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Oil Viscosity

This table is sorted by real viscosity (centiStokes), not by nominal weight. It is maintained by Matthew Patton of 'Forks-by-Matt' and is merged from a variety of references. It is the only one (AFAIK) that is actually maintained with values cross-checked against manufacturer data-sheets where available.

Last edited: 5/5/2018

References:

  • Calculate API gravity
  • http://www.peterverdone.com/archive/images/content/motorcycle/PVD-ISO-Viscosity-Data.gif
  • http://peterverdone.com/archive/files/suspension oils.pdf
  • https://transmoto.com.au/comparative-oil-weights-table/
  • http://mahonkin.com/~milktree/motorcycle/fork-oil.html
  • https://www.motorex.com/en-us/moto-line/
  • https://store.belray.com/suspension-fluids/
  • https://www.ohlins-rooske.nl/docs/oil.pdf

Brand / weight / model nominal weight Reported cSt @40C (centiStokes) Reported cSt @100C (centiStokes) Reported Viscosity Index (VI) Recaclulated Viscosity Index (VI) Viscosity/ Temperature Coefficient (VTC) VT (cSt@40/cSt@100) Specific Gravity @15C
Red Line (LikeWater, Clear) 0 5.40 2.30 365 343 0.58 2.39
Ohlins Fork #2(01302-02) 7
Spectro Platinum SX400 2.5 9.2 0.867
Red Line (ExtraLight, Blue) 2.5 8.60 4.00 507 403 0.59 2.45
Bel-Ray Fork (99290) 2.5 9.1 0.87
Golden Spectro Shock (ultra light) 2.5 10.40 4.40 385 440 0.58 2.36
RockShox (Light cartridge, ??) 2.5 10.75 4.00 325 340 0.63 2.69
Bel-Ray HVI Shock 3 11.00 3.85 296 297 0.65 2.86 0.88
Ohlins Shock (01304-01)? 11
Kayaba (K2-S) 11.30 4.00 310 310 0.65 2.83
Showa Suspension SS-25 2.5 12.50 3.90 239 239 0.69 3.21
Silkolene Pro RSF 2.5 13.60 5.83 464 465 0.57 2.33
Ohlins Shock 309 (01306-01) 2.5 13.7
Maxima Racing Shock (light) 3 14.00 5.20 378 370 0.63 2.69
Torco RSF Light (purple) 14.50 4.70 288 286 0.68 3.09
Motorex racing fork 2.5 14.50 4.50 0.88
PJ1 Cartridge Pro Fork 3.5 14.60 3.60 134 0.75 4.06
Castrol Fork 5 15.00 3.74 150 179 0.73 3.75 0.836
Motul Fork, Factory Line (Very Light) 2.5 15.00 3.50 112 95 0.78 4.57 0.834
Ohlins #2.5 (1311-01, old #4) 2.5 15.00
Motorex Racing Fork (RaceTech US1) 2.5 15.10 4.20 201 226 0.71 3.45
Penske Shock (light) 15.50 6.30 434 434 0.59 2.46
Kayaba/Yamaha 01 Fork (zero-One) 15.60 3.45 150 96 0.78 4.52
Showa Suspension (SS-05) 15.65 3.60 116 113 0.77 4.36
Bel-Ray Fork 5 15.8 4.10 146 147 0.76 4.17 0.871
Maxima Bicycle Fork 5 15.90 3.51 150 98 0.78 5.53
Maxima Fork 5 15.90 3.51 150 98 0.78 4.53
Amsoil Shock Therapy (light) 5 15.90 4.4 209
Red Line (Light, Yellow) 5 16.0 7.30 512 409 0.61 2.59
Torco RFF 5 16 5.05 285 280 0.69 3.17 0.891
Motul Shock, Factory Line (V1400) 2.5 16.30 6.20 400 403 0.61 2.60 0.834
Maxima Racing Fork (85/150) 5 16.20 4.41 202 98 0.78 4.53 0.861
Golden Spectro Cartridge Fork (85/150, Race Tech RSF05) 5 16.20 3.5 150 119 0.77 4.42
Showa Suspension (SS-07) 5 16.44 3.76 135 119 0.77 4.37
Ohlins #5 (01305-01) 5 16.5 0.28
Honda Pro HP Fork 5 17.00 3.80 140 115 0.78 4.47
Pro-Circuit PC 17.00 4.10 149 0.76 4.15
Kayaba G5 5 17.70 3.50 72 72 0.80 5.06
Motul Fork, Expert (Light) 5 17.9 3.9 112 0.852
ELF Moto Fork SYN 2.5 18.00 4.00 121 122 0.78 4.50
Motul Fork, Comfort 5 18.20 4.00 124 119 0.78 4.55
Motul Fork, Factory Line (Light) 5 18.0 4.0 121 138 0.77 4.36 0.834
Agip Fork 2.5 18.50 4.37 152 153 0.76 4.23
Ohlins R&T43 (01309-01) 7 19.0
Bardahl (52 Fork) 19.30 5.10 212 212 0.74 3.78
Torco RFF 7 19.98 5.70 257 3.50 0.90
Ohlins Fork (1311-01 new #5) 7 20.04
Bel-Ray HVI Shock 5 20.70 6.67 345 345 0.66 2.93
Maxima Racing Shock (Medium) 7 21.00 7.30 349 358 0.65 2.88
Spectro Fork 5 21.60 4.40 119 114 0.80 4.91
Agip Fork 5 22.00 5.20 175 178 0.76 4.23
Ohlins #10 (01310-01) 22.00 0.37
Repsol Fork 5 22.00 4.9 150 xxx xxx 4.49
Shell Advance Fork 7.5 22 4.9 153 3.51
Silkolene Fork 5 22.30 4.40 106 107 0.80 5.07
Motorex Racing Fork 5 22.6 5.60 205
Ohlins Fork (old #5, 01313-01) 7 23
Elf Moto Fork SYN 5 23.30 4.80 130 129 0.79 4.85
Motul Fork, Factory Line (Light Medium) 7.5 24.0 4.9 131 0.835
PJ1 Fork Tuner 26.10 (20.5@100F) 4.90 111 0.81 5.33
Golden Spectro Cartridge Fork (125/150) 7.5 26.10 4.5 150 135 0.80 4.97
Golden Spectro Shock (Very Light) 5 26.40 9.90 400 397 0.63 2.67
Maxima Racing Fork (125/150) 7 26.70 5.36 151 138 0.80 4.98 0.861
Silkolene Pro RSF 5 26.70 9.46 372 372 0.65 2.82
PJ1 Fork Tuner 5 27.50 (21.7@100F) 5.10 113 0.81 5.39
Öhlins (Shock) 28.70 9.40 340 340 0.67 3.05
Bel-Ray Fork 7 29.00 5.20 110 108 0.82 5.58
Maxima Racing Shock (Heavy) 10 29.00 9.40 334 336 0.68 3.09
Öhlins (old #15) 30.25 10.18 352 352 0.66 2.97
Red Line (Medium, Red) 10 30.40 10.80 369 374 0.64 2.81
Agip Fork 7.5 31.00 6.40 163 165 0.79 4.84
PJ1 Fork Tuner 7.5 31.20 (28.5@100F) 5.40 106 0.83 5.78
Torco RSF (Medium) 31.82 9.57 300 309 0.70 3.32
Castrol Synthetic Fork 10 32.00 6.40 151 149 0.80 4.91
Maxima Bicycle Fork 10 32.00 6.28 151 151 0.80 5.10
Maxima Fork 10 32.00 6.28 151 151 0.80 5.10
Torco RFF 10 32.20 8.40 247 3.83 0.91
Spectro Fork 10 32.80 5.60 111 107 0.83 5.86
Motorex Fork (RT Med/US2) 10 32.90 7.20 200 192 0.78 4.57
Bel-Ray Fork 10 33.00 5.90 123 123 0.82 5.59
Shell Advance Fork 5 15 3.8 153 3.95
Kayaba G10S 10 33.20 5.70 111 111 0.83 5.82
Bel-Ray HVI 10 33.50 10.00 306 308 0.70 3.35
PJ1 Fork Tuner 10 33.90 5.70 106 0.83 5.95
Red Line D4 ATF 34.00 7.50 198 197 0.78 4.53
Mobil 1 Synthetic ATF 34.00 7.60 199 202 0.78 4.47
Silkolene Fork 10 34.90 7.05 169 169 0.80 4.95
Ohlins #10 (01315-01) 10 34.90 7.05 169 169 0.80 4.95
Motul Fork Comfort (Medium) 7.5 35.30 6.00 115 114 0.83 5.88
Honda Pro HP Fork 10 35.2
Bardahl 10 35.50 6.90 158 158 0.81 5.14
Motorex Racing Fork 7.5 35.9 7.70 192
Motul Fork, Expert (Medium) 10 35.9 6.0 112 0.862
Motul Fork, Factory Line 10 36.0 6.4 130 0.835
Showa Suspension SS8 (Apollo) 10 36.47 7.24 200 167 0.80 5.04
Silkolene Pro RSF 7.5 37.00 12.00 322 339 0.68 3.08
Maxima Racing Fork (165/150) 10 37.40 7.72 182
Shell Advance Fork 10 32 6.4 153 0.81 5
Ohlins Fork (01314-01) 10 40.0
Torco RFF (RockShox extra heavy) 15 43.44 10.76 250 245 0.76 4.04 0.91
Agip Fork 10 45.00 8.30 164 162 0.82 5.42
Elf Moto Fork SYN 10 45.40 7.60 135 134 0.83 5.97
Spectro Fork 15 45.60 7.20 119 118 0.84 6.33
Castrol Synthetic Fork 15 46.00 8.20 150 147 0.82 5.60
Repsol Moto Horquillas Fork (10W20) 46.00 8.40 150 161 0.82 5.48
Maxima Bicycle Fork 15 46.00 8.48 154 163 0.82 5.42
Maxima Fork 15 46.00 8.48 154 163 0.82 5.42
Shell Advance Fork 15 46 8.2 154 5.61
Castrol Fork 15 46.50 8.30 150 155 0.82 5.60
ELF Moto Fork 10 47.00 8.30 153 153 0.82 5.66
Maxima Racing Fork (235/150) 15 47.10 8.49 151 163 0.82 5.42
Golden Spectro Fork 15 47.27 6.76 100 370 0.65 2.82
Kayaba G15S 15 47.30 7.20 112 112 0.85 6.57
Silkolene Pro RSF 10 47.36 13.69 303 303 0.71 3.46
Silkolene Fork 15 48.45 8.50 153 153 0.82 5.70
Bel-Ray HVI 15 49.00 13.90 297 298 0.72 3.53
Bel-Ray Fork 15 53.00 7.50 103 103 0.86 7.07
Red Line High Temp ATF 53.90 10.00 172 176 0.81 5.39
PJ1 Fork Tuner 15 55.30 (56@100F) 8.70 133 0.84 6.36
Motul Fork, Expert (Med/Heavy) 15 57.1 8.3 116 0.869
Motul Fork, Factory Line (Heavy, 15-20) 61.00 13.20 224 225 0.78 4.62
PJ1 Fork Tuner 20 61.70 (68@100F) 8.40 106 0.86 7.35
Spectro Fork 20 65.00 8.90 110 111 0.86 7.30
Maxima Bicycle Fork 20 65.00 12.90 201 204 0.80 5.04
Maxima Fork 20 65.60 12.90 201 202 0.80 5.09
Red Line (Heavy) 66.80 16.00 256 256 0.76 4.18
Shell Advance Fork 15 67.00 10.37 120 143 0.85 6.46
Silkolene Fork 20 67.70 8.75 101 101 0.87 7.74
Castrol Fork 20 68.00 11.20 150 159 0.84 6.07
Repsol Moto Horquillas Fork 15w30 68.00 11.20 150 159 0.84 6.07
Agip Fork 15 69.00 11.50 162 163 0.83 6.00
Elf Moto Fork 15 72.60 11.60 155 155 0.84 6.26
Bel-Ray Fork 20 73.50 9.50 106 107 0.87 7.74
Motul Fork , Comfort (Heavy, 15-20) 77.90 10.10 111 112 0.87 7.71
Motorex Semi-Bath fork 5W40 90.90 14.60 169 168 0.84 6.23
Silkolene Pro RSF 15 92.50 19.50 235 233 0.79 4.77
ELF Moto Fork 20 99.00 14.60 150 153 0.85 6.78
Agip Fork 20 104.00 15.03 155 151 0.86 6.92
Silkolene Fork 30 105.00 11.84 101 102 0.89 8.87
Bel-Ray Fork 30 105.00 12.00 104 104 0.89 8.75
Kayaba G30S 30 116.10 16.70 156 156 0.86 6.95
PJ1 Fork Tuner 30 116.90 (116@100F) 15.00 133 0.87 7.79
Golden Spectro 4 20w50 155.00 19.60 146 145 0.87 7.91
Torco RFF 20 133.96 15.50 128 8.64 0.894
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