View Full Version : rear OHlins spring
Has anyone had a professional set up to their suspension, and if so by whom, and can they tell me the numbers on the spring, and their weight?
Try Kais suspension in Atherton, or maybe Maxton, plus the other usual suspects... JHP, Harris, Techmoto, Cornerspeed, Sigma etc
KAIS - 01942 896366
MAXTON - 01928 740531
I know where the companies are, i was enquiring specifically about the rear spring.
reason being, at jhp yesterday john said i needed to fit a rear spring of 7.5. this has i believe 75 on it. Well i have one of these, if its the one i can save myself £50+.
Andy b - not sure of your experience so I may be teaching granny to suck eggs etc....but Take care with advice from others. Make sure you set the bike up the way it suits you - Not John Hacket or the way neil Hodge has his set-up.
I fitted a heavier spring on Johns recomendation....less preload tension on a heavier spring is supposed to giving a more progressive ride response and better adjustability.
I hated the choppy ride, I spent months trying diferent adjustments with preload, rebound and compression. Eventually I went back to the standard spring.
Its a bit like the front steering head angle - some people will say ohh no leave it alone - nobody races with the steeper head adjustment. I love it, quicker turning without the rear of the bike high in the air gives me the confidence I need to get the power down early without the fear of highsiding.
We all ride a bit differenly.
DJ Tera
15-Jul-2003, 11:46
andy, is your 998S a mono or a bip?
Its a mono, but had hyperpro rear spring when i got it. I have aquired a 75 rear ohlins spring which i suspect is a bip one, a mono being a 65.
DJ Tera
15-Jul-2003, 13:36
I've had a Mono one put onto my bip, I will go outside in a bit and check what the code on the spring says mate!
jhp fitted one to my 748 its 75 onit
Cooking on gas now, got a ride height tool. adjusted my 75 spring to show 25mm thread. this gives a total sag of 30mm on the rear.
distance to datum line is 230mm for ride height. Could do with a bit more perhaps?
we shall see.
skidlids
15-Jul-2003, 18:45
My rear Ohlins has a 6.4Kg/mm spring fitted to it. My unit is off of a SPS and therefore meant for solo riding. Suits me on the race track with my 11 1/2 stone weight. If using a longer arm you will need a stiffer spring, if your using mag wheels you could get away with a lighter spring. Speeds envolved and types of surface will also help determine spring rating, as will the amount of available shock travel.
Er, im 15 1/2 stonnes..... yes i know!
skidlids
15-Jul-2003, 19:39
From my spring calculator I make it that I would have to use a 7.1kg/mm spring if I was to put on another 4 stone in weight, which can,t be far off the mark as that is not far off half the weight of the odd female passenger I know and the spring is just over half way between that for a Mono and a BiP.
Im interested in this spring calculator? can you put it on the site.
Been out on the bike im so pleased with my efforts. I stuck with the loaded sag of 30mm, and raised the rear to a datum measurement of 240mm.
On the real bumpy undulating b road ive used for a test, its feel is much more positive than the hyperpro spring, which was wishy washy in comparison, but its not to the point of kicking me out of the seat.... one happy bunny!!!
skidlids
16-Jul-2003, 00:53
Hi Andy, glad to hear your getting somewhere with the bike, my spring rate calculator is in the form of a excel document that uses an equation I settled on years ago when building specials.
Into it you put in weight of bike and rider, bikes rear weight bias, shocks available travel and the linkage ratio, plus a couple of fixed values.So far I have not yet plotted out the 916 rocker ratio, what I did earlier is arrived at a value for the rocker ratio by working backwards from my 6.4kg/mm spring and then changed the riders weight to give me a new spring rate.
Kev
Ah,i gets you? I wonder what size increments do ohlins springs go up in?
are you better going up or down if theres not one for your weight? or do you have to compromise with the damping settings?
skidlids
16-Jul-2003, 11:54
If the exact spring isn't available, I would go for the next size up, as this will give the damper a bit of a easier time, as a softer spring will cause the damper to travel futher and have a quicker response. which will need extra settings to dial out. Ideal situation is to get the right spring for your weight/riding style and get the shock valved to suit. You may find the Ohlins daming settings and hence the envelope it operates in will cope with a 10% increase in spring rate.
Mark853
16-Jul-2003, 20:12
i've just had my 748s suspension done by JHP. i had olins springs in the forks and an olins spring on the rear.
Result the bike is amazing it is a totaly different bike, how i rode it before i just don't know! Now i have such confidence in the twisty bits it's amazing!
Just get it done trust me.:cool:
Just set my spring on 996s Bip from Hackett's setting as the only way around a corner was to hang right off like a loon!
Hackett's had 21mm of thread showing above the locking ring. This is now down to 13mm! as per Superbike mag suggested i have upper the ride height by 2 turns and now it goes round corners! I'll try it at mallory on Tuesday and see what happens
:devil:
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