Summary

The foam wheels did not last long for me so I made replacements.
This was made to fit a 2.3mm rod/landing gear. So far has held together well and after some hard landings.
Don't mind the grass stains its just been tested:)
Also included are wheel collars, a little dab of hot glue on the back holds them on nicely (cone side towards the wheel)
http://shop.flitetest.com/aircraft/ft-3d-speed-build-kit/