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Pinned Rear Shock Data & Swaps

Discussion in 'Tech Tips' started by maelstrom, Aug 20, 2018.

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  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I added a 2005 Ohlins catalogue to the resources section. Might be useful for those wanting to find matching shocks.
     
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    maelstrom, Sep 1, 2018
    #21
  2. TonyZXR

    TonyZXR Well-Known Member

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    Got the spring off the shock today to find out its pooched so a replacement needed . These are the specs for the zxr250A2

    Shock length: 285mm
    Shock stroke: 45mm +13 with no bump stop

    Top Mount:
    Style: eye
    Width: 28mm
    Hole : 12mm

    Bottom Mount:
    Style: Clevis
    Width: 30mm
    Diameter:12mm

    Spring:
    Free length:175
    Wire: 10mm
    Outside: 76mm
     
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    TonyZXR, Feb 17, 2019
    #22
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Great work Tony, but we need the stroke and also the number of coils to calculate the rate.
     
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    Last edited: Feb 17, 2019
    maelstrom, Feb 17, 2019
    #23
  4. TonyZXR

    TonyZXR Well-Known Member

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    Stroke as in the fully compressed spring length?

    That's the amount of coils . Unsure how to measure it so I guess a photo is better . Top and bottom are the ground down type. The top coil is also a tad smaller in diameter
    15503904205922125971068036327858.jpg
     
    TonyZXR, Feb 17, 2019
    #24
  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Feb 17, 2019
    #25
  6. TonyZXR

    TonyZXR Well-Known Member

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    Ohh yeah I already did that . Stroke is 45mm to the rubber bumpstop and another 13mm before it's totally maxed out metal to metal
     
    TonyZXR, Feb 17, 2019
    #26
  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Oct 29, 2019
    #27
  8. TonyZXR

    TonyZXR Well-Known Member

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    When I get a chance i'll try and measure up the zxr250 b shock I've got
     
    TonyZXR, Oct 29, 2019
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    But a 'b' is like an SP model isn't it? Taken me years to work that out. So should be the same if so.
     
    maelstrom, Oct 29, 2019
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  10. TonyZXR

    TonyZXR Well-Known Member

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    Yeah it's from the sp model . Adjustable preload and dampening , also rebuild able (even though there is no specs anywhere...) Spring rate might higher than the ordinary one
     
    TonyZXR, Oct 29, 2019
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  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Or lower, since it is not meant to carry a pillion.
     
    maelstrom, Oct 29, 2019
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  12. Grant J

    Grant J Active Member

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    My Bike:
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    MC22 (Measured off an old bike, rear shock dissasembled)
    Piston stroke (no bump stop) = 45mm;
    Bump Stop thickness = 21mm;
    Spring Dia = 11mm;
    Spring width = 79.5mm top, 81.6mm bottom;
    Relaxed Spring length = 144mm (143.8 in manual);
    Top eye width = 28.5 (measured on the bushing);
    Bottom clevis width = 32mm (internal)
    I've pulled 2 of these apart now and both have had 110mL of oil inside them.
    If you are keen you can seperate the piston and the shim stack on both compression and rebound and measure them. I am not that keen yet.
     
    • Nice Work Nice Work x 1
    Grant J, Jan 29, 2020
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  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Thanks @Grant J. Just to clarify, there is 45mm of travel before the bump stop is reached?
    I added the info and also added a column for bump rubber thickness.
    Cheers
    Blair
     
    maelstrom, Jan 29, 2020
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  14. Grant J

    Grant J Active Member

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    No, I had the bump stop off the piston shaft at this stage so I just measured the full piston stroke, bottom out to top out. I'm guessing these rubbers are in all different stages of hardness and thickness by now, with very few of them ever being changed or replaced.
     
    Grant J, Jan 29, 2020
    #34
  15. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Okay, I changed the image on the web page and also the stroke value to 24mm.
    DrawingBlank.jpg
     
    maelstrom, Jan 29, 2020
    #35
  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Apr 29, 2020
    #36
  17. TonyZXR

    TonyZXR Well-Known Member

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    Got some measurement of the zxr250 b shock.
    4 dampening settings

    Length: 285mm
    Stroke: 42mm
    Bump rubber: 20mm

    Top mount
    Style: eye
    Width: 27.77mm
    Hole: 12mm

    Bottom mount
    Style: clevis
    Width: 28.35mm
    Hole: 12mm

    Spring
    Free length: 166mm
    Wire: 10.20mm
    Outside diameter: 77mm
    Active coils: 4

    Sent from my SM-N960F using Tapatalk
     
    TonyZXR, Apr 29, 2020
    #37
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Thanks @TonyZXR, those are free spring length and diameter, yes?
    added to table spring rate calcs at 9.2kg/mm
     
    maelstrom, Apr 29, 2020
    #38
  19. TonyZXR

    TonyZXR Well-Known Member

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    Yep that's all right. Didn't expect the clevis to be smaller, that was a surprise , lucky i got the lower link with it

    Sent from my SM-N960F using Tapatalk
     
    • Informative Informative x 1
    TonyZXR, Apr 29, 2020
    #39
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