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Griso rear suspension travel and its increase.

Discussion in 'Griso-Bella Chat & Tech' started by TweeZ4, Mar 12, 2019.

  1. TweeZ4

    TweeZ4 Tuned and Synch'ed GT Famiglia

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    A couple of preliminary questions:

    1) Griso rear suspension travel is 110 mm per specs. But shock stroke is limited by bump stop. Does this mean that maximal suspension travel in reality is less than 110 mm? Because bump stop "eats" the stroke:)

    2) Lets assume that the statement above is correct.
    And lets compare Griso (110 mm rear travel) vs Breva/Norge(140 mm rear travel).
    Assume that bump stop is 10 mm thick on both bikes and there is no suspension progression via travel (its not the case in reality, but lets assume). And suspension travel /shock stroke ratio= 2.5
    Is than Griso's effective suspension travel is 85 mm=110 - (10*2.5) and Breva's 115=140-(10*2.5)

    So, the question:
    I want a softer, SUV-type ride on a Griso.

    Is mounting Breva's/Norge's rear shock on a Griso will give me longer suspension travel and will help with softer ride?
    Are shocks interchangeable?

    P.S. I've read the case that a man mounted Stelvio's rear shock onto Griso and happy now, but its too much for me.
    P.S. Yes, I know about bike riding geomenty, sag, front to end balance. spring rates etc.
     
    Last edited: Mar 12, 2019
  2. GuzziMoto

    GuzziMoto GT Reference GT Contributor

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    The suspension travel published would be including the effects of the bump stop. The published suspension travel is not reduced by the factory bump stop.
    Longer suspension travel does not directly equate to a softer suspension.
    A better rear shock, with the right rate spring and matching damping, should give you a better ride. Bolting up a stock Norge / Breva rear shock likely will not give you a better ride.
     
    Trout and GT-Rx® like this.
  3. TweeZ4

    TweeZ4 Tuned and Synch'ed GT Famiglia

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    Longer suspension travel have advantage in terms of achievable comfort on the bad road.

    And.... I have front and rear Matris setup with all (preload, compression, rebound) with right springs on my V9, and what this bike lacks is rear suspension travel. I mean on the roads I ride :)
    So does the Griso.
     
  4. GT-Rx®

    GT-Rx® Administrator Staff Member

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    The Griso shock is undersprung for most riders, and too firm of valving unless you are on the racetrack, and even then it's not great.
    The Breva/Norge shock is softly spung and softly valved, and is arguably worse than the Griso shock. I don't recommend it.
    The Stelvio shock is 25mm longer, and is also not great as to ride.
    In order to achieve what you want, it is best to have a shock made for your weight and riding desires.
    I've put a very affordable shock online here; https://gtmotocycles.com/collections/suspension/products/gtm-mshock -- all listed here; https://gtmotocycles.com/collections/suspension/model_griso-1200?sort_by=price-ascending
     
  5. GuzziMoto

    GuzziMoto GT Reference GT Contributor

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    While more travel does add the POSSIBILITY of a more comfortable ride, it does not automatically deliver a better ride. The ride quality is determined by the spring rate and valving of the shock, and to a lesser extent by the length of the shocks travel. But travel is only an issue when you don't have enough. The Griso has enough travel to deliver a nice ride if the shock has the right spring rate and valving. If you have a motorcycle that does not have enough suspension travel running a longer shock can add suspension travel, but only at the cost of a higher seat height and possible issues with altered geometry to deal with. Installing a better quality shock that is properly sprung and valved WILL improve ride comfort. I have ridden more than a few motorcycle with aftermarket shocks that were sprung and valved for my weight. It is an easy improvement that you will not get by installing a stock Breva / Norge or Stelvio shock on a Griso.
     

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