[chrisguyw]

 Pretty quick but I just can't get on with the tyres as they keep coming off the rims. The wheels don't allow for fitting urethanes as the have two ridges for air tyres. Had to fill in the centre section or a dip developed.

Hi Gordon, not sure of your process for filling the center section of "air" wheels, but, this one works very well,......not only does it eliminate "cupping" of the rear tyres, it also allows the tyre to compress more, which allows the outside rear tyre to load more progressively, improving handling and grip.

Cheers
Chris Walker

I use 1/32 or 1/24 sponge tyre blanks......you may already have some, but, blanks can be purchased from Pendle etc.....the one in the photo is a Scaleauto sponge tyre., but several folks make them.

Cut these into strips, and use some rubber cement (not CA) to secure them.

Use a tyre truer (or sand) so that the "insert" is just a few thou. proud of the flanges............if you really want to  go to town, you can file/sand/dremel  both flanges down a few thou, (before gluing the sponge) which will add to the overall compressibility of the tyre.

Glue and true, and away you go !!