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 Stelvio shock on a GRiSO riding impressions

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Buellbloke
RedMogAndy
Clancy
Macgyver
Doc.
lcjohnny
Oz1200Guzzi
pauldaytona
EricS
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bjor
Tanabuso
Tanabuso
bjor


Posts : 84
Join date : 2021-11-17

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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Sat Mar 26, 2022 4:24 am

Thanks for good info Jon Smile
So basically what I need is a spring that has the same dimension as the original (57x188), but just stiffer...
My ready-to-go-weight is 80-85 kg, -maybe the original one is stiff enough?
If not, I would be happy to get some links, since I can't find any local suppliers at a first glance...
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lcjohnny
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lcjohnny


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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Sat Mar 26, 2022 6:51 am

These are the faulkner springs at Demon Tweeks  demon tweeks (cheaper than getting them from Faulkner themselves).

Brook suspension do longer springs so a better fit but you need to contact them for the spring you want as their springs are now listed by bike, not by dimension, - and they no longer list for the GRiSO Brook spring linky
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rick pope
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rick pope


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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Sat Mar 26, 2022 7:41 am

Or, just pony up for a brand spanking new shock of decent quality and don't fool with trying to get the right springs/preload/etc. I bought a shock from GTM on the advice of my dealer, and have been very pleased so far. I have a couple thousand miles on it and am happy with the settings as shipped.

I don't remember what I paid, which is a good indicator that I'm happy enough to not care. [You must be registered and logged in to see this image.]
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Buellbloke
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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Sat Mar 26, 2022 8:54 am

The Hagon seems to be the best bang for buck, about £400 sprung to weight, its very popular with all guzzi people in the UK.
Its about £250 these days for a used imported Stelvio shock and a new spring.
Have heard of the pre load adjuster failing too so there is also that to consider.

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lcjohnny
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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Sat Mar 26, 2022 9:20 am

I have an 11kg/mm 185mm spring in red, scratches from removal and refitting but £10 plus postage?
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svru
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svru


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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Sat Mar 26, 2022 10:54 am

bjor wrote:

If not, I would be happy to get some links, since I can't find any local suppliers at a first glance...

Motorspeed.no will happily supply you with the yellow Ohlin ones. I have tried a 140N/mm, but ended with a 110, search for "SPRING 57/180/110". About your weight and happy with original performance, not great, but acceptable.
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bjor
Tanabuso
Tanabuso
bjor


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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Sun Mar 27, 2022 3:06 am

lcjohnny wrote:
I have an 11kg/mm 185mm spring in red, scratches from removal and refitting but £10 plus postage?

Thanks for the offer, could be interesting!
I'll check out the local supplier that Svein tells about first.

However, with my 75 kg + gear, could 11 kg/mm be to much?
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bjor
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bjor


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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Mon Mar 28, 2022 2:50 am

svru wrote:
bjor wrote:

If not, I would be happy to get some links, since I can't find any local suppliers at a first glance...

Motorspeed.no will happily supply you with the yellow Ohlin ones. I have tried a 140N/mm, but ended with a 110, search for "SPRING 57/180/110".

So you think  110 N/mm would be suitable for a 75 kg + gear-fellow?
(kunne jo skrive på norsk også, men...)
mvh Bjørn
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svru
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svru


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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Mon Mar 28, 2022 8:07 am

Original is undersprung. The spring action is not that different in area you use the most. Difference is mostly at full compression. A heavy spring can be more plush initially as you need less preload. Problem for me with the 140 spring was almost zero preload to get close to a SAG at the very sporty side. But the 110 sits about perfect at 10mm preload and SAG at about 33mm. Original preload is about 19mm.

I think weight difference between us is less than 5 kg. I used the be 10 kg more than today, but even now when using light riding gear I am still happy with the shock. The bike is really stable and likes a bit of inspired cornering action. It is sporty at the firm side.
I have installed Mupo valves in the front.

Added: the shock is more adjustable with a more suitable spring.

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bjor
Tanabuso
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bjor


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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Mon Mar 28, 2022 6:05 pm

Thanks for good and clarifying info, Svein!
Maybe we meet on the road this summer Smile
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lcjohnny
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PostSubject: Re: Stelvio shock on a GRiSO riding impressions   Stelvio shock on a GRiSO riding impressions - Page 5 Icon_minitime1Tue Mar 29, 2022 12:00 am

GRiSO shocker - the actual wheel and suspension travel of a both the GRiSO standard shock absorger and the Selvio shocker is quite limited.

GRiSO shock -compressed length 285mm (firm against bumpstop) +  shock stroke of 35mm => 77mm wheel travel Sad

Stelvio shock -compressed length 285mm (firm against bumpstop) + shock stroke of 45m => 99mm wheel travel Sad

I mounted the shock body with no spring, all linkages tight and measured the wheel movement as the shock absorber compressed in 5mm increments until the bike was lifting off the stand on the bump stop rubbers (2-4mm more movement may be available).

Because the Stelvio shock is longer when fully extended it will give a higher riding position if the spring preload is high enough to support it.
Standard spring rate of 9.69 N/mm seems enough for riders of 65Kg but the shock will bottom very easily for heavier riders or with luggage/ pillion.
105Kg riders seem to need 13 N/mm

Bad news is that both shock absorbers give less wheel travel than advertised Sad   & That also means that the 25-50% target rider sag needs to be a smaller figure

BtW the linkage ratio averages 2.2:1 wheel movement to shock aborber movement over the full range (peaking at around 2.4:1)


Last edited by lcjohnny on Wed Mar 30, 2022 3:21 am; edited 1 time in total (Reason for editing : added some information)
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