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My R1 is MY ROAD DAWG 4 LIFE
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Discussion Starter #1 (Edited)
I just recently purchased an Ohlins rear shock (TTX36) for my 08 R1. And like most people when receiving something new, and spending your hard earned cash. My concern was, does the shock have the correct spring rate for my weight. Even though, I gave the company my riding weight w/wo gear. Most companies require it when ordering an aftermarket shock or spring.

So I'm passing on some information I recently learned in regards to spring rates based on riding weights. This is not a suspension setup thread. Just information to know when ordering or at least understand what the numbers stamped the spring mean. A setup suspension thread has already been done by DanQ, so if you are looking for suspension setup 101, here is the link for that : http://www.r1-forum.com/forums/showthread.php?t=252234


This information was gathered from some folks on this site like motogp, hardracing, and ohlins.

Below, are a couple of charts that are model specific. if you look carefully you'll see that the spring rates for different models don't differ. At least for models YA638/788 according to the Ohlins spring rate chart. There is a margin of 25 pounds between each spring for each weight given. Follow the mini charts below and you'll be able to use the larger chart to determine what spring rate is recommended for your weight.

Determining what these numbers mean on ohlins shock (21040-31/95 L496)
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When looking at your spring you'll notice a set of numbers, example (21040-31/95 L496). The first few number determine the length on the shock (21040) normally 160mm is standard, and the next few number relate to weight ratio for riders(-31/95). Ohlins uses its own numbers. which is where things can get confusing figuring it out. Only concern yourself with the second number /95 in this case. The last set of numbers (L496) relates to the lot number. Below, the chart has it broken down into weight, and total recommended weight capacity for your bike and rider.

P.N. ____ Spring # ______ Rider Weight
YA 638 21040-31/95 ..... 150 - 175
YA 638 21040-34/100 ... 175 - 200
YA 638 21040-36/105 ... 200 - 225
YA 638 21040-39/110 ... 225 - 250

YA 788 21040-31/95 ..... 150 - 175
YA 788 21040-34/100 ... 175 - 200
YA 788 21040-36/105 ... 200 - 225
YA 788 21040-39/110 ... 225 - 250
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If you bought your shock New or used. Hopefully you'll now be informed with good information to understand what's right for your weight, when looking at an Ohlins shock.

Art. nr. Rate
N/mm Kg/mm ibs/inch

-88 28 2.85 160
30 3.06 171
-90 32 3.26 183
-01 34 3.46 194
-02 36 3.67 206
-03 38 3.87 217
-04 40 4.08 228
-05 42 4.28 240
-06 44 4.48 251
-07 46 4.69 263
-08 48 4.89 274
-09 50 5.10 286
-10 52 5.30 297
-11 54 5.50 308
-12 56 5.71 320
-13 58 5.91 331
-14 60 6.11 343
-15 62 6.32 354
-16 64 6.52 365
-17 66 6.73 377
-18 68 6.93 388
-19 70 7.13 400
-21 75 7.64 428
-24 80 8.15 457
-26 85 8.66 485
-29 90 9.17 514
-31 95 9.68 542
-34 100 10.19 571
-36 105 10.70 600
-39 110 11.21 628
-41 115 11.72 657
-44 120 12.23 685
-49 130 13.25 742
-54 140 14.27 799
-59 150 15.29 857
-64 160 16.30 914
-69 170 17.32 971
-74 180 18.34 1028
-79 190 19.36 1085
-84 200 20.38 1142
-89 210 21.40 1199
 

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Spec Chart

I have found this comprehensive chart in diagram for easier use
 

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The top numbers represent the build/year of shock.

The numbers on the right are cool for correlating lb/in versus nm vs kg/mm rating on springs.

Honestly the reat of the references Ill have to ask Dan about, I do want to know
 

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My R1 is MY ROAD DAWG 4 LIFE
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Discussion Starter #7
The top numbers represent the build/year of fork.

The numbers on the right are cool for correlating lb/in versus nm vs kg/mm rating on springs.

Honestly the reat of the references Ill have to ask Dan about, I do want to know
When you find out, can you let us know? Anything that can help everyone recognize spring rate vs weight ratio will greatly improve everyone knowledge on the subject. I've figured, and learn quite a bit, but I'm always looking to learn more. Thanks for adding the chart.
 

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I like having the chart because it is specific to Ohlins

These scales are helpful as well

145 lbs to 160 lbs 9.0/9.0 Nmm
150 lbs to 175 lbs 9.0/9.5 Nmm
175 lbs to 195 lbs 9.5/9.5 Nmm
185 lbs to 200 lbs 9.5/10.0 Nmm
195 lbs to 220 lbs 10.0/10.0 Nmm
210 lbs to 235 lbs 10.0/10.5 Nmm
230 lbs to 255 lbs 10.5/10.5 Nmm
245 lbs to 270 lbs 10.5/11.0 Nmm
above 260 lbs 11.0/11.0 Nmm

kg/mm to lbs/in conversions
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16 = 896
15 = 840
14 = 784
13 = 728
12 = 672
11 = 616
10 = 560
9.0 = 504
8.5 = 476
8.0 = 448
7.5 = 420
7.0 = 392
6.5 = 364
6.0 = 336
5.5 = 308
5.0 = 280
4.5 = 252
4.0 = 224
3.0 = 168
2.0 = 112
 

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My R1 is MY ROAD DAWG 4 LIFE
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Discussion Starter #9
My sentiments exactly, that's why I posted the info. So those looking for ohlins specific spring rate info could find it here. I tried and hoped I was able to break it down so that everyone could understand what I was getting at. So anything added to this thread is a plus in my book. Thank again
 

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So do I go with your specs or decarp's?

I have a 10.0 spring and I weight 177 without gear

I don't have the shock installed yet to check sag, etc

Bought the shock used

Thanks


I like having the chart because it is specific to Ohlins

These scales are helpful as well

145 lbs to 160 lbs 9.0/9.0 Nmm
150 lbs to 175 lbs 9.0/9.5 Nmm
175 lbs to 195 lbs 9.5/9.5 Nmm
185 lbs to 200 lbs 9.5/10.0 Nmm
195 lbs to 220 lbs 10.0/10.0 Nmm
210 lbs to 235 lbs 10.0/10.5 Nmm
230 lbs to 255 lbs 10.5/10.5 Nmm
245 lbs to 270 lbs 10.5/11.0 Nmm
above 260 lbs 11.0/11.0 Nmm

kg/mm to lbs/in conversions
-----------------------------
16 = 896
15 = 840
14 = 784
13 = 728
12 = 672
11 = 616
10 = 560
9.0 = 504
8.5 = 476
8.0 = 448
7.5 = 420
7.0 = 392
6.5 = 364
6.0 = 336
5.5 = 308
5.0 = 280
4.5 = 252
4.0 = 224
3.0 = 168
2.0 = 112
 

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Both of our info is correct. I just tried to find ones that were easier to discern.

Youre slightly over sprung... I have a 9.5 Ohlins chrome silicon spring that I could sell. I just need to install my new spring. PM me if you like:)

The spring Ill have off the bike in the next couple weeks..
 

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My R1 is MY ROAD DAWG 4 LIFE
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Discussion Starter #12
Xdonniedarkox is correct, You are over sprung but that is not as bad as being under sprung, try decreasing your preload and see if that helps before doing anything else as well. Kyle from graves set up my shock that was one up from the correct spring rate and I'm loving it...
 

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I contacted dan kyle and he told me I am probably UNDER sprung. I might need the next higher rate.

I'm going to install/set sag and ride it before making any changes. thanks for posting the info, guys.
 
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