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Re: pic: Why aren't omni wheels like this used?
From the picture, it looks like the frame actually sticks inside the large roller in order to support the end of the small one - in other words, the ends of the large rollers are completely hollow. Make the rollers out of a hard plastic, and I can't see them being easily replaceable should a roller break. Make them out of anything softer/more flexible to let them be easily replaceable, and I don't think they'll stand up to our uses.
The more traditional Omni wheels, on the other hand, do have replaceable rollers - we have 2 pairs of omni's from 2007 that are still running today, although we've replaced the rollers on them a couple of times (a very straightforward process).
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2007 - Present: Mentor, 2177 The Robettes
LRI: North Star 2012-2016; Lake Superior 2013-2014; MN State Tournament 2013-2014, 2016; Galileo 2016; Iowa 2017
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2016: Lake Superior WFFA
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