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#1
10-02-2022, 11:50 AM
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'If' running tubes in TLRs, do you....
Change PSi VS running same TLR tubeless.
Change pressures between tube types VS one to the other. ie Tubilito, Aerothan, latex, butyl etc.. Context; mounted Pirelli P-Zeros 30mm yesterday. One Aerothan in front, rear Butyl. Deciding weather to try a latex, then Aerothan in the rear. Should use them after I wasted 90.00 on 3 I figure. Nick in Oregon City effected my thinking and in a moment of internet weakness, I bought 3. I like to try stuff to know for myself really the reason... FYI, I don't like running tubeless at higher pressures [road], so easy on me with the take tubes out and run tubeless please. 
__________________
This foot tastes terrible! 
Last edited by robt57; 10-02-2022 at 11:52 AM. 
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#3
10-02-2022, 02:42 PM
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From trial and error, I know what pressure I like for my road tires and I stick with that for both latex and butyl inner tubes. Off road or mixed surface pressure of course varies a lot depending on the conditions.
I do think the latex tubes improve the ride feel. I’ve had great luck with Vittoria latex tubes in the 25-28mm size for my road bikes. But for my cross and gravel bikes, I’ve had a bunch of the larger Vittoria latex tubes in 33 to 38mm tires fail at the valve stem. Some failed after a few months, others failed out of the box pumping up for the first time. But always at the valve stem.
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#6
10-02-2022, 03:52 PM
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Theoretically speaking -
Tires support wheel loads by changes in casing tension, and the static casing tension is the product of the internal cross-sectional area times the pneumatic pressure. Because the inner tube thickness reduces the internal cross-sectional area a little bit, for the same performance you'd want to use a little more pressure when using tubes. But this is a difference of only a few psi. Depending on your road surfaces, you might want to add a little pressure anyway to reduce pinch flatting, and this might be a bigger consideration.
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#7
10-02-2022, 03:59 PM
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Quote:
Last edited by Mark McM; 10-02-2022 at 04:01 PM.
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#8
10-02-2022, 05:26 PM
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I was running 25mm tubed tires on 17mm IW rims with what I thought was 80 psi when I suffered a pinch flat from running over a rock. It turns out that my old gauge was off and I only had 72 psi. The zipp calculator recommends 77/82.
I much prefer tubeless with wider rims and larger tires. 28mm tires on 19mm IW Hooked rims require 62/66 and 30mm tires on 23mm IW rims need 50/53. Next is 25mm IW rims with 28/30mm tires and with 50/50 psi. Give or take 1-2 psi. Last edited by Dave; 10-02-2022 at 05:36 PM.
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#9
10-02-2022, 05:31 PM
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Ooppps, wrong forum...
 W.
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#12
10-03-2022, 12:01 AM
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Quote:
https://robrobinette.com/Glowing_Tube_Photography.htm Click on the photos to get full images. W.
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#13
10-03-2022, 06:28 AM
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Quote:
__________________
"There is no perfectionism on the road to contentment."
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#14
10-03-2022, 06:41 AM
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IME, I only have the tubeless tires due to cost and/or availability, have never actually gone tubeless. IME, the tubeless tires need about 5 psi more when using tubes. That is with both butyl and latex, and simply by feel.
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#15
10-03-2022, 10:45 AM
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SRAM actually has a calculator for pressures. I find it useful for a starting point.
https://axs.sram.com/guides/tire/pressure
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