Originally Posted by Dave Mayer

Tubular vs. Clincher weight comparison

Tubular:

Shimano C24 wheelset: 1,110g actual
Tires Continental Competition 25s 280g x 2 = 560g
Total: 1,670 g

Clincher:

Shimano C24 clincher wheelset: 1,421g actual.
Tires Continental GP5000 25s 215g x 2 = 430g
Rim strips?
Butyl tubes 100g x 2 = 200g
Total: 2,051 g

Difference: close to 400g or most of a pound.

Don't add a spare tubular, this is an unfair comparison. If you add sealant to the tubular tires, they are just as puncture resistant as tubeless with sealant. But with tubulars, you do not have to add sealant. With tubeless, you do.

And the Conti tubulars have butyl tubes, not latex tubes that you have to reinflate every few days. Compare like for like.

Almost a pound of rotating mass? Huge difference.

Can you get a rim brake option with tubeless? If no add another 110g per wheel (each rotor) of unnecessarily ballast.