Sweet thanks for the info! I am trying to get access to my teams parts and robot… They are both in a chemistry closet right now 
We are going to test them soon though.
Anyone try these with a cut down version of the WCP colson hub? It looks like the OD of the hub might be a bit to small but I’m not sure.
We haven’t, but it should be super easy to make a hub. You turn down 1.375" or 1.5" stock a bit, bore, and then cutoff. Later you broach. Assuming you have a lathe and arbor press it is super easy to do.
Rather a large assumptions for the majority of FRC teams. We’ll probably be calling in a favor or two to get a few made for us before IRI.
Ah, good to know. At the Championship, we were trying to come up with a quick fix for an encoder disk (previous wheel had a piece of retro reflective tape on the hub) and discovered that the wheels are really tough to work with.
Having made hubs for both Colsons and these Urethane Wheels, I can say that the hubs are similar, but a hub made for a colson would be too small for the urethane wheel. If you really wanted to, you could sleeve the urethane wheel with a piece of 1.25" (nominal) tubing that’s somewhere around 1/32" wall and probably make something work, but at that point, it might be more prudent to just make hubs that are the correct OD.
I have a drawing somewhere of the hubs that we’re running in our urethane wheels, if you need it/it’ll help expedite getting them made in time for IRI, shoot me a PM.
We had no issue attaching a piece of adhesive backed retro reflective tape to the surface of this wheel. The main thing we needed to do was point the sensor towards the wheel at a 45 degree angle so that we wouldn’t get reflection off our aluminum hub.
That’s weird, we couldn’t get our retroreflective tape to stick to the urethane part(s) of the wheel at all. As we were trying to come up with a solution, we played around with a sharpie, a saw (trying to cut some of the surface to make a ‘different’ patch), an open flame (outside), and a few other things before finally settling on a piece of card stock with a strip of retro reflective tape. This worked well enough through the CMP, but we ended up replacing the cardboard discs with a purpose built plastic part before our first offseason.
Wasn’t a good portion of this strip on the metal hub itself?