Gear ratio information about different models of the A-bike
Posted: Fri Aug 27, 2010 7:09 pm
A-bike / A-bike Plus / 6" wheeled A-bike Smart
Dual Chain ratios: 14:8 and 35:9
Tyre Size: 15cm/6" diameter x 3.2cm/1"
Crank length: 140mm
Gear inches: 6" x 14 ÷ 8 × 35 ÷ 9 = 40.83"
Metres of development: 0.15m x π x 14 ÷ 8 × 35 ÷ 9 = 3.21m
This means that the bike travels about 3.21 metres per crank rotation.
Gain Ratio: 150mm ÷ 2 ÷ 140mm x 14 ÷ 8 × 35 ÷ 9 = 3.65
A-bike City / 8" wheeled A-bike Smart
Dual Chain ratios: 14:8 and 33:11
Tyre Size: 20cm/8" diameter x 3.2cm/1"
Crank length: 140mm
Gear inches: 8" x 14 ÷ 8 × 33 ÷ 11 = 42"
Metres of development: 0.2m x π x 14 ÷ 8 × 33 ÷ 11 = 3.30m
This means that the bike travels about 3.3 metres per crank rotation.
Gain ratio: 200mm ÷ 2 ÷ 140mm x 14 ÷ 8 × 33 ÷ 11 = 3.75
What is "gear inches"?
http://en.wikipedia.org/wiki/Gear_inches
What is "metres of development"?
http://en.wikipedia.org/wiki/Gear_inches#Calculating_metres_of_development
What is "gain ratio"?
http://www.sheldonbrown.com/gain.html
Information about measuring gears:
http://en.wikipedia.org/wiki/Bicycle_gearing#Measuring_gears
Gear ratios comparison among tiny wheeled folding bikes:
http://www.abikecentral.com/forum/viewtopic.php?f=2&t=1369
Dual Chain ratios: 14:8 and 35:9
Tyre Size: 15cm/6" diameter x 3.2cm/1"
Crank length: 140mm
Gear inches: 6" x 14 ÷ 8 × 35 ÷ 9 = 40.83"
Metres of development: 0.15m x π x 14 ÷ 8 × 35 ÷ 9 = 3.21m
This means that the bike travels about 3.21 metres per crank rotation.
Gain Ratio: 150mm ÷ 2 ÷ 140mm x 14 ÷ 8 × 35 ÷ 9 = 3.65
A-bike City / 8" wheeled A-bike Smart
Dual Chain ratios: 14:8 and 33:11
Tyre Size: 20cm/8" diameter x 3.2cm/1"
Crank length: 140mm
Gear inches: 8" x 14 ÷ 8 × 33 ÷ 11 = 42"
Metres of development: 0.2m x π x 14 ÷ 8 × 33 ÷ 11 = 3.30m
This means that the bike travels about 3.3 metres per crank rotation.
Gain ratio: 200mm ÷ 2 ÷ 140mm x 14 ÷ 8 × 33 ÷ 11 = 3.75
What is "gear inches"?
http://en.wikipedia.org/wiki/Gear_inches
What is "metres of development"?
http://en.wikipedia.org/wiki/Gear_inches#Calculating_metres_of_development
What is "gain ratio"?
http://www.sheldonbrown.com/gain.html
Information about measuring gears:
http://en.wikipedia.org/wiki/Bicycle_gearing#Measuring_gears
Gear ratios comparison among tiny wheeled folding bikes:
http://www.abikecentral.com/forum/viewtopic.php?f=2&t=1369