Gearings and Ratios Flashcards
Driven sprockets are the __________ sprockets
Output
Drive sprockets are the __________ sprockets
Input
What are some advantages of having multiple gears?
climb steep hills
get heavy loads moving (such as cargo on the bike)
achieve higher road speeds
Starting from a stop, climbing hills & moving heavy loads requires more _______
torque
_______ driven sprockets offer more mechanical advantage (more torque)
larger
long lever arm = ________ torque but ________speed
HIGH torque
LOW speed
Where is the driven gear located?
The rear
Where is the drive gear located?
The front
Formulas (Don’t know if we will need to have these memorized or know how to use them but Roger included them in the unit prep_
Drive gear / Driven gear = 1 revolution of the pedals
circumference of wheel = π X diameter of wheel
when higher speeds are needed, ________ diameter _________ gears are used
smaller; driven
larger chainrings are __________ gears
Higher
designed to increase road speed
smaller front chainrings are ______ gears
lower
designed to increase torque
How does low/high gears vary between chainrings and rear sprockets?
chainrings diameters are opposite of rear sprockets because they are the input (drive), not the output (driven)
