Spring rate conversion chart

[nzspokes]

Found this online and thought I would share.

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"

[Robert Taylor]

The first four digit number is the series and denotes the free length and i.d as you correctly say, the second two digits an internal part number and the third digit series the rate.

Note that the industry tolerance on spring length is plus or minus 3mm

Many Ohlins springs for road bikes are indeed 57mm i.d but there are also just as many of different internal diameters for different applications. Many late model Ohlins MX springs are a bigger internal diameter midriff.

Many Ohlins springs will fit on oem shocks of other brands and often do a better job of it than Race Tech.

We can test the rate of both shock springs and fork springs with our digital testing gear.