Mavic d321 rims. Its about 30mm internal width. Tape from chain reaction about 9 quid. Discovered that non-tubeless rims have much more internal curvature in the middle which makes popping the tyre into the rim even more difficult, so i used black tape to build up the middle, and taped again over it all with tubeless tape. I had to roll the tyre a few times to help push the walls into the rim and then a giant control tank set at 140psi.