Hi,
I am wondering what pressure are you riding your GP5000 TL with?
For some context, I am pretty lightweight (66kg - 145lbs) and am using Enve 5.6s with 25mm GP5000s. 30ml orange sealant in each but I guess that does not change much.
I have tried different pressures so far but cannot decide what works best.
Thanks
I’m 190lbs and ride the GP5000TL on Hed Jet 6 for crit racing at 75psi front and 80psi rear.
What criteria made you choose this combination? I believe it’s more rolling resistance/efficiency rather than confort but I may be wrong.
I have tried stuff in the 75-85psi range but given our difference in weight I should probably try way lower
Silca has a theoretically science-based pressure calculator on their site:
https://info.silca.cc/silca-professional-pressure-calculator
Bear in mind tire width is measured width, not what’s printed on the side.
What criteria made you choose this combination? I believe it’s more rolling resistance/efficiency rather than confort but I may be wrong.
I have tried stuff in the 75-85psi range but given our difference in weight I should probably try way lowerI really haven’t experimented much, but for Hed Jet wheels the max pressure for tubeless setup is 80psi so i started from there for the rear and just did 5psi less in the front. It feels so good, both comfort and speed-wise, and corners so well, that I haven’t tried lowering it.
Hed has tire pressure info on their website, but it may or may not apply to your wheels but maybe it’s a good starting point for you. https://store.hedcycling.com/tire-pressure/
I’m ~78kg, and I currently use 90PSI front, 95 PSI rear (25mm TL) for general purpose riding.
(Happy to see this is almost exactly what the Silca tool told me to do - haven’t used that before).
I use a bit more for crits on pristine surface, less if I’m going through warzone-like broken roads or doing gravelly-road.
ENVE recommends max air between 68-72 psi based on your weight and tire size. I assumed you tried something close to that already, how did you feel in that pressure range?
Thanks - they suggest 75 psi whereas Enve says 70. Will probably do some more trial and error within this range
Silca has a theoretically science-based pressure calculator on their site:
https://info.silca.cc/…-pressure-calculator
Bear in mind tire width is measured width, not what’s printed on the side.Really doesn’t work unfortunately when the calculator spits out 95’ish psi for wheels that say max 80psi. Also no differentiation between tube and tubeless?
Thanks - Enve has a similar recommandation page indeed, never saw it
.
Hi,
I am wondering what pressure are you riding your GP5000 TL with?
For some context, I am pretty lightweight (66kg - 145lbs) and am using Enve 5.6s with 25mm GP5000s. 30ml orange sealant in each but I guess that does not change much.
I have tried different pressures so far but cannot decide what works best.
Thanks
Same tires, same wheels (the disc version), different weight – 175 lbs. I use 80 psi rear 72 psi front on smooth pavement and I’m happy with it. If I rode rougher surfaces more, I would go with 5 or 10 psi less.
I rode my 32mm at 45-50psi when I had a chance to ride the Alpes and Pyrennees this year. That was about perfect. On a 25mm I don’t go above 60psi anymore, and that is with a tube. For 25s that were tubeless I would start at 60 and go down, maybe as low as 50psi. Why anyone would ride tubeless above 60psi (unless you are heavier) is beyond me.
ok so even lower than what I’m about to try…
what’s the lowest you’ve tried on the 5.6s?
Silca has a theoretically science-based pressure calculator on their site:
https://info.silca.cc/…-pressure-calculator
Bear in mind tire width is measured width, not what’s printed on the side.Really doesn’t work unfortunately when the calculator spits out 95’ish psi for wheels that say max 80psi. Also no differentiation between tube and tubeless?
Why do you assume the calculator is wrong just because the wheel spec doesn’t let you use the suggested pressure?
Surely it’s possible 95psi is the optimum pressure for the tire? Whether you can achieve this within the spec of the wheel is a separate issue and hardly the fault of someone who didn’t choose the wheel!
Should the results for tube and tubeless be different?
The optimum pressure is a function of comfort and rolling resistance. I wouldn’t expect much, if any, difference between tubed and tubeless systems. Why do you take issue with this?
Maybe I’m misunderstanding your post, but it seems to me that neither of your complaints stack up.
ok so even lower than what I’m about to try…
what’s the lowest you’ve tried on the 5.6s?
That’s the lowest I have gone with them. The lower pressures (for rough surfaces) are based on the fact that the 5000TL’s measure bigger than 25mm. I’m generally a lot happier with the tires at 80 rear / 72 to 75 front. Even at 80 psi, I can start to get a little rear tire squirm powering up steep grades.
Silca has a theoretically science-based pressure calculator on their site:
https://info.silca.cc/…-pressure-calculator
Bear in mind tire width is measured width, not what’s printed on the side.Really doesn’t work unfortunately when the calculator spits out 95’ish psi for wheels that say max 80psi. Also no differentiation between tube and tubeless?
Why do you assume the calculator is wrong just because the wheel spec doesn’t let you use the suggested pressure?
Surely it’s possible 95psi is the optimum pressure for the tire? Whether you can achieve this within the spec of the wheel is a separate issue and hardly the fault of someone who didn’t choose the wheel!
Should the results for tube and tubeless be different?
The optimum pressure is a function of comfort and rolling resistance. I wouldn’t expect much, if any, difference between tubed and tubeless systems. Why do you take issue with this?
Maybe I’m misunderstanding your post, but it seems to me that neither of your complaints stack up.i didn’t say the calculator is wrong, but that its value is irrelevant if it does not match with the specs of the wheel. If it says 95 psi when the wheel doesn’t allow that, the 95 is not practical. Which then also begs the question - why is there a discrepancy? Does the calculator miss variables or are the wheels underspec’ed? Whichever it is - there’s a discrepancy and in this case you have to go by the wheel builder’s recommendation. And besides just the upper limit, it seems the Hed pressure chart recommends much lower pressures than Silca appears to do. Maybe other wheel companies are closer to Silca’s suggestion or maybe they’re just as different, you tell me.
And don’t tubeless tires usually run at lower pressures vs standard clinchers? Example the article here where the pressure recommendations by Hunt and Continental are lower for tubeless vs an equivalent regular clincher: https://road.cc/content/feature/268427-how-do-you-choose-right-tubeless-tyre-pressure-we-speak-hunt-and-continental
You CAN run tubeless tires at lower pressure than clinchers because there’s no risk of pinch flatting. Doesn’t mean you should. The optimal pressure for a certain size tire on a certain roughness road doesn’t care if it’s tubeless or not. It only matters if the optimal pressure is so low that a clincher would be at high risk of pinch flatting.
You CAN run tubeless tires at lower pressure than clinchers because there’s no risk of pinch flatting. Doesn’t mean you should. The optimal pressure for a certain size tire on a certain roughness road doesn’t care if it’s tubeless or not. It only matters if the optimal pressure is so low that a clincher would be at high risk of pinch flatting.Except the wheel manufacturers and tire manufacturers say you should…
Silca has a theoretically science-based pressure calculator on their site:
https://info.silca.cc/…-pressure-calculator
Bear in mind tire width is measured width, not what’s printed on the side.Really doesn’t work unfortunately when the calculator spits out 95’ish psi for wheels that say max 80psi. Also no differentiation between tube and tubeless?
Why do you assume the calculator is wrong just because the wheel spec doesn’t let you use the suggested pressure?
Surely it’s possible 95psi is the optimum pressure for the tire? Whether you can achieve this within the spec of the wheel is a separate issue and hardly the fault of someone who didn’t choose the wheel!
Should the results for tube and tubeless be different?
The optimum pressure is a function of comfort and rolling resistance. I wouldn’t expect much, if any, difference between tubed and tubeless systems. Why do you take issue with this?
Maybe I’m misunderstanding your post, but it seems to me that neither of your complaints stack up.i didn’t say the calculator is wrong, but that its value is irrelevant if it does not match with the specs of the wheel. If it says 95 psi when the wheel doesn’t allow that, the 95 is not practical. Which then also begs the question - why is there a discrepancy? Does the calculator miss variables or are the wheels underspec’ed? Whichever it is - there’s a discrepancy and in this case you have to go by the wheel builder’s recommendation. And besides just the upper limit, it seems the Hed pressure chart recommends much lower pressures than Silca appears to do. Maybe other wheel companies are closer to Silca’s suggestion or maybe they’re just as different, you tell me.
And don’t tubeless tires usually run at lower pressures vs standard clinchers? Example the article here where the pressure recommendations by Hunt and Continental are lower for tubeless vs an equivalent regular clincher: https://road.cc/...hunt-and-continental
You’re looking at things backwards.
Rolling resistance, grip, and comfort performance are functions of the tyre, not the wheel. The wheel is there to hold said tyre in place, allow it to be inflated, and transmit loads from the tyre/road interface to the bike frame. The rim bead width/shape and channel volume will interact with the tyre but aside from that the wheel is pretty much irrelevant in determining the optimum tyre pressure for rolling/grip/comfort performance which is the purpose of the calculator. If the Silca calculator values are sensible but your wheel does not allow that pressure, you have an equipment compatibility/suitability problem. That’s not a fault of the calculator and doesn’t mean “it’s value is irrelevant”. Surely you want to know the optimum value for the tyre, regardless whether or not other components allow you to use it. If you can’t use it, then you’ll have to settle for getting as close as you can based on the equipment available to you. Do you expect the calculator to look up your equipment specs for you too?
This all eems patently obvious. What am I missing?
As for the comment re tubeless, the previous poster pretty much covered that. Tubeless setups permit lower pressures without risking pinch punctures. just because they CAN be used at lower pressure doesn’t mean they SHOULD be used at lower pressures. For road setups, you’re probably at no real risk of a pinch puncture at the suggested pressures anyway, so what difference does it make whether you’re using tubed or tubeless?
The link you provided doesn’t have any useful info to refute what’s being said here. Even if it did I’d take Josh and Tom’s data over a guy from Hunt’s marketing spiel any day. Yes, Josh is selling something too, but his data is somewhat more substantial, reasoned, and fact based.
What tire and what wheel with what weight?
This sounds suspiciously like you are using a tire that measures too narrow for the wheel. (And what did you use to measure the tire width?)