I have a question about wheel size. If you have two robots, one with 2inch wheels and one with 3 inch wheels, and they are build exactly the same besides the wheel size which one will be able to achieve a faster possible speed? Also, which one will be able to produce more torque or will they both be the same? My guess it that the one with larger wheels will go faster and the one with smaller wheels will have more torque but I would like to double check.
It wasn't for a school assignment (i'm not that lame). I'm building a sumo bot using Arduino and I'm trying to chose the best wheels. Assuming that the same motor was used would the smaller wheels have more torque to push the other robots.
To answer your OP: force will be higher but speed lower. Something to keep in mind when designing a battle bot - do you want speed for agility, or a slower bot with a bit more grunt?
A larger tire will require more torque output from the motor, this will cause the motor to slow down for a given voltage which in turn increases power consumption by said motor.
How much the motor slows down will determine wether the bot will move faster or slower for a given wheel size.
EDIT:
In other words you can oversize a tire when trying to get more speed out of a bot and actually slow down the bot
Speed = diametertirepiangular_velocitytire
If angular_velocity decreases more than the diameter increases then speed will decrease, the other way around speed increases