Tubeless, how narrow have you gone? Results?

[kppolich]

Originally Posted by Dave

Anyone who thinks they run under 60 psi in a 25 or 28 should check their gauge for accuracy. My old silca pump gauge was reading 8 psi higher than the readings from several brand new Winters liquid filled gauges. None of the pressure calculators would recommend that low, even at my 61kg.

Tubeless GP5000TL 700x28 at 55psi at 70kg all day. Plenty fast. Craftsman digital inflator for pro accuracy.

[Likes2ridefar]

Originally Posted by Dave

Anyone who thinks they run under 60 psi in a 25 or 28 should check their gauge for accuracy. My old silca pump gauge was reading 8 psi higher than the readings from several brand new Winters liquid filled gauges. None of the pressure calculators would recommend that low, even at my 61kg.

I got caught a few times letting my 25mm run down to 30-40 psi with no issue. Certainly not going to race but it was an enjoyable commute still.

[mtechnica]

Originally Posted by kppolich

Tubeless GP5000TL 700x28 at 55psi at 70kg all day. Plenty fast. Craftsman digital inflator for pro accuracy.

Idk seems a little on the low side but whatever works!

[Gummee]

28c is the smallest I've gone tubeless. ...and I just built those wheels and stuck Schwalbe Ones on em. Haven't even ridden em yet.

The other wheels have 32c GP5Ks on em. No problems in the 18mos they've been on the bike

M

[Dave]

Originally Posted by kppolich

Tubeless GP5000TL 700x28 at 55psi at 70kg all day. Plenty fast. Craftsman digital inflator for pro accuracy.

That means nothing if not compared to other gauges of known accuracy. A digital gauge can be inaccurate. Pressure that's too low may work fine under good conditions, but there's a point when too low increases rolling resistance.

[kppolich]

Originally Posted by Dave

That means nothing if not compared to other gauges of known accuracy. A digital gauge can be inaccurate. Pressure that's too low may work fine under good conditions, but there's a point when too low increases rolling resistance.

55 Front, 60R, checked with this (below) within .3psi of the digital display on the craftsman (craftsman says 55, this says 55.3), thanks.

[nalax]

Originally Posted by DHallerman

Soon I’ll be trying 700x32 tubeless, either GK slicks or Conti GP 5000s, on a rim brake road bike, and they don’t appear too much of a step smaller than 35s. For mainly paved roads, I’m thinking tire pressure about 45-55 psi. Good?

Dave, I've been running 700x32 GP5000TLs on Belgium + and they measure out to 33.5 mm at 55-60 psi so it's close to 35mm. This week I threw on 28mm GP5000TLs and I'm at 29.6mm width. It's subjective, but I really like how these roll for my 145 lbs. You might consider 28-30mm for your next tire and skipping 32 as that might be close to your 35 tires.

[bshell]

Dave, wrt pressures on 25mm tires -I was pretty surprised, too.

These numbers are based on a glycerin filled Winters gauge that I added to my pump w/ an extension to place it at the handle instead of my feet.

So much nicer than the chinese gauge with teeny tiny markings, stupid range, etc.

I was curious about the liquid inside the dial and the guy at the hose/fitting shop told me it was just to stabilized the needle on machinery that vibrates. Love learning new things.

[DHallerman]

Thank you all for your opinions and true-life tales! I find these back-and-forth dialogues here truly helpful. This is like Rotten Tomatoes for tubeless tires.

And when reported data matches up, very cool. I’m also 145 lbs and will run the same 700x32 GP5000TLs whenever the supply chain delays produce my backorder. Until then, I’ll ride this incoming bike with same size GK slicks. I’ll mount either 700x32 tire on Velocity A23s, curious what real measurements will be at around 55 psi.

Thinner tubeless tires will be a winter project for one of my more traditional road bikes; see about 28s and 25s. See what the world’s supply chains make available in our very internationally sourced sport.

Dave, who likes to figure out for any bike how many different nations contributed to the build and memory says 9 has been the highest number

Originally Posted by nalax

Dave, I've been running 700x32 GP5000TLs on Belgium + and they measure out to 33.5 mm at 55-60 psi so it's close to 35mm. This week I threw on 28mm GP5000TLs and I'm at 29.6mm width. It's subjective, but I really like how these roll for my 145 lbs. You might consider 28-30mm for your next tire and skipping 32 as that might be close to your 35 tires.

[DHallerman]

Originally Posted by bshell

These numbers are based on a glycerin filled Winters gauge that I added to my pump w/ an extension to place it at the handle instead of my feet.

Sounds like a great kludge. I’m trying to picture your setup. Might you have a photo or two you could spare?

[bshell]

...I suck at computers

I'm embarrassed to say that I don't know how to add a picture but I will try to figure it out. Maybe add a bike pic in a thread or two!