight. The .95 are not stiff at all in fact he shows a 1.0 but I'm assuming that's for the race track.
    Last Edit: May 23, 2019, 11.19 pm by zed9

  • Offline Cazzy_R   england

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    Offline Cazzy_R

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    Re: Spring rates
    Reply #9 on: May 24, 2019, 12.02 am
    May 24, 2019, 12.02 am
    *Originally Posted by Forks-by-Matt [+]
    0.95kg/mm fork,
    650 lb/in or 115N/mm shock

    Cool. Thanks Matt. 👍

    Tighten it 'til it strips then back it off half a turn.