19/01/2024
Gearing Choices: Should You Run Larger or Smaller Chainrings/Cassettes?
One of the main sources of friction in a chain is the contact between the inner plates and the rollers. This friction losses occurs every time the chain links bend. The less amount a chain has to bend as it engages and disengages the pulley wheels, chain ring and cassette, the less friction is produced.
For example, a 53x11 and 48x10 gear are more or less the same ratio of 126 gear inches. While it’s the same gear, the 53x11 combination is 6w faster than its smaller 48x10 competitor.
Bending your chain around a 55t chain ring has less severe bends than a 48t chainring, this also means you might be in the 15t in the back instead of the 10 or 12, which means it`s bending less severe there as well. The big front chainrings also improves chainline, by allowing you to use a sprocket closer to the middle of their cassette. Now add a pulley wheel that is 19t instead of a standard 10t pulley wheel, there are again less severe bends.
If you’re looking to go faster for less energy it would be logical to have the absolute biggest chain rings and largest cassette options available to you. Less friction also means bigger chain rings/cassettes and pulleys tend to have longer lifespan.
You can also improve the lifespan of your bike’s drive train by using wax based chain lubricants. Independent tests eg. by zerofriction, have consistently shown wax-based lubricants to be among the most efficient and that they also typically do a great job of resisting wear-increasing contaminants.
Ceramic Speedwax L**e Ceramic Speedwax L**e is a specifically formulated and good value wax based chain l**e, available at selected bike shops:
Upperhill: The Bicycle Garage (10 Masaba Road) - 0702 709729
The Bike Village (Bunyala Road) - 0721 549655
Mombasa: Memon Sports Shop (Koinange Rd)- 0 797 005903
Langata: TopTeam Cycles & Fitness – 0706994999
Ruiru: Bike it or Hike it (The Nest Business Park) - 0738 196843
Umoja: Race Pace Bicycles (Kangudo Road) 0727209636
Baiskeli_Centre (Kipande Road}, 0746 726202
Parklands: Urban Rock Cycles (Taarifa Road)
Pangani: Memon Sports Shop, (Northview road) 0713358228
What size cogs does it take to be successful in the Tour de France? We take a closer look at the gearing choices of the pros