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=== Discussion ===
=== Discussion ===
During our development process, several issues arose that increased the complexity of our final design.
-The rear bicycle tire must have constant tension against the roller.  If the roller was not tight enough against the tire, the roller would burn rubber from the traction caused by slipping.  With the roller pressed hard into the tire, the friction was minimized and the powering revolutions of the roller were maximized.
-The custom designed gear system was hard to test because so many pieces were variable.  The BMX sprockets had to be custom fit to our roller and motor each time in order to test the appropriate gear ratio for the system. This was a difficult phase because each sprocket had to be welded to a custom-fit piece of steel in order to attach to the rods.
-The electrical circuit needed to be set-up in a way that the electrical components would not overheat. 
-The bicycle stand had limitations that we had not foreseen.  The stand works well for a range of tire diameters because it is widely adjustable at the roller base.  However, the width of the axle locks are limited to a small range of rear wheel axle diameters up to 8 ½ inches wide.  We did not anticipate the wide variety of styles on bicycles including modern quick release tire mounts and bulky accessory customizations like bag holders/baskets.


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== DIY ==
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