If you weren't able to notice our tether we had it always run along the back wall and then curled it up near our wheel.
We have 1/4 inch inside diameter rubberized pvc air hose ( one used for compressors) its about an inch outside diameter. It has proved to be the best option compared to anything else because we can drive over it easy since it compresses being rubber and can't make small coils in our wheel having pvc in it.
If anyone on our alliance ever drove over it they just had to spin their wheel backwards for half a second and it spit it back out.
I know 5254 later picked up something similar after seeing what we had I'm not sure what material.
this is a link to it on amazon
http://www.amazon.com/BOSTITCH-PRO-1...words=prozhoze
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2010-2013 Team 353 The POBots - Student, 2014-present Alumni.
2014- present Team 5030 The Second Mouse - Mentor and Founder.