The wheels themselves aren't too expensive so i'm not looking to make any real savings there, its attaching them to the robot that is the stumbling point. I think the wheels will come to around £8 per robot and with the time frame we have an off the shelf product would be far better, getting the time to do things like welding and the people to do them is expensive. Peter from the Chariots Guild is currently looking into manufacturing their solution to drill motor/wheel connections and making it available to colleges, but that may not be possible in the time frame that we have so was wondering what other solutions were out there. GiantShark gear looks good to me, very different to how it looked last time I bought one but if it does the same job it'll do nicely.