Ohlins Spring Chart Pdf
1200gs with olins from Dan Kyle Racing. Am about to send in the rear shock for a second time. The first time we determined I needed a softer spring. I did not see much if any difference.
The spring I have is a 00698-64/160 L476. Searching around I see one rider has a 59/150/257 and another has a 39/110 L213. The problem is almost no sag when riding alone (15mm). The rear wheel tries to come off the ground. Fully loaded is about wright with no pre-load adjustment put in. With suit on I weigh about 210.
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I need a heads up before I call Dan this time. I feel your pain!! You are right, the spring supplied for the standard GS is way to stiff. I'm 170lbs and the 130 sping allows for almost no sag statically.
I took my shock to Dan so I could reduce the pre load(you have to dismantle it to do so). Even with the preload backed all the way off its still to stiff. Get the next lowest spring rate! Dan is wrong about this issue.I've reduced the rebound damping to acceptable levels and it helped. Oddly my 1200GSA with Olins is perfect but I have a more sophisticated shock on it.
Here is what I know. Assuming the Ohlins spring rates have stayed the same since 2005. These numbers are for the standard GS and not the adventure. I feel your pain!! You are right, the spring supplied for the standard GS is way to stiff. I'm 170lbs and the 130 sping allows for almost no sag statically.
Ohlins Spring Chart Pdf
I took my shock to Dan so I could reduce the pre load(you have to dismantle it to do so). Even with the preload backed all the way off its still to stiff. Get the next lowest spring rate! Dan is wrong about this issue.I've reduced the rebound damping to acceptable levels and it helped.
Oddly my 1200GSA with Olins is perfect but I have a more sophisticated shock on it. 1200gs with olins from Dan Kyle Racing. Am about to send in the rear shock for a second time. The first time we determined I needed a softer spring.
I did not see much if any difference. The spring I have is a 00698-64/160 L476. Searching around I see one rider has a 59/150/257 and another has a 39/110 L213. The problem is almost no sag when riding alone (15mm). The rear wheel tries to come off the ground. Fully loaded is about wright with no pre-load adjustment put in.
With suit on I weigh about 210. I need a heads up before I call Dan this time.
Ohlins Spring Chart
Some additional thoughts, The number we change is the Force due to that rate and preload and sag added, resulting in some big force number. As in the following: F=kdx Where F = the resulting force due to preload and sag together. 'dx' is the change in the distance from the free length the spring to compressed. 'k' is the spring rate from above, that 571 lbf/in of deflection. Also in a steel compression spring you are going to be hard pressed to change this spring rate. That is unless the spring somehow loses its temper, or is compressed beyond its elastic limit. About the only way I guess to do this would be to compress the springs to coil-bind, (coils compressed such that they touch), and then leave them there for a very long time.
Or both that and add some heat, (that old lowering the car trick form the fifties). Still this will simply shorten the overall length of the spring the rate is constant, (Unless you use heat, then all bets are off which is why that method of dropping a car was a bit hit or miss). Or for all practical purposes a constant.
There is a bit of non-linerarity but the affects of that are small, thrid order or so, has to do with damping in the spring itself. If I remember correctly It has been a while since I messed with this stuff. What feel like spring rate change in a coil-over shock system is not the spring rate changing but more likely the compression damping changing. This rate can and does change along with the rebound damping rate over use and time as these are a function of the states of the oil, seals, and charging gas. It should be fairly simple calculation to find the close-enough spring rate as a function of sag. Fun too.:huh I think it will require some paper, a pencil, camera measuring tape, then a computer and some alcohol. You know to keep everything clean.
So, is everyone ready for their homework? Remember to show your work, and remember units are important! I have never measured the sag on my bike. In 2009 I weighed 195 lbs.
Today I weigh 220 without a helmet. The guys at Ted Porter's BeemerShop are recommending a '170' rear spring for my '07 R1200GS.
It has BMW adventure cases on it at all times. Empty when I commute they weigh 15 lbs each and 25 lbs each when I'm camping. When camping I also carry a 16 lb duffle. I know nothing about suspension tuning. I've ridden the bike 50K miles with a '150' spring. In your collective opinion, will the 170 be too stiff?
1091-34/100 is an example of a code you will find on an Ohlins shock spring. Using the below charts you can “decode” what you are looking. The 1091 refers to the diameter and the length of the spring. Almost all Ohlins springs have a diameter of 57mm so that’s easy, the 1091 in this case means it has a 160mm length (when not on the shock).
The -34 is the spring rate. For some unknown reason Ohlins uses it’s own numbers to label rate, but below on the rate conversion chart you can cross reference this number. In this case a -34 is a 100nm or 10.19kg or 571lb spring. The /100 is the springs rate in Newton meters, but without the decimal. In this case the /100 means it’s a 100nm spring. Dan Kyle 1098 Shock Spring Recommendations NOTE!!!!! This is with 12 to 16 MM of preload on the spring!!!!!!
Note weights are rider weight with gear, or take your weight and add 15 lbs for gear. 140-160 Lbs 80.0 Nmm 160-180 Lbs 85.0 Nmm 180-200 90.0 Nmm 200-220 95.0 Nmm 220-240 100 Nmm 240-260 105 Nmm 260-280 110 Nmm How To Read An Ohlins Spring Code 1091-34/100 is an example of a code you will find on an Ohlins shock spring. Using the below charts you can “decode” what you are looking. The 1091 refers to the diameter and the length of the spring. Almost all Ohlins springs have a diameter of 57mm so that’s easy, the 1091 in this case means it has a 160mm length (when not on the shock) The -34 is the spring rate.
For some unknown reason Ohlins uses it’s own numbers to label rate, but below on the rate conversion chart you can cross reference this number. In this case a -34 is a 10nm or 10.19kg or 571lb spring The /100 is the springs rate in Newton meters, but without the decimal.
In this case the /100 means it’s a 10.0nm spring. Pinched from here.