I just bought some cheap wheels from MUTR Teaching resources now called MindSets.
The green ones seem good at 39mm diameter and they are a tight fit on the motor gearbox 3mm shafts, weigh in at 2.8gms and cost 32p inc vat. The O ring tyres they sell aren't so good for grip and weigh in at a further 4 gms.
http://www.mindsetsonline.co.uk/product ... id=1009819
I also got some of the large spoked black wheels which are a bit too big at 75mm again they are a good tight fit for 3mm shaft weigh 11.4gms and cost 53p inc vat. Again the O ring tyres are not that great at15.5 gms
http://www.mindsetsonline.co.uk/product ... id=1009370
Cheap Wheels
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Re: Cheap Wheels
Nice website,thanks Peter.Lots of interesting stuff.