Original sentence: The bikes were also somewhat less efficient than regular bicycles — there was roughly an 8 percent in the gearing, in part due to limited manufacturing technology at the time (although the efficiency loss was not huge — Major Taylor won several races on a shaft drive bicycle)
Edited sentence: Company sold a three-speed shaft-driven bicycle in which the shifting was implemented with three sets of bevel gears.In 1902, The Hill-Climber Bicycle Mfg.The bikes were also somewhat less efficient than regular bicycles — there was roughly an 8 percent loss in the gearing, in part due to limited manufacturing technology at the time (although the efficiency loss was not huge — Major Taylor won several races on a shaft drive bicycle)