Re: Urethane Wheels Run off Cim Motor
 

They stretch a lot. You might have to mold your own urethane tread around an aluminum or plastic rim that doesn't buckle. (I think 118 does this? Not sure.)

Re: Urethane Wheels Run off Cim Motor
 

Yep. They actually do a custom wheel mold too.

Just tread a wheel or buy one. Its much easier, and the wheels that are out there are already great solutions for drivetrains.

Re: Urethane Wheels Run off Cim Motor
 

Colson makes a lot of wheels in addition to the "Performa" line sold cheaply at RobotMarketplace.

Colson has a line of polyurethane-tread wheels molded over aluminum, polyolefin, and cast iron cores. You can see the specs for these wheels here:

http://www.colsoncaster.com/products...e/default.aspx

I found some 6" polyurethane on polyolefin wheels on eBay for about $10 apiece.

I can't comment on the construction and concentricity of these wheels as I haven't received them yet, but if you ask me again in a few weeks I should have an answer for you.

Re: Urethane Wheels Run off Cim Motor
 

There's a lot more that goes into whether or not a wheel is good for frisbee shooting than "does it use polyurethane"? Polyurethane varies widely in durometer (hardness), thickness, etc. The blue McMaster polyurethane wheels used by many teams this year have a very thick polyurethane layer (seemingly over an inch of polyurethane) bonded to a metal hub / core. Many wheels (Colsons I believe) have a much thinner polyurethane tread molded over a plastic core. Your mileage may vary.

While Gregor's suggestion was somewhat snide, if you do not have the machining capability to make a simple press-fit hub, these wheels really aren't the best option for your team. Investing in several of the Blue Banebots rubber "poverty" wheels would probably be more beneficial. Do note that despite being the same durometer, the Banebots wheels have drastically different wear characteristics than the McMaster wheels, and they need to be changed out over time.

Re: Urethane Wheels Run off Cim Motor
 

Unless price is a huge driving factor (and it being so late in season, concerns over wear become smaller) the mcmaster urethane wheels are mounted incredibly easy with the style hub I recommended.

If you're trying to be cheap and fast, can't argue with the poverty wheels for a single offseason event if you're not going to practice much going into it.

Re: Urethane Wheels Run off Cim Motor
 

Hey, since when did we start calling them poverty wheels? :p

Relevant note, we've found a few machining sponsors in Walter's (LedLove96) area. We'll have them up and running with new resources soon :)

Re: Urethane Wheels Run off Cim Motor
 

I was hassling 330 and 1717 at the LA regional for their poverty wheels, I guess it stuck after that.

Luckily they both switched to respectable wheels after that event.

Re: Urethane Wheels Run off Cim Motor
 

It is true. while we are going to be using the "poverty wheels" for club fair and a demo coming up, we hope to have hooked up with a sponsor and have some hubs machined by the Cow Town Throw Down. While a single off-season event will not be worth the wheels, the sponsorship gained just might,

Re: Urethane Wheels Run off Cim Motor
 

Seeing as I'm on the team that first made these wheels popular, I will say that there are better options. However, giving them a name like this may stop a lot of teams from using them and potentially stopping them from making themselves better. Let's not let this get too far out of hand. Also, seeing as Banebots have been a long time sponsor of FIRST I doubt they want any of there products referred to like this. I completely get the joke and would probably make it myself but once it gets out in to the community in can have many negative effects.

Re: Urethane Wheels Run off Cim Motor
 

I can agree with all points made except their reputation.

Sponsoring FIRST doesn't mean their poor product and quality control should just be ignored.