dwmckee

I have searched the Continental and other sites but have not found if the GP4000s II is tubeless compatible. Does anyone know?

Thanks,

Don

noodle soup

it is not tubeless compatible, but can be used with a tube on most rims that are capable of being tubeless.

ckindt

wut?

noodle soup

The the tire is not to be used without a tube.

Jiggle

I'm sure it would work fine up to about 30 psi. I rode on some Michelin Pro4 for a while just goofing around. But around 50 psi they'd blow off the rims. Recommended if you enjoy danger and have a solid medical insurance plan.

andr0id

Continental has not really embraced the tubeless thing. I don't think any of their road tires are tubeless.

WhyFi

If a tire is tubeless/ready/compatible, the manufacturer's marketing department isn't going to make you look too hard for the info - they'll be rather up-front about it.

bikepro

As everyone else said, the Continentals are not tubeless. A non-tubeless road tire should never be used as a tubeless. On the other hand, some non-tubeless road rims can be converted to tubeless. For instance, The HED Belgium C2 is not a tubeless rim, but I ran it tubeless with no problems. I've since switched to the HED Belgium +, not only because it IS a tubeless rim, but I wanted the wider rim.

If you need a good tubeless tire, the SCHWALBE PRO ONE is a good choice.

dmanthree

It's not, but still feels really, really nice with a "Race Light" tube.

Autobot

They are not. Although my go to in terms of with tubes...

Cubebike1

Why shouldn't a non tubeless be used as a tubeless? I have continental gp 4000 sii set up tubeless and have pumped up to 120 psi without any problems.
My wheels are Reynolds strikes which are tubeless.
Thanks for any replys

redfooj

difference bead structure. i wouldnt trust it to hold.

rpenmanparker 

We were just talking about how sensible people should behave. Feel free to do whatever you want.

rpenmanparker 

Tubed clinchers don't have any butyl inner liner to hold air. They rely on the tube for that. Likely they will deflate rather rapidly.

redfooj

Theoretically the sealant could protect against air loss (if wheels are in motion, not static)...but I'd be concerned more about integrity of actual tire staying in place

Abe_Froman

Why would/should a tube help a tire stay in place? It shouldnt have any real impact on it.

WhyFi

I'm not sure that he's referencing the same thing, but tubeless tires have a different interface with... I don't know if there's a technical term, but I'd call it the shoulder of the rim bed.

When you're installing a tubeless tire, the beads drop in to the channel in the middle of the rim bed. Upon inflating, the beads pop up on that rim bed shoulder and there's a very snug (and sometimes damn tight) interface - the tire will not (or at least should not) rotate/slide on the rim at this point, even when being ridden while deflated. Without this tight interface (as might happen with a non-tubeless tire), I'd be concerned about slippage and the tire 'burping' the air out. I think that some people fudge this by wrapping the rim bed with multiple layers of tape, but I'd use equipment in the manner it was designed rather than hack/bodge it.

Abe_Froman

Oh sure I assumed tubeless tire construction was different in some way. I was just referring specofically to the absence of the tube itself though. For instance...a GP4000 shouldnt be any more or less likely to move slightly with or without a tube. Granted the aftermath may differ though haha.

WhyFi

Well, the inflated tube would be pressing against both the rim bed and the tire carcass - that'd be an awful lot of friction to keep things in place.

joejack951

Air pressure will do the same thing. The issue is that if there is even the slightest breach of the seal between the tire and rim you'll have rapid air loss as the bead of the tire completely loses contact with the rim. Tubeless tires, being locked into the rim, would be a lot more tolerant of a breach, and less likely to have a breach in the first place. And this also assumes that a standard non-tubeless tire's bead even has the proper design to seal against a rim, something it was never designed to do, as opposed to a tubeless tire.

Abe_Froman

If the tube were made out of canvas, sure. But it's rubber, thin rubber, and stretches. It wont due much to hold the tire in place. The only real force at play is air pressure pushing the tire against the inner wall of the rim.

WhyFi

Maybe I'm wrong, but I think that you're overestimating the amount of shearing that the elasticity of the tube would allow at those pressures.

I'm not talking about just where the rim and tire overlap, I'm talking about where it's in relative close proximity to the overlap - I would think that that would add a little more friction than just pressurized air, wouldn't it?

Regardless of the physics, I still wouldn't run non-tubeless tires tubeless.

gsa103

Yes, but if something dislodges the bead a tiny bit, the tube prevents the air from escaping. Once air starts to escape from around the bead, there's no pressure to force the bead back in place in a tubeless setup.

Tubeless tires have a square bead top and an extra rubber flap on the bead to help seal.

It won't fail under normal circumstances, only over bumps or hard cornering, when it can blow off the rim. Using a tubeless rim will help, but good luck...

Grasschopper

Ok I'll ask the question...if the whole point of tubeless is to run lower pressures for added comfort and lower rolling resistance...why would you pump it to 120psi?

joejack951

I'm not really clear on what you are describing. I'm listening if you want to try and clarify. But we agree that trying to run non-tubeless tires tubeless is a bad idea. It would take a miracle to ever get an air seal to begin with and you'd have to really hope you never hit a pothole or else you'd likely instantly lose all that pressure.