It doesn't look like a clincher rim, so it would be a tubular rim. Tubular tyres need to be glued to the rim.
Someone else may tell you differently, and more correctly, but those rims are not for modern clincher tyres.
You're lucky that you weren't going down a steep hill and taking a sharp bend on those.
Thanks, and spectacular, new rims it is then... lame, unless its a lot easier than i think it is to glue the tire to the wheel...
Thanks, and spectacular, new rims it is then... lame, unless its a lot easier than i think it is to glue the tire to the wheel...