The ones I found were on Hitchcocks website. The inside of the rim flange looks like it is tubeless. But there is a problem I didn't notice before. While it says these fit the B5 Bullet, the rear is an 18", like the Classic. My Bullet has a 19" rear wheel. Going from an 19" to an 18" rear tire is not really what I want to do, unless I could find an 18" tire that had the same outside diameter as the 19" that's currently on it. A smaller rear tire would lower the gearing, though I could probably fix that with a sprocket change. Not sure what it would look like, though cast wheels would kind of ruin the looks of the bike anyway. But I need it to be rideable. I'm not able to fix a flat tube type tire by myself out on the road. I recently had to pay over $300 to have the bike hauled home because of a flat tire.