I'm trying to put Contenental Grandprix 4season 23mm tires on my flow disk and 90 clincher and for the life of me I can't get the tire on the rim. I've tried soap, squeezing the tire as tightly as I can in the channel, even used a blow drier to heat it up. Managed to barely get the tire on the disk, but so far no luck with the 90 and managed to break both of my plastic leavers in the process. I'm riding the disk in mortal dread of a flat. I'm fine changing a tire (done it many times), but if I can't manage to get the tire on at home with soap, hair drier, and plenty of time to hurl expletives, I'm screwed in a race. Even on the open road--I'm stuck.

Not sure if it's the Continentals or I'm just an idiot. Anyone have a suggestion for a decent tire that I can actually get on the rim. Also open to any suggestions for getting a tight tire on minus what I've mentioned above. Thanks.