Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > General Motorcycles only > ohlins springs

[Bungi]

ive come accross 2 ohlins rear shock spiring,

can anyone advise me what the relevent numbers on the spring mean?

1091-31/95 L090
1091-29/90 200,

can i fit one of these springs on to a showa rear shock?

[Shazaam!]

Yes, they can be used with a Showa shock.

1091-31 is the Ohlins code for a 160mm (6.3 in) long 57mm I.D. spring having a spring rate of 95N/mm (542 lbs/in). Suitable for a monoposto rider+gear weighing more than 265 lbs. or a biposto rider+gear weighing 235-245 lbs.

where:
/95 = 90N/mm stiffness
L090 = production batch number

1091-29 is the Ohlins code for a 160mm (6.3 in) long 57mm I.D. spring having a spring rate of 90N/mm (514 lbs/in)
Suitable for a monoposto rider+gear weighing 245-265 lbs. or a biposto rider+gear weighing 220-235 lbs.

where:
/90 = 90N/mm stiffness
200 = production batch number

The following table lists the Öhlins rear springs for Ducati applications and rider weights:

[Gizmo]

Shazaam, you dont know what the max preload on a 160 log spring is do you?? i've ben running 2 springs, one of which had a preloaded length of 142mm and was a bit concerned as to whether 18mm was ok.

[Bungi]

thank you

[Shazaam!]

Gizmo,

Ohlins says that the allowable deflection of their 160mm-long springs is between 75 and 85mm total. The lower value is for the stiffer springs. Preloading to 18mm (or any other number) proportionally reduces the available suspension travel.

[Gizmo]

Originally posted by Shazaam!
Gizmo,

Ohlins says that the allowable deflection of their 160mm-long springs is between 75 and 85mm total. The lower value is for the stiffer springs. Preloading to 18mm (or any other number) proportionally reduces the available suspension travel.

Thanks Shazaam - the shock stoke on a 999 is 71mm so on a low (64-70 nm) spring I guess 14 mm (146 compressed) is about the absolute max if the shock can actually get to a full 71mm before theres a risk of coil binding

Have you ever fully compressed a spring until it coil binds and measured the deflection??? I've got a couple of Ohlins springs and a K tech, I need to check with them what that one is, i've seen instances where a small change in spring thickness ( diameter) mean it coil binds before it should.

the other thing i'm working on is rear ride height, moved up to 287 mm to allow for more sag yet owners manual say 285 is max. means i can run 5 - 6mm more sag and a bit softer but keep the same head angle. I can't work out why they say 285

[Shazaam!]

The 285mm maximum is to assure that a sufficient number of threads remain engaged in the tie rod adjuster.

[Bungi]

shazaam

please help me understand why is the spring that was std on my 996r rated so differantly .

aparently on my track bike 916 mono the rear spring fiited to ohlins shock is a hyperpro which apparently is wrong beacse its ment for a mag swing arm which the bike does not have, i want to replace the spring and be sure to put the best one i have on it, the std 996r spring i have is spare as ive previously fitted a hyperpro on my 996r

[Gizmo]

Originally posted by Shazaam!
The 285mm maximum is to assure that a sufficient number of threads remain engaged in the tie rod adjuster.

thought it might be that, i'm less than1 turn out at each end which should be ok. might try and make a longer tie bar if i like the higher height.

it looks like it might also compress shock a little