To get lower gears on your 10 speed Shimano road bike, you can use a 9 speed mtb derailleur.
Cable pull, sprocket pitch, shift ratio
Shimano 10 speed road, 9 speed mtb shifter cable pull: 2.3mm
Shimano/SRAM 10 speed road cassette sprocket pitch: 3.95mm
Shimano 10 speed road, 9 speed mtb derailleur shift ratio: 1.7
Shimano 10 speed mtb derailleur shift ratio: 1.2 (not compatible)
9 speed mtb derailleurs
| Title | Groupset | High sprocket min | High sprocket max | Low sprocket min | Low sprocket max | Weight | Listings |
|---|---|---|---|---|---|---|---|
| SRAM X0 9 Speed Rear Derailleur | 199g |
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| Shimano XTR M960 Rear Derailleur RD-M960-SGS | XTR M960 | 11T | 34T |
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| Shimano Deore M590 Rear Derailleur RD-M592 | Deore M590 | 11T | 32T | 36T | 284g |
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| Shimano Deore M590 Rear Derailleur RD-M591 | Deore M590 | 11T | 28T | 34T |
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Large 10 speed cassettes
| Groupset series | Part number | High | Low Sort ascending | Cassette teeth | Weight | Listings |
|---|---|---|---|---|---|---|
| 11-51T | 11T | 51T | 11-13-15-18-23-28-33-39-45-51T | 641g |
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| 11-50T SLR2 UltraLight | 11T | 50T | 11-13-15-18-21-24-28-32-38-44-50T | 365g | ||
| 11-50T | 11T | 50T | 11-13-16-20-24-30-36-42-50T | 578g | ||
| 11-50T | 11T | 50T | 11-13-16-20-24-28-32-36-40-46T? | 587g |
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| 11-46T | 11T | 46T | 11-13-16-20-24-28-32-36-40-46T | 554g |
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| 11-46T SLR2 UltraLight Rainbow | 11T | 46T | 11-13-15-18-21-24-28-34-40-46T | 323g | ||
| 11-46T SLR2 | 11T | 46T | 11-13-15-18-21-24-28-34-40-46 | 323g | ||
| Deore M4100 | CS-M4100-10 11-46T | 11T | 46T | 11-13-15-18-21-24-28-32-37-46T |
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| 11-42T | 11T | 42T | 11-13-15-17-19-21-24-28-32-36-42T | 542g |
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| Deore M4100 | CS-M4100-10 11-42T | 11T | 42T | 11-13-15-18-21-24-28-32-37-42T | ||
| SLX M7000 | CS-HG81-10 bK | 11T | 36T | 11-13-15-17-19-21-24-28-32-36T | 369g |
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| 11-36T | 11T | 36T | 11-13-15-17-19-22-25-28-32-36T | 366g |
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| XTR M980 | CS-M980 bk 11-36T | 11T | 36T | 11-13-15-17-19-21-24-28-32-36 | 272g |
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| 12-36T | 12T | 36T | 12-13-15-17-19-22-25-28-32-36T |
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| Deore XT M770 | CS-M771-10 11-36T bk | 11T | 36T | 11-13-15-17-19-21-24-28-32-36T | 343g | |
| SLX M7000 | CS-HG81-10 bJ | 11T | 34T | 11-13-15-17-19-21-23-26-30-34T | 351g |
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| XTR M980 | CS-M980 bJ 11-34T | 11T | 34T | 11-13-15-17-19-21-23-26-30-34 | 255g |
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| Deore XT M770 | CS-M771-10 11-34T bJ | 11T | 34T | 11-13-15-17-19-21-23-26-30-34T | 232g | |
| 11-32T | 11T | 32T | 11-12-13-15-17-19-22-25-28-32T | 296g |
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| 12-32T | 12T | 32T | 12-13-14-15-17-19-22-25-28-32T |
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| Deore XT M770 | CS-M771-10 11-32T bL | 11T | 32T | 11-12-14-16-18-20-22-25-28-32T | 294g |
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| SLX M7000 | CS-HG81-10 bL | 11T | 32T | 11-12-14-16-18-20-22-25-28-32T | 317g |
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| Ultegra 6700 | CS-6700 12-30T | 12T | 30T | 12-13-14-15-17-19-21-24-27-30T | 238g |