[Closed] Road bike tubeless tyre pressures

I’m running 28mm wide GP5000 tubeless tyres in my Giant TCR at 70psi. I am less than 70kg.

Suggest 70 front 75 on the back for you. I think your rims are safe as long as you check your tyre pressures every day you ride.

Hardly ever run over 60psi on my 30/35cs. Why not go with the recommendation and make adjustments once you know how it feels?
Stans works fine in road tyres.

But.. you'll get 50 answers of different pressures and different sealants, so you'll have to make your own choice in the end! 😀

Doesn't sound too low to me, I'm heavier than you and was running 70/75 in my tubed GP4000s

83kg here and 60psi in a 30mm.

I'm 80kg and run 60/70 psi for 26mm GP5000s (they're 28mm but only come up 26mm on my Zipp 404 rims).

79kg and I'm running my gp5000s (tubed) at 60psi (Hunt 50s)

70kgs on 25mm 65psi front 70 rear

Thanks all. Looks like I’ll start with Zipps recommendations and take it from there.

It is a crazy head**** but it works!

There was a guy I met on a biking holiday last year and he swore by 45psi in his tubeless Continental GP5000. Think they will have been at least 28mm but he still probably weighed 70kg or so.

There is a chart around somewhere that gives tire pressures for a given weight/vertical deflection. Basically it suggests we're all running pressures too high. With tubes you want to completely eliminate the chance of a pinch flat. So that's essentially zero bottoming out on a ride. Whilst you don't want to be bashing/bottoming the rim persistently, what might have caused a pinch flat won't affect tubeless, you can get away with lower and on the off chance you bottom out, it won't have that likely consequence it would have for a tubed tyre.

Pressure will also partly depend on how sturdy the side wall is. So that probably means tyres like Vittoria open tubeless need to be at a higher pressure than tyres with a more rubbery side wall

I rode with 23mm GP5000 front tubed @95PSI and "28mm" (really ~31.5mm) GP4000S II rear tubed @75PSI for my trip to Milland Hill on Monday afternoon.

I'm ~80Kg, bike/kit/water/fuel/mobile/GPS/pump/repair kit etc. an extra ~14Kg

From Silca. There's even a video some where to go with it.

https://silca.cc/pages/sppc-form?utm_campaign=Sample%20Sale&utm_medium=email&_hsmi=94455378&_hsenc=p2ANqtz--EcYduUjG0ol6urlBAfvleUyPgcAB2Mj0a6oWqSiafioevjXIfADpg9-whdLFgQkBMshkxPEehyFY1d_s7Bshegmr3DQ&utm_content=94455378&utm_source=hs_email

Thanks, the Silca website comes out a few PSI higher than the Zipp calculator, but seems they are both reasonably close to each other so definitely the ball park to start with.

I think it's worth testing in 5psi increments as other factors such as rim stiffness make a difference too. You can get a feel for it then.

I try to get it so it takes the edge of the surface of the road but then if I go 5psi lower it feels slower.

75 & 80psi @ 25mm @ 80kg fwiw

72kg, GP5000 32TL on 20-22mm internal width rims at 55 front and 60 rear.

There is also the Mavic App. iOS and Android.

I’d say the guide sounds about right for your weight, especially if you ran 90 with tubes, I’d want to drop at least 20 by going tubeless on the road.

The last road tubeless I used on 28s I ran at 50/55, at 75kg and never had an issue, but were nice and comfy and didn’t notice any downsides.

I’d only run 70 with tubes in a 28.

Well the tyres are on and initial pressure of 65f 70r and an initial ride around the block and they feel fine - too short to suss out if they feel lower resistance or better over the road texture and lumps and bumps. It is indeed a "crazy head****" as Joe put it. Initial observation though is that the GP5000TL's in 28mm guise are coming up noticeably thinner than the GP4000's in 28mm width. No back to back measurements, but could measure against my second wheel set with 28 GP4000's, but that is a wider rim. More aero I guess.