Popular Bike Shops
Join the Cycling Forums on Strava
Australian Cycling Forums on Strava
Latest Reviews and Articles
Will your next bike be Intelligent? ABS and Smart Bike Tech
Vitus Vitesse EVO Disc Review – Speed Machine indeed!
- Posts: 664
- Joined: Fri Oct 20, 2006 6:03 pm
- Location: Sydney - City
- Posts: 7334
- Joined: Sun Jul 16, 2006 10:51 am
- Location: southern end of Adelaide - home of hills, fixies and drop bears
'Low gear' gives the shortest distance travelled for one turn of a crank.
This also equates to effort - a high gear is harder to push than a low gear.
The reason big cogs give you low gears on the rear but high gears on the front is that front and rear are doing different jobs.
On the front, the chainring, the cog is pulling the chain - the larger the cog, the more chain it will pull with one turn of the crank.
On the rear, the freewheel, the cog is being turned BY the chain - the smaller the cog, the more revolutions will be generated by the same length of chain.
Hence, a large chainring will pull a lot of chain through which will turn a small freewheel a lot of times, thus giving you a higher gear.
- Posts: 2880
- Joined: Fri Jun 30, 2006 11:43 pm
- Location: Katoomba, NSW
The most common way to express a final ratio is in "gear inches", which is the equivalent wheel size you'd need to produce that ratio if the cranks were turning the wheel directly.
You can work this out easily, by counting teeth on the front and rear, dividing the two to get a drive ratio, and multiplying by the wheel size.
e.g, really high gear on 26" wheels:
52t front 11t rear, 52/11 = 4.7, 4.7 x 26" = 123 gear inches.
low MTB gear:
24t front 34t back, 24/34 = 0.7, 0.7 * 26" = 18.3 gear inches.
Big number of gear inches is a high gear. Small is low gear. See, easy.
- General Australian Cycling Topics
- Info / announcements
- Buying a bike / parts
- General Cycling Discussion
- The Bike Shed
- Cycling Health
- Cycling Safety and Advocacy
- Women's Cycling
- Bike & Gear Reviews
- Cycling Trade
- Stolen Bikes
- Bicycle FAQs
- Serious Biking
- Audax / Randonneuring
- Retro biking
- Fixed Gear/ Single Speed
- Electric Bicycles
- Dragsters / Lowriders / Cruisers
- Children's Bikes
- Road Racing
- Road Biking
- Time Trial
- International and National Tours and Events
- Cycle Touring
- Touring Australia
- Touring Overseas
- Touring Bikes and Equipment
- Western Australia
- New South Wales
- South Australia
- Northern Territory
- Country & Regional
- The Market Place
- Member to Member Bike and Gear Sales
- Want to Buy, Group Buy, Swap
- My Bikes or Gear Elsewhere
- Cycling Brands
- Malvern Star
- Custom Builders
- Generic Carbon
Who is online
Users browsing this forum: Google [Bot]
About the Australian Cycling Forums
The largest cycling discussion forum in Australia for all things bike; from new riders to seasoned bike nuts, the Australian Cycling Forums are a welcoming community where you can ask questions and talk about the type of bikes and cycling topics you like.