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Low pressure tubeless, rolling resistance holy grail?

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Low pressure tubeless, rolling resistance holy grail?

Old 03-12-22, 04:35 PM
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waters60
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Low pressure tubeless, rolling resistance holy grail?

Anyone switched from high pressure tires to lower pressure tubeless with similar rolling resistance? Most specifically any increase in comfort?
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Old 03-12-22, 05:22 PM
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Yes, and yes.
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Old 03-12-22, 05:43 PM
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Q1. no/yes
Q2. Yes/No
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Old 03-12-22, 05:53 PM
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I've been running modern 28s on wide, hookless rims at <60psi for a couple years. Wouldn't go back.
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Old 03-13-22, 09:34 AM
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Yes and yes. I’m running 28s at 55/58 it’s fantastic
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Old 03-13-22, 02:07 PM
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I used to run 23s at 105ish, and then moved to 25s at 90-95ish. I now run 28/29s (these are all true measured sizes) at 75F/80R. I go as low as 70 but beyond that, they definitely FEEL more sluggish when accelerating especially. I'm quite comfy at 75-80 and my times on segments are similar so that is where I am. If the roads are rougher, I'll drop to 70/70. If I went to 30-32, I'd run 60-65. I also have used (I'm 176 lbs bodyweight) a couple of apps to determine optimal PSI and I'm close to those as well.
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Old 03-14-22, 06:55 AM
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I use the pressure calculator at zipp.com. It was spot on with 19mm hooked rims and 28mm tires, but recommended only 52 psi front with 23mm hookless rims and 30mm tires. I ran that pressure for a few rides, but it felt too squishy for me, so I added 5 psi. It's important to have an accurate pressure gauge. Many aren't. Very happy with lower pressure tubeless.
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Old 03-14-22, 06:57 AM
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Originally Posted by DaveSSS View Post
I use the pressure calculator at zipp.com. It was spot on with 19mm hooked rims and 28mm tires, but recommended only 52 psi front with 23mm hookless rims and 30mm tires. I ran that pressure for a few rides, but it felt too squishy for me, so I added 5 psi. It's important to have an accurate pressure gauge. Many aren't. Very happy with lower pressure tubeless.
One of mine is off by 11 psi. It is the one on the floor pump. Very good point that you make.
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Old 03-14-22, 07:02 AM
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Originally Posted by waters60 View Post
Anyone switched from high pressure tires to lower pressure tubeless with similar rolling resistance? Most specifically any increase in comfort?
Yes and yes. Topic beaten up to death in the past 2 years.

Try it, you will love it.
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Old 03-14-22, 11:12 AM
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Originally Posted by waters60 View Post
Anyone switched from high pressure tires to lower pressure tubeless with similar rolling resistance? Most specifically any increase in comfort?
Yes. I went from 700 x 28 with tubes run at 110 PSI to 700 x 28 Tubeless run at 80 PSI.

The speed and rolling is the same (or slightly changed, I can't tell) but the comfort is greatly improved.
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Old 03-14-22, 02:53 PM
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Originally Posted by Koyote View Post
Yes, and yes.
This.
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Old 03-14-22, 03:31 PM
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Originally Posted by vespasianus View Post
Yes. I went from 700 x 28 with tubes run at 110 PSI to 700 x 28 Tubeless run at 80 PSI.

The speed and rolling is the same (or slightly changed, I can't tell) but the comfort is greatly improved.
why were you running them that high to start with? I run 700x28s at 80psi with latex tubes at 180lbs
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Old 03-14-22, 03:44 PM
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7-8 years ago I was running 23s with tubes at 110psi on 16mm i.d. hooked rims.
Today I'm running 28s without tubes on 23mm i.d. hookless wheels at 60psi.

I have no idea what the rolling resistance situation is, but I'm faster now than I was then. Also more comfy.
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Old 03-14-22, 06:28 PM
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vespasianus
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Originally Posted by redlude97 View Post
why were you running them that high to start with? I run 700x28s at 80psi with latex tubes at 180lbs
Because I was 215 lbs and wanted the lowest rolling resistance and thought the high pressure would get me there.
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Old 03-15-22, 01:01 PM
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Originally Posted by vespasianus View Post
Because I was 215 lbs and wanted the lowest rolling resistance and thought the high pressure would get me there.
My bad. I wrongly assumed the implication that was that switching to tubeless let you drop the pressure 30psi by itself. The correct pressure between tubes and tubeless shouldn't differ much
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Old 03-15-22, 01:29 PM
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Originally Posted by msu2001la View Post
7-8 years ago I was running 23s with tubes at 110psi on 16mm i.d. hooked rims.
Today I'm running 28s without tubes on 23mm i.d. hookless wheels at 60psi.

I have no idea what the rolling resistance situation is, but I'm faster now than I was then. Also more comfy.
Careful- comments like these and you’ll get a whole lot of angst from some corners…

I agree, I’m faster now on 28s running at 55/58 than I was on 23 running 100+ 8 years ago.

I was also 15 pounds lighter then and likely in better cardiovascular condition. I’m actually considering going even a little bigger.
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Old 03-15-22, 02:20 PM
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Originally Posted by msu2001la View Post
7-8 years ago I was running 23s with tubes at 110psi on 16mm i.d. hooked rims.
Today I'm running 28s without tubes on 23mm i.d. hookless wheels at 60psi.

I have no idea what the rolling resistance situation is, but I'm faster now than I was then. Also more comfy.
This is me almost exactly. My old bike has 700x23's at 110 or higher I'm running 32's at around 70-80.Now I'm faster and more comfortable. My new build is old school and wont take wide tires so I'm running 700x25's tubed at 90-100. A fair compromise but not nearly as nice as the 700 x 32's.
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Old 03-15-22, 04:07 PM
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Originally Posted by redlude97 View Post
My bad. I wrongly assumed the implication that was that switching to tubeless let you drop the pressure 30psi by itself. The correct pressure between tubes and tubeless shouldn't differ much
In some ways it can. I would never have gotten away with running 80 PSI in my tubed tires without getting a flat. With the tubeless set up, I can.
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Old 03-15-22, 04:29 PM
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redlude97
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Originally Posted by vespasianus View Post
In some ways it can. I would never have gotten away with running 80 PSI in my tubed tires without getting a flat. With the tubeless set up, I can.
It gives you a little buffer from pinch flats but the psi difference is not that much. Especially if you are running latex tubes which already are more pinch flat resistant
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Old 03-15-22, 10:13 PM
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These two sites are very helpful when figuring out which tires to buy for low rolling resistance https://www.bicyclerollingresistance.com

And the optimal pressure to run your tires at: https://silca.cc/pages/sppc-form
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