These shirts emphasize the option of using a bike (or, erm, a TaunTaun).
Cyclists shall inherit the earth. [Ban T-shirts]
Bike Love [The Giant Peach]
Conserve. [Your Conscience]
[on sleeve: Conserve]
Conserve fuel, ride a TaunTaun. [Star Wars Zazzle]
(Some shirts are available in unisex, men's, women's, juniors, plus sizes, and children's sizes. I only display one shirt as a representative of the style. Please see the websites for available size and style/color options.)