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  2. Is this the New Shimano 105 12-Speed Mechanical Group? - AOL

    www.aol.com/lifestyle/shimano-105-12-speed...

    Although not announced by Shimano, the existence of a new 12-speed mechanical variant of the popular 105 road group was spotted in published 2024 bike info. ... 700 include the CM-M7100 12 chain ...

  3. Comparison of hub gears - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_hub_gears

    Shimano Nexus Inter-8: 8 307% 5th gear 1550-2040 g City Shimano Nexus Inter-7: 1995 7 244% 1465-1860 g City Shimano Nexus Inter-5E 2019 5 263% 60 Nm 1st gear 1650 g e-bike Shimano Nexus 4 Speed 4 184% 1st gear City Shimano Nexus Inter-3: 3 187% 2nd gear 1220 g City SRAM Spectro E12 (Elan) 1995 1999 12 339% 3500-4000 g City SRAM i-Motion 9: 2005 ...

  4. Bicycle chain - Wikipedia

    en.wikipedia.org/wiki/Bicycle_chain

    Depending on use and cleaning, a chain can last only 1,000 kilometres (600 miles) (e.g. in cross-country use, or all-weather use), 3,000 to 5,000 km (2,000 to 3,000 mi) for well-maintained derailleur chains, or more than 6,000 kilometres (4,000 mi) for perfectly groomed high-quality chains, single-gear, or hub-gear chains with a full cover ...

  5. Bicycle gearing - Wikipedia

    en.wikipedia.org/wiki/Bicycle_gearing

    A single-speed bicycle is a type of bicycle with a single gear ratio and a freewheel mechanism. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. Adult single-speed bicycles typically have a gear ratio of between 55 and 75 gear inches, depending on the rider and the anticipated ...

  6. Shimano Launches 12-Speed GRX Di2...and its 2x Only

    www.aol.com/lifestyle/shimano-launches-12-speed...

    Deputy Editor Tara Seplavy reviews the latest Shimano GRX Di2 12-speed components—it’s only 2x, which will disappoint many 1x drivetrain-loving gravel riders.

  7. Derailleur - Wikipedia

    en.wikipedia.org/wiki/Derailleur

    The Shimano FFS (Front Freewheel System) circa 1980 was the most widespread such system. Chain-drive systems such as the derailleur systems work best if the chain is aligned with the sprocket plane, especially avoiding the biggest drive sprocket running with the biggest driven sprocket (or the smallest with the smallest).

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