| Up: Table of contents | Fractions | Improper Fractions | Decimal | Increments and Range | |||||||
| Decimal approximations of drive ratios of bicycle hub gears | |||||||||||
| Brand | Speeds | Model[1] | Shifter position | ||||||||
| -4 | -3 | -2 | -1 | (near) unity | +1 | +2 | +3 | +4 | |||
| Ratio | |||||||||||
| Bendix | 2-speeds | Red Band, Yellow Band | 0.682 | 1.000 | |||||||
| Blue Band | 1.000 | 1.467 | |||||||||
| 3-speeds | (See Sachs, SRAM) | 0.734 | 1.000 | 1.362 | |||||||
| Rohloff | Speedhub, 14-speed | Each value in this row is the one directly below it, times the third-stage ratio of 0.409 | 0.279 | 0.316 | 0.360 | 0.409 | 0.464 | 0.528 | 0.599 | ||
| For these ratios, the third stage is locked at unity. | 0.682 | 0.774 | 0.881 | 1.000 | 1.135 | 1.292 | 1.467 | ||||
| Sachs, SRAM | 2-speeds | Doppel-torpedo | 0.762 | 1.000 | |||||||
| Automatic, Duomatic, Automatix | 1.000 | 1.362 | |||||||||
| Orbit | 0.738 | 1.000 | |||||||||
| 3-speeds | 25,29 | 0.600 | 0.750 | 1.000 | |||||||
| Universal Dreigang | 0.800 | 1.000 | 1.250 | ||||||||
| 53 | 0.750 | 1.000 | 1.333 | ||||||||
| 55 | 0.750 | 1.000 | 1.333 | ||||||||
| All 3-speeds 1970-, 3 x 7, DualDrive | 0.734 | 1.000 | 1.362 | ||||||||
| 4-speed | Universal Torpedo | 0.600 | 0.750 | 1.000 | 1.333 | ||||||
| 5-speeds | Sachs H 5100, 5113, 5120, 5213 | 0.667 | 0.778 | 1.000 | 1.286 | 1.500 | |||||
| SRAM P5 5-speeds | 0.633 | 0.781 | 1.000 | 1.281 | 1.579 | ||||||
| 7-speeds | Sachs Torpedo H 7203, -13, -20 | 0.593 | 0.677 | 0.815 | 1.000 | 1.227 | 1.476 | 1.685 | |||
| Sachs Super 7, SRAM S7, MH7205, -15, -25 | 0.574 | 0.677 | 0.809 | 1.000 | 1.236 | 1.476 | 1.742 | ||||
| 8-speeds | SRAM G8 | 0.609 | 0.710 | 0.803 | 0.903 | 1.054 | 1.204 | 1.355 | 1.581 | ||
| 9-speeds | SRAM G9 | 0.541 | 0.609 | 0.710 | 0.803 | 0.903 | 1.054 | 1.204 | 1.355 | 1.581 | |
| SRAM I-Motion 9 | 0.542 | 0.621 | 0.727 | 0.853 | 1.000 | 1.172 | 1.375 | 1.611 | 1.845 | ||
| 12-speed | Sachs Elan 12-speed | Speeds 1 | 0.698 | 0.852 | 1.000 | 1.179 | 1.333 | 1.481 | |||
| through 6 | |||||||||||
| Speeds 7 | 1.614 | 1.768 | 1.917 | 2.061 | 2.215 | 2.363 | |||||
| through 12 | |||||||||||
| Shimano | 3-speeds | 333, SG-3S21, G-3S23, F, G, 3SC, 3CC | 0.750 | 1.000 | 1.333 | ||||||
| Nexus Inter 3 | 0.733 | 1.000 | 1.364 | ||||||||
| Nexus SG-3R75, pulley shifting | 0.632 | 0.741 | 1.000 | ||||||||
| 4-speed | Nexus Inter 4 | 1.000 | 1.244 | 1.500 | 1.843 | ||||||
| 5-speeds | Nexus Inter 5 | 0.750 | 1.001 | 1.159 | 1.335 | 1.545 | |||||
| 7-speeds | Nexus 7-speed | 0.632 | 0.741 | 0.843 | 0.989[2] | 1.145 | 1.335 | 1.545 | |||
| 8-speeds | Nexus, Alfine 8-speed | 0.527[3] | 0.644[4] | 0.748[5] | 0.851[6] | 1.000 | 1.223 | 1.419 | 1.615 | ||
| 11-speed | Alfine 11-speed | 0.527 | 0.681 | 0.770 | 0.878 | 0.995 | 1.134 | Ratios on the first line are 0.527 times the ones below them. | |||
| 1.292 | 1.462 | 1.667 | 1.888 | 2.153 | |||||||
| Sturmey-Archer (Also licensees and copies: Brampton, Hercules, NK, Schwinn-Approved, Sears, Styre, SunTour for the AW, BSA for the X.) | 2-speeds | S2 (1966) | 0.714 | 1.000 | |||||||
| S2, S2C, B2C (2010) | 1.000 | 1.380 | |||||||||
| T,TB,TBC,TBF,TBFC,TF | 0.750 | 1.000 | |||||||||
| TC close-ratio fixed/freewheel | 0.865 | 1.000 | |||||||||
| 3-speeds | Original 1902 | 0.800 | 1.000 | 1.250 | |||||||
| A, C, F, FN, FX, N, S, V, X, BSA | 0.762 | 1.000 | 1.313 | ||||||||
| AB, AB3, AG, AT, AT3, AW, AW3, AWC, C30, K, KB, KC, KT, KTC, QS-RC3, RD-RB3, RS-RF3, RS-RR3, RX-RD3, S30, S3B, S3C, SAB3, SBR, S-RB3, S-RC3, S-RF3, SX-RB3, SX-RK3, TCW, TS-RC3, TS-RF3, XL-RD3, X-RD3 | 0.750 | 1.000 | 1.333 | ||||||||
| AC | 0.923 | 1.000 | 1.067 | ||||||||
| ASC fixed | 0.750 | 0.900 | 1.000 | ||||||||
| AM, AM Tandem | 0.865 | 1.000 | 1.156 | ||||||||
| AR | 0.932 | 1.000 | 1.072 | ||||||||
| Brompton special BRW | 0.638 | 1.000 | 1.567 | ||||||||
| KS | 0.889 | 1.000 | 1.125 | ||||||||
| KSW | 0.857 | 1.000 | 1.167 | ||||||||
| S3X | 0.625 | 0.750 | 1.000 | ||||||||
| SW | 0.722 | 1.000 | 1.385 | ||||||||
| 4-speeds | FB, FG, FW | 0.667 | 0.789 | 1.000 | 1.267 | ||||||
| AF, FC | 0.750 | 0.900 | 1.000 | 1.091 | |||||||
| FM | 0.667 | 0.857 | 1.000 | 1.125 | |||||||
| 5-speeds | AB5, AT5, S5, S5/1, S5/2, S5C, 5-Speed Alloy, 5 Star, Sprinter 5, XRD5, XRF5 | 0.667 | 0.789 | 1.000 | 1.267 | 1.500 | |||||
| S50(W), S5C(W), S5S(W), S-RC5(W), S-RF5(W), XL-RD5(W), X-RC5(W), X-RD5(W), X-RF5(W) | 0.625 | 0.750 | 1.000 | 1.333 | 1.600 | ||||||
| 7-speeds | AT7, S7, S7C, Sprinter 7, X-RD7[7] | 0.600 | 0.690 | 0.804 | 1.000 | 1.243 | 1.450 | 1.667 | |||
| 8-speeds | X-RD8, X-RF8, X-RK8, X-RR8[8] | This hub only gears up. | Gears 1 through 4: | 1.000 | 1.281 | 1.450 | 1.644 | ||||
| Gears 5 through 8: | 1.858 | 2.106 | 2.384 | 3.054 | |||||||
| S80(W), X-RD8(W), X-RF8(W), X-RK8(W)[9] | This hub only gears up. | Gears 1 through 4: | 1.000 | 1.303 | 1.481 | 1.677 | |||||
| Gears 5 through 8: | 1.931 | 2.186 | 2.485 | 3.239 | |||||||