- Mar 17, 2006
- 2,216
- 13
Fixed gear bikes have a greater mechanical advantage. Similar to the difference in wheel horse power between a vehicle equipped with a manual transmission asopposed to an automatic transmission, fixed gear has fewer moving parts, and thus less power robbing friction. There is just the front crank, the rear gear,and the chain. You get more pure power from each pedal stroke. In a standard 30 speed road bike, sure, you have a larger variety of gears, but you also have alot more moving parts. The chain runs through derailleurs, and there are at least 2 extra chain rings that do absolutely nothing for delivering power, theyhelp to guide the chain. The more contact the chain has with moving parts as it travels to turn the gears, the less power it delivers. If you look at the rearcassette and rear derailleur, you can see two small gears. Those rob power. In the exact same gear ratio, a fixed gear will be easier to power than a roadbike. In this drive train, it's simple and efficient.
There is such a thing as a free-coasting rear hub, so you have themechanical advantage of the single speed system, and the comfort of coasting from time to time. Doesn't need to be fixed gear. And as for hills, themechanical advantage is huge. It's easier to power through a higher gear ratio, thus easier to power up hill. Fixed gears usually climb hills easier than30 speed road bikes.