Marin wrote: ↑Thu Dec 06, 2018 8:49 am
I also thought that was excessive. Let's wait for Jarno's test, but I don't think it'll get that much faster.
Yeah 50ml is a lot, even more so given the 5000TL are fully sealed tubeless tires, not tubeless ready that require sealant to keep air in. They're super heavy to begin with, then adding 50gr of sealant?
On the other hand, if you only use 20ml in tubeless ready tires, it's not going to protect for long before you need to add more but it's probably enough in these.
But testing everything only at 90psi also needs to be extrapolated for real world use IMO, I prefer rollingresistance.com tests at various pressures to give you a better idea of how tires compare in the real world. While most decent 25mm clinchers with tubes usually feel pretty good at around 90psi, my experience with tubeless tires is that they feel like rocks unless you go much lower, probably because they usually have stiffer casings/sidewalls to begin with as is the case with the GP5000TL and Mavic Yksion UST I have now. So while tubeless is faster at the same pressure in theory, in the real world, I find you need to compare them at pressures a good 20-25% lower than clinchers for a similar feel/grip and then they're not faster by much, if at all... They might start to have an advantage if you live somewhere the road surfaces are very rough... or if you flat a lot obviously... but I think rolling resistance is not a good reason to go tubeless.
Personally I'm going back to tubes as I don't flat very often... so less trouble/maintenance and lower cost (even more true comparing the mileage you get out of a Grand Prix vs Schwalbe Pro One or Mavic Yksion UST)... and I never had issues or noticed people around me having issues with GP4000sII sidewalls, different roads than those who do have issues I guess, but I have ridden them in gravel and off-road more than just a few times, I'll give the GP5000 a try but the tubed ones. I've had Vittoria sidewalls splitting and Mavics, although the UST are much better than past Mavic tires, they still get sliced quite easily, and I've seen a few slices too long for sealant to save them...
But tires, while not as much as saddles, seems to be a very personal thing.