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Originally Posted by Jnadke
I find that hard to imagine. EDPM rubber has a coefficient of friction of 3 on most surfaces, including Steel (not unlike that of the ramp). Then again, nobody can tell which is best because neither of us have tested them both.
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My design class this semester is designing a friction tester specifically for 4" to 10" diameter wheels. If we get a design which is worth a crap, we'll build it and would gladly prepare a database of wheel coefficient of friction for a variety of tire materials and surface materials.
Even if the class designs are worthless, this is an important enough topic that I will probably put together a design over Xmas break.
If there is sufficient interest, we'll be glad to post both the design drawings and the data on CD for all to share. Also, if anyone wants to supply a wheel for testing and is willing to share the data with the rest of the community, we will be glad to do the tests.