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| Manufacturer part # | IRDR8150A | IRDR8150E | IRDR8150F |
|---|---|---|---|
| Cage | Long cage | Long cage | Long cage |
| Speed | 12 | 12 | 12 |
| Largest cog | 34t | 34t | 34t |
| Weight | 262g | 262g | 262g |