Ohlins Spring for M900 (1995), 300-310 Pound Rider

[koko64]

Have a 300-310lb customer and sorting the suspension on his 1995 M900.

Looking at the Ohlins chart, I see that a 54 spring is 14nm or 14.3ish kg/mm  (or an 800 pounder). Another Ohlins chart recommends a 12 or 13kg spring for 275lb riders which would be in the 700-750 lb range, so I guess I'm in the ballpark with the no 54, 800 lb spring.

Can anyone confirm this ?

Ill try a spring on the shock, but will give the forks to my suspension bloke.

[stopintime]

I know a guy in that weight range.

He recently put on a 130Nm spring and says it's perfect. It requires a 'strong' return damping circuit, so keep that in mind.

 

[ducpainter]

Linkage ratios are different on the M900 (early bikes), and the S*R bikes.

The early bikes use less spring due to the differences.

[koko64]

I have a real appreciation of the bell crank linkage of the Monster/851/888. I notice how supple my M750 is on crap roads compared to the hard angle cantilever on my Evo.
The 800lb Ohlins spring is from a Honda sports bike that has a very strong leverage to its shock linkage which backs up a comment Speeddog made years ago. The spring was too light for a  220 pound rider on that CBR as Honda use very heavy springs for their linkage set ups.

[ungeheuer]

...what are these.... pounds .... of which you speak??

[koko64]

...what are these.... pounds .... of which you speak??

Those Eibach springs.. Good thing I'm old enough to know both metric and imperial.