![]() Winner(s): 2X and 3X Weight The 2021 Kona Sutra uses a Shimano Deore 3X10 drivetrain. In the above example of bikes with common drivetrains, the 1X bikes top out at 47 to 48KPH in their highest gear, while a 2X or 3X bike will offer 15-20% more speed, topping out at 56 to 57KPH. It was not that long ago when 1X drivetrains were limited to 420%, but these days, there is much less of a difference in gear range between all drivetrains.Ī great way to visualise gear range is to peg the lowest gear at a set speed for all drivetrains and then calculate what the top speed will be. Your bike’s gear range, which is measured as a percentage, determines the speeds at which you can pedal your bike. Comparatively, my cadence will slow by 11RPM using a 2X11 or 3X10 drivetrain, allowing me to stay between 80 and 90RPM for longer. A crossover in the graph signifies smaller cadence differences than those selected, while any gaps in the graph result in bigger cadence differences.Īt my typical cadence, an upshift on a 1X12 drivetrain will slow my cadence by 13RPM. These graphs show the specific range of speeds for each gear between two selected RPMs. A 2X10 and 1X12 drivetrain showing average cadence differences of 13RPM. A 3X10 and 2X11 drivetrain showing average cadence differences of 11RPM. You’ll notice there isn’t a huge difference between 11-36t and 11-42t cassettes because the latter offers an extra gear to account for the 42t cog.īut gear steps are pretty abstract, so I prefer to graph them using cadence differences. Most cassettes used for touring and bikepacking have 13 to 15% gear steps. We can do this by minimising the gear steps between each cog on a cassette.Īverage percentage steps between cassette cogs: The next best thing is to make the difference between gear changes as small as possible, so you can stay in your optimal RPM range for longer. In an ideal world, our cadence would remain constant as we increase in speed, but this is not possible on a bike with gears. My preference is to pedal along at somewhere between 80 and 90RPM. And just like your car engine, you will have an ideal RPM range where you can pedal efficiently. That said, there is also data available suggesting that SRAM chains run slower than Shimano chains, so the drive efficiency number might be a touch less – perhaps as little as 0.7% between drivetrains, on average.Ĭadence is the number of times your cranks spin per minute when you ride. The result is about 1% less drivetrain efficiency on average, but it’s 1.5 to 2.5% less in the three highest gears. ![]() But additionally, when you use the smaller chainrings and cogs found on a 1X system, the chain tension is higher, the chain speed (or tooth-interactions-per-minute) is faster, and a chain has to articulate more to wrap around smaller cogs. The main reason for the higher resistance is greater chain angles from the chainring to the cassette, which results in the chainplates scraping harder on the cogs. VeloNews has lab tested the resistance of both 1X and 2X drivetrains, and the conclusion is clear: 2X is the most efficient across all gears (96.2% vs 95.1% drive efficiency). We will be looking at all data available across nine different categories to find out once and for all, which drivetrain is best. Today, we are going to analyse every aspect of bicycle drivetrains. So, are 1X drivetrains now the ultimate drive system, or is there still a place for 2X and 3X? ![]() According to my Bikepacking Bike Buyer’s Guide, it’s two-thirds of all 27.5″ gravel bikes, and close to 100% of mountain bikes. I remember Nino Schurter winning on it within weeks of it being shown to the public, which was an early sign that 1X was going to pave the way for drivetrains to come.įast forward to 2020 and 1X drivetrains feature on a large percentage of bikes. Eight years ago, SRAM released the first 1X-specific bicycle drivetrain.
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