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Tubular tires and tubeless tires are different.

You don't need tubeless tape, you need different rims. No tubeless tape ever made will help you. Tubulars and tubeless systems are different - very, very different.

Tubular rims don't have any of the features that would retain a clincher tire. Tubeless rims inflate against the rim sidewalls. Their beads lock against the sidewall. The inner width is the distance between the two sidewalls (usually between the two hooks on top of the sidewall, but not all rims have them). This is why you couldn't measure an inner width. The only thing you can mount to those rims is tubular tires, which are very much a dying breed.

Now, tubular glue tapes are a thing, which I guess you could Google if you want to mount tubulars. I strongly recommend you do not do this unless you know exactly what you are getting into. The skills required to mount tubulars are learnable, but they're also dying out. Thus, there are fewer people to learn from. Additionally, for consumers, there's no use case where they're dominant over other options. OK, maybe cyclocross racing, but I don't know that their advantages are worth it there. And who races cyclocross these days?

Tubular tires and tubeless tires are different.

You don't need tubeless tape, you need different rims. No tubeless tape ever made will help you. Tubulars and tubeless systems are different - very, very different.

Tubular rims don't have any of the features that would retain a clincher tire. Tubeless rims inflate against the rim sidewalls. Their beads lock against the sidewall. The inner width is the distance between the two sidewalls (usually between the two hooks on top of the sidewall, but not all rims have them). This is why you couldn't measure an inner width. The only thing you can mount to those rims is tubular tires, which are very much a dying breed.

Now, tubular glue tapes are a thing, which I guess you could Google if you want to mount tubulars. Alternatively, Vittoria's latest tubular glue is supposed to be a lot easier to use, but I have no experience. I strongly recommend you do not do this unless you know exactly what you are getting into. The skills required to mount tubulars are learnable, but they're also dying out. Thus, there are fewer people to learn from. Additionally, for consumers, there's no use case where they're dominant over other options. OK, maybe cyclocross racing, but I don't know that their advantages are worth it there. And who races cyclocross these days? Anyway, I think that for width, you don't want too much of the base tape overhanging the rim. I think the opposite problem (tire too narrow) isn't likely to happen.

Tubular tires and tubeless tires are different.

You don't need tubeless tape, you need different rims. No tubeless tape ever made will help you. Tubular rims don't have any of the features that would retain a clincher tire. This is precisely why you couldn't measure an inner width. The only thing you can mount to those rims is tubular tires, which are very much a dying breed.

Now, tubular glue tapes are a thing, which I guess you could Google if you want to mount tubulars. I strongly recommend you do not do this unless you know exactly what you are getting into. The skills required to mount tubulars are learnable, but they're also dying out so there's not many people to learn from.

Tubular tires and tubeless tires are different.

You don't need tubeless tape, you need different rims. No tubeless tape ever made will help you. Tubulars and tubeless systems are different - very, very different.

Tubular rims don't have any of the features that would retain a clincher tire. Tubeless rims inflate against the rim sidewalls. Their beads lock against the sidewall. The inner width is the distance between the two sidewalls (usually between the two hooks on top of the sidewall, but not all rims have them). This is why you couldn't measure an inner width. The only thing you can mount to those rims is tubular tires, which are very much a dying breed.

Now, tubular glue tapes are a thing, which I guess you could Google if you want to mount tubulars. I strongly recommend you do not do this unless you know exactly what you are getting into. The skills required to mount tubulars are learnable, but they're also dying out. Thus, there are fewer people to learn from. Additionally, for consumers, there's no use case where they're dominant over other options. OK, maybe cyclocross racing, but I don't know that their advantages are worth it there. And who races cyclocross these days?

You don't need tubeless tape, you need different rims. No tubeless tape ever made will help you. Tubular rims don't have any of the features that would retain a clincher tire. This is precisely why you couldn't measure an inner width. The only thing you can mount to those rims is tubular tires, which are very much a dying breed.

Now, tubular glue tapes are a thing, which I guess you could Google if you want to mount tubulars. I strongly recommend you do not do this unless you know exactly what you are getting into. The skills required to mount tubulars are learnable, but they're also dying out so there's not many people to learn from.

Tubular tires and tubeless tires are different.

You don't need tubeless tape, you need different rims. No tubeless tape ever made will help you. Tubular rims don't have any of the features that would retain a clincher tire. This is precisely why you couldn't measure an inner width. The only thing you can mount to those rims is tubular tires, which are very much a dying breed.

Now, tubular glue tapes are a thing, which I guess you could Google if you want to mount tubulars. I strongly recommend you do not do this unless you know exactly what you are getting into. The skills required to mount tubulars are learnable, but they're also dying out so there's not many people to learn from.