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Re: Plaction tread tears off in chunks
We had the same trouble last year with rubber conveyor belt treads on 4" AM performance wheels driven by 3 CIMs per side. That tread de-laminated frequently when we played defense -- i.e., when we pushed robots.
This year we have switched to blue nitrile as recommended above. No issues during our Week 1 event. However, this year we have spent more time scoring, so less time playing defense, so far. 
See our wheels in this picture.
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
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