Yeah as per title. Does it roll less effectively as regular tires? Heavier than the non-Kevlar version? Are there anything better than Kevlar for puncture resistance quality?

1. Maybe a bit more rolling resistance
2. Yes, heavier. Check the specs
3. Don't know - there is aramid but it is related to Kevlar

I'm rolling on non-Kevlar versions of Primo Comets on two bikes currently - have previously put thousands of miles on Kevlar version of the same tires. Not sure if I can tell the difference in performance. Have been very lucky on both K- and non-K tires - no flats in a long, long time. (knock on head)

Weight. Cost? Shop around.

I've put a lot of time on a couple of sets of kevlar tires. Yes they do not roll quite as well as their non kevlar siblings. But a set of Panaracer Tourguard tires that I put onto a bike that had Hutchinson non kevlar tires actually rolled BETTER with the Panaracers. But it's really, really close and depends on brands and tires being compared. Yes, they are slightly heavier so they are a slight bit slower to accelerate. But again that depends on brands. And yes, they are worth it if your route results in fairly frequent flats. Out of the likely 10K to 12K miles I put on the two sets of mine over the years I don't remember EVER having a flat with either set. With the other bikes with regular tires I typically get about one flat a month. Now that's not a lot by a lot of people's standards but to not get ANY flats with those two sets after many collective years of riding over the same route where the other tires get about one flat a month says something to me.

And Kevlar is actually a brand name for the aramide fiber from Dupont. But it's become almost universal to call all aramide fiber products Kevlar much like bandaids or jello

They're usually a few bucks more, and the belting adds some weight. But you can save that weight back if you normally run a wire bead tire and switch to a folding bead. My wire bead 28mm Gatorskins are only 10g lighter than my 32mm folding bead Pasela TGs.

Aramid is a class of chemical polymers, Kevlar is the brand name of one of them. I think Aramid is used as a generic term, kinda kinda like Kleenex and facial tissue.

Flat reduction overrides any minor drawbacks.

Unless you're the type that drills his parts to shave off weight and uses a lab scale to weight the bike parts you won't tell much difference. The reduction, or even complete eradication, of flats is worth the few ounces of extra weight and some barely noticeable rolling resistance.

Adam

Oh NOW you've gone and done it. In my experience, these words should never be uttered even with the Knock on Head caveat.

I realize that now I am DOOMED!

I'm pretty certain Kevlar is the Dupont branded version of aramid. Dupont trademarked the name so only they can use Kevlar. Other manufacturers have to refer to it as aramid.

Edit: Oops, sorry for the repeated info, I just read post #6 above. It basically said the same thing.