I’ll wait on @Skyart. Unless someone else has a trampa. I can send the rubber
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Il bring em by monday!
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I could likely get away with just detailed pictures of the hubs and gummy.
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OK, I now have a good rendering of the Gummies and of course it has sent me off onto a different path
What are all your thoughts on this concept:
An indexable, modular urethane knobby tire that you can change the knob positions relative to each other to suit the riding surface from sand, gravel, dirt, wet, to chunder and smooth pavement, etc. Current design is 5 " in diameter and 3.75" wide.
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to fit what hubs?
I think it would be really hard to keep under control. Too many things to rub between each other to be able to keep tolerances on check after even 500km
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We will need to make the hubs
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We have our ways…
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How many pneumatics last 500 km?
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6x2’s do.
This is starting from 27 august
Had another 200km before, plus around 100 messing about with a underpowered battery.
Rear:
Front:
Downside to these tyres is they’re wobbly as fuck. Had to use 35g of balancing weights on one of them, other took only 5g
Also, they’re dirt cheap to replace. $3 a tube, $5 a tyre from where i buy, others found even cheaper.
They’re the china of tyres, but they work i guess
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Our’s will be perfectly balanced of course 
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The biggest issue with gummies is they can separate from the hub slightly at higher speeds. Are you thinking of incorporating some sort of lock or anti-stretching system into your hubs or urethane?
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As long as the hub accounts for the stem weight and the wheel pulley sistem will have exactly 0 play, even when mounted with no bearing, i can’t wait to try them out!
Seriously, i need a set of pneumatics that don’t do wheelbite on the hummie deck and have easily accesible (and affordable) metal pulleys.
Bergs are a close one but currently unobtanium, 6x2’s will have me top mount only and all other options mean dkp’s, which don’t really fit the 60km/hr side of things
My 155’s are at 400-500 miles 
I’m also light though so maybe I don’t apply to that…
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I would rather prefer smaller hubs and 5" pneumatics.
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One of the big issues at least domestically in the USA is making a small bead diameter tire. There are some in China but I do not want to go that route.
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Make ~5” thanes that lasts without chunking, has good grip for thanes, and doesn’t stretch off the hub at speed and I feel like you’ve got a market.
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What about developing inserts that could be glued to the inside of the hypa, superstar, MBS hubs etc… creating a locking profile that a revised “Riptide Gummies” could key into.
Maybe a herringbone profile (mirrored on either side of the hubs) to discourage lateral slip?
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5"x3" PU wheels and 5"x2" pneumatics are definitely a market gap which some are already trying to fill.
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