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Spring reccomendation

Started by Howie, January 13, 2015, 05:06:28 AM

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Howie

January 13, 2015, 05:06:28 AM
My '04 M1000 S  is getting an Ohlins S46PR1C1S shock.  I weigh 145 without gear.  What spring do I need?

ducpainter

#1
January 13, 2015, 05:09:06 AM
Call Eric... :P
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Howie

#2
January 13, 2015, 05:15:09 AM
Doh!  Good idea!  Don't want to bother him so I will send him an email.

Thanks!

ducpainter

#3
January 13, 2015, 05:37:11 AM
Quote from: howie on January 13, 2015, 05:15:09 AM
Doh!  Good idea!  Don't want to bother him so I will send him an email.

Thanks!
He lives on the phone. ;)

Just call after 9 when he gets to the shop. He can probably supply it too.

Can't hurt to ask.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


MonsterHPD

#4
January 13, 2015, 07:46:27 AM
Quote from: howie on January 13, 2015, 05:06:28 AM
My '04 M1000 S  is getting an Ohlins S46PR1C1S shock.  I weigh 145 without gear.  What spring do I need?

I weight slightly less, ride mostly 1-up, and use a 95N/mm spring on one bike, and 100N/mm on the other (Monster 900-02 and 800-03; same frame as you have).

I've tried an 85N/mm once, definitely too soft. 100N/mm would be my recommendation.   
Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-now with tuned ST2 motor and Microtec ECU. Also parked due to having been T-boned on track.

Howie

#5
January 13, 2015, 09:33:43 AM
Thanks.  I should have mentioned mostly shitty condition New York street riding.  Same recommendation?

1.21GW

#6
January 13, 2015, 09:59:34 AM Last Edit: January 13, 2015, 10:02:55 AM by 1.21GW
My recommendation for the spring?  Update your spell check function.   ;)


Meanwhile, in other news, I need to arrange a meet up to get that helmet case from you.  Trip is 2.5 weeks away...
"I doubt I'm her type---I'm sure she's used to the finer things.  I'm usually broke. I'm kinda sloppy..."

MonsterHPD

#7
January 13, 2015, 10:25:47 AM
Quote from: howie on January 13, 2015, 09:33:43 AM
Thanks.  I should have mentioned mostly shitty condition New York street riding.  Same recommendation?

Well, for me I'd stick with the springs I have, but in the end only testing will tell. I suppose a well-established suspension shop could swap the spring for you for a reasonable fee, should you not be happy with the first shot.  For street riding I personally prefer slightly softer springs with slightly more pre-load, but too soft does of course does not work at all.   
Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-now with tuned ST2 motor and Microtec ECU. Also parked due to having been T-boned on track.

Howie

#8
January 13, 2015, 10:26:49 AM Last Edit: January 13, 2015, 10:30:30 AM by howie

Quote from: 1.21GW on January 13, 2015, 09:59:34 AM
My recommendation for the spring?  Update your spell check function.   ;)


Meanwhile, in other news, I need to arrange a meet up to get that helmet case from you.  Trip is 2.5 weeks away...

Got it correct once, wrong once.  Batting 500, that ain't bad :P

Didn't know you wanted the bag.  You could have had it Friday, we were in Brooklyn.  Wanna make a trip up to the Bronx?

Howie

#9
January 13, 2015, 10:31:36 AM
Quote from: MonsterHPD on January 13, 2015, 10:25:47 AM
Well, for me I'd stick with the springs I have, but in the end only testing will tell. I suppose a well-established suspension shop could swap the spring for you for a reasonable fee, should you not be happy with the first shot.  For street riding I personally prefer slightly softer springs with slightly more pre-load, but too soft does of course does not work at all.   

Thank you.  Just what I was looking for.

ducpainter

#10
January 13, 2015, 10:44:43 AM
Quote from: MonsterHPD on January 13, 2015, 10:25:47 AM
Well, for me I'd stick with the springs I have, but in the end only testing will tell. I suppose a well-established suspension shop could swap the spring for you for a reasonable fee, should you not be happy with the first shot.  For street riding I personally prefer slightly softer springs with slightly more pre-load, but too soft does of course does not work at all.   
I prefer a slightly stiffer spring with less pre-load...go figure.

My experience is the more preload on a spring the harsher the ride, particularly on the kinds of roads we have in the northeast.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Speeddog

#11
January 13, 2015, 11:34:19 AM
I'd go along with the 100 N/mm spring recommendation for you, Howie.

I'd ask Eric about taking out some compression damping prior to putting the shock on the bike.

IMO:
The Ohlins seem to be set up with the firm damping/soft spring philosophy.
Good for racetrack, but not so compliant on sharp-edge bumps in the real world.
Both of my Ohlins-equipped bikes ('02 S4 and '98 M750) I've got the compression damping adjust at full soft, or as soft as I can go without it getting wallowy.
The compression damping adjust is primarily effective at low shaft speed, so 'fixing' a high-speed damping issue with it is a compromise.
Both shocks will get shims removed from the compression stacks the next time they're serviced.
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MonsterHPD

#12
January 13, 2015, 11:37:33 AM
Quote from: ducpainter on January 13, 2015, 10:44:43 AM
I prefer a slightly stiffer spring with less pre-load...go figure.

My experience is the more preload on a spring the harsher the ride, particularly on the kinds of roads we have in the northeast.

I suppose we're talking nuances here. If the softer and stiffer springs are pre-loaded to give the same initial force, the softer spring will require less force for the same wheel travel than the stiffer, which, on the other hand, will provide more reserve. .

However, as noted above, too soft is absoutely bad, and too soft a spring might allow the travel to reach massively into the bump rubber, I suppose that would give a harsh suspension action on big bumps.
Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-now with tuned ST2 motor and Microtec ECU. Also parked due to having been T-boned on track.

MonsterHPD

#13
January 13, 2015, 11:39:42 AM
Quote from: Speeddog on January 13, 2015, 11:34:19 AM

Both shocks will get shims removed from the compression stacks the next time they're serviced.

I did that to my M900 shock last year, and have just done so for the M800 now. Big improvement! 
Monster 900-2002 (sold, alive and well in the UK), 749R / 1100 HYM combo for track days, wifes / my Monster Dark 800-2003 (not entirely "Dark" anymore and a personal favourite) , 50% of 900SSie -2000 track bike for rainy days-now with tuned ST2 motor and Microtec ECU. Also parked due to having been T-boned on track.

ducpainter

#14
January 13, 2015, 12:24:53 PM
Quote from: MonsterHPD on January 13, 2015, 11:37:33 AM
I suppose we're talking nuances here. If the softer and stiffer springs are pre-loaded to give the same initial force, the softer spring will require less force for the same wheel travel than the stiffer, which, on the other hand, will provide more reserve. .

However, as noted above, too soft is absoutely bad, and too soft a spring might allow the travel to reach massively into the bump rubber, I suppose that would give a harsh suspension action on big bumps.
Agreed, except the preload required to maintain correct sag on a softer spring, and the force to initiate movement might very well exceed the force to get the stiffer spring moving at the preload required to maintain sag. Once moving the rate is the rate.

My old DU-440 seems to damp fine with a stiffer spring Nick.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


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