i just wanted to share my results of casting my own wheels. I was inspired by @visnu777. Next mold will be completly closed, since i wasn’t sure how it would turn out i kept it open to see how this stuff behaves. But i am amazed how easily it got into every corner, but it was probably also because i made sure there are no 90 degree angles in my design. Anyway here are the pictures. Still some flaws in it but ok.
Just used off the shelf Polyurethane from Kaupo, PMC Series, in this case 770. The stiffness is quite perfect. I could imagine using an airless style wheels for more cushy ride.
If you want to do some bad weather wheel sleeves i suggest you try some rubber next. You will have to experiment a bit i think, but rubber behaves much much better on wet surface than urethane.
Urethane looses grip almost completely on wet surface, rubber does not.
hahhaha yeah that would have been a best seller for some time. Except the bad quality of their thane the main problem is another one. The wheel sleeves on the r2 come off in summer time, when the roads are hot and the urethane gets a bit softer than usual. It expandsthe sleeve) bc of the heat of the motors and the road. Rotation does the rest of the job to kick the sleeve into the universe. Why is it that way?
If you take a closer look on r2 hubs you will see that the sleeves are just bolted in the can(rotor) with a few screws(4?), with an aluminium shield in order to hold the sleeves in place; a rounded sleeve on a rounded can(rotor)!
This is build to come off if you ask me, bc if its not heat deforming the urethane then its the spin of the motors at some point. Under perfect conditions spin and heat go hand in hand.
The solution is to always wedge the wheelsleeves first and to use much more screws to mount a solid shield on the motors, and this is not a point of budged, its knowledge…
…you may know this brand and video but they had the same problem, just at higher speed
edit: sorry for highjackin
yeah , but wheel sleeves dont last that long anyways, which is no problem imo because if its build right, a change is the easiest thing on earth.
Nextboard found another solution than wedging the sleeves.they found a way to connect the urethane to the core in a way it cannot get off and then just bolted the core sleeve with an alu core on the can.
Dont know, only thing i know he used rubber of some kind.
I saw you found @visnu777 thread. Maybe he has an idea what material is the right to start with.
Link this in the casting thread, we need more of this 
