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Spring rate?

Old 05-22-2019, 04:36 PM
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Spring rate?

So just got my Penske shock rebuilt by a race buddy at the track. He mentioned how strong a spring the shock had. It is a 950lb shock. I remember putting it on since I was always riding 2 up with 3pc luggage.

What are you guys running? I am @ 190lbs.
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Old 05-23-2019, 03:20 AM
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Oem still, 38 psi rear iirc.

In the front I reduced the air gap by 10mm and used Honda brand 10 weight oil. It's nice combo Steering damper too. I'm 180 ish these days, probably 190 with some gear on.

Hows that oil leak? Any luck?
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Old 05-23-2019, 04:31 AM
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Oil leak? Anyone know stock spring rate? Been riding it in the time the Penske was built, seems super soft.
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Old 05-23-2019, 01:51 PM
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Originally Posted by smokinjoe73 View Post
Oil leak? Anyone know stock spring rate? Been riding it in the time the Penske was built, seems super soft.
Belay me last, mixed up my users again...

AV
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Old 05-23-2019, 07:04 PM
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Hmm.

So not hearing a lot of support for spring rate info.

Ready?......GO
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Old 05-24-2019, 01:55 AM
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Originally Posted by smokinjoe73 View Post
Hmm.

So not hearing a lot of support for spring rate info.

Ready?......GO
Right,got carried away...

Unfortunately everyone I know goes through a painful process of trial and error. All swear that the calculators are wrong and largely a waste of time. Having an extra spring or two laying around cant hurt though, maybe someone on here will buy it.
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Old 05-24-2019, 02:27 AM
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Yeah, I have 2 spares but they don't have the spring rate on them. One is from an RC31 but I have yet to track down what the weight of that bikes spring is.
The other is unknown but I think its close as I got them for the VTR way back when.
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Old 05-26-2019, 08:59 AM
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Originally Posted by smokinjoe73 View Post
Hmm.

So not hearing a lot of support for spring rate info.

Ready?......GO
Stock Spring Rate:16.4 kg/mm (916lbs/in)
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Old 05-26-2019, 08:33 PM
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Erik thanks,
So my 950lb spring should not be too far off for a 190lb rider?
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Old 05-27-2019, 05:03 AM
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Originally Posted by smokinjoe73 View Post
Erik thanks,
So my 950lb spring should not be too far off for a 190lb rider?
Springs support weight....if you can get proper sag with that spring.. and your shock tune controls that spring, you have the right spring
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Old 05-29-2019, 03:15 PM
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Shameless plug for Cogent Dynamics. https://www.motocd.com . Rick has set up my race bikes, street bikes and dual sport bikes for many years. 828.628.9025, [email protected] He's great. Tell him I sent you and get charged double!

Last edited by YMRacing; 05-29-2019 at 03:18 PM.
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