For reference Standard firestorm spring rate is 16.4kg/mm or 916lbs/in, according to the racetec site. Link below is the ohlins spring chart, helpful to id the ohlins numbers, the top blue line numbers equal the spring length, the side blue numbers are the spring rates marked next to them. Just put a ttx on my 300xc, went with spring on the Ohlins chart for my wt 180 lb with gear. Spring 6.6, free sag 35mm, ride sag, 115mm. Same numbers as the stock shock, so should be close. Make sure you start with the recommended pre load first before you mount it up. Crack for srs audio sandbox serial key. The correct spring rate, specified for the rider’s weight, and customized valving tuned for application and skill level is required for a proper setup on the KTM 125 SX and 150 SX. Correct spring rates and Race Tech Gold Valves will increase bottoming resistance and plushness over braking bumps, as well as square edged chop. We guarantee it!
- I have enclosed Ohlins PDF files for: DU511 OEM 1098S Rear shock DU515 Track 3 way Rear shock DU788 TTX36 Rear shock FG511 OEM forks Ohlins 1098S/1198S FGRT803 Forks FGK138 25 MM cart kit Spec chart 848/1098 Base/1198 Base FGK138 Installation manual Ohlins spring chart Below.
- . all spring ratings are lbs./in. Spring rate setup chart #6063-03, #6063-04 (p) primary 17mm front springs (s) secondary 42mm front springs super soft (option 1) super soft (option 1) soft (stock) optimum soft dual rate optimum medium dual rate optimum firm dual.
this might be a good sticky!
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 at.
• 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.
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
Spring Length Chart
1093- 1091- 1092-
150 mm 160 mm 170 mm
5.9' 6.3' 6.7'
REAR SHOCK SPRINGS1091-34/100 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 at.
• 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.
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
Spring Length Chart
1093- 1091- 1092-
150 mm 160 mm 170 mm
5.9' 6.3' 6.7'
i came about this trying to find out about my shock, i thought i had been sold a WP shock that was for a rider 170-175 kg in weight as that was what was stamped on the spring 170-175, thankfully Al pointed out to me that i was incorrect in thinking it was kg rating it was infact the Newton Force rating of the spring, so to anyone that has a got a shock second hand and doesn't know what spring is on it this may be of some use?
http://racetech.com/ProductSearch/2/Hon .. /1997-2005
Recommended Shock Spring Rate (for me 14 stone): 17.3 kg/mm (use closest available)
You can get the Newton force by multiplying the Mass and the Acceleration. F = m.a,
So in this case the Acceleration is the Gravity which is 9.8 m/s. and the Mass is the Spring rate given
The answer is F = 17.3kg X 9.8m/s = 169.54N
So ideal spring for me Solo would be 170N so very happy with the 170-175 spring,
To get a kg rate of a spring for a listed Newton force simply divide the Newton Force by Gravity
So
175N/mm / 9.8m/s = 17.8kg/mm
170N/mm / 9.8m/s = 17.3kg/mm
So what is a Spring Rate??? A Spring rate is the number of kg or Newton needed to move the spring by 1 mm (or inch if you use lb rating).
Here are some pre worked out spring rates for the rear shock for road use on a Firestorm
Ohlins Spring Rate Guide
To work out what spring rate suits what rider weight you have to then factor in the shock linkage ratio, the weight of the bike, the weight distribution of the bike and the type of riding. Then you add the rider weight (in full riding gear). These are results calculated by the Racetech site, i have added the N/mm and lb/in data using conversion ratesStock Rear Shock Spring Rate: 16.4 kg/mm = 160.8 N/mm = 918.3 lb/in
9 stones = 15.55 kg/mm = 152.3 N/mm = 870.7 lb/in
10 = 15.9 kg/mm = 155.8 N/mm = 890.3 lb/in
11 = 16.25 kg/mm = 159.2 N/mm = 909.9 lb/in
12 = 16.6 kg/mm = 162.8 N/mm = 929.5 lb/in
13 = 16.95 kg/mm = 166.1 N/mm = 949.1 lb/in
14 = 17.3 kg/mm = 169.5 N/mm = 968.7 lb/in
15 = 17.65 kg/mm = 172. 9N/mm = 988.3 lb/in
16 = 18 kg/mm = 176.4 N/mm = 1007.5 lb/in
17 = 18.35 kg/mm = 179.8 N/mm = 1027.5 lb/in
18 = 18.7 kg/mm = 183.2 N/mm = 1047.1 lb/in
19 = 19.05 kg/mm = 186.6 N/mm = 1066.7 lb/in
20 = 19.4 kg/mm = 190.1 N/mm = 1086.3 lb/in
FRONT FORK SPRINGS
(Standard Firestorm Forks)
Stock Fork Spring Rate: .585 kg/mm(stock) Very Soft and undersprung
9 Stone = 0.791 kg/mm = 7.75 N/mm = 44.29 lb/in
10 = 0.812 kg/mm = 7.96 N/mm = 45.46 lb/in
11 = 0.833 kg/mm = 8.16 N/mm = 46.64 lb/in
12 = 0.854 kg/mm = 8.37 N/mm = 47.82 lb/in
13 = 0.875 kg/mm = 8.58 N/mm = 48.99 lb/in
14 = 0.896 kg/mm = 8.78 N/mm = 50.17 lb/in
15 = 0.917 kg/mm = 8.99 N/mm = 51.34 lb/in
16 = 0.938 kg/mm = 9.19 N/mm = 52.52 lb/in
17 = 0.959 kg/mm = 9.40 N/mm = 53.70 lb/in
18 = 0.98 kg/mm = 9.61 N/mm = 54.87 lb/in
19 = 1.001 kg/mm = 9.81 N/mm = 56.05 lb/in
20 = 1.022 kg/mm = 10.02 N/mm = 57.22 lb/in
I will also work out the rates for CBR 929 / 954 forks fitted to a Storm and fill in shortly
Rider Weights (approx)