Collection of tire pressure calculators (2024)

Are there any other tire pressure calculator worth reviewing besides these 4?

63 - 64 psi = www.enve.com/learn/tire-pressure
68 - 73 psi = https://axs.sram.com/guides/tire/pressure
75 - 80 psi = https://silca.cc/pages/sppc-form
68 - 88 psi = www.renehersecycles.com/tire-pressure-calculator

Don't ask me about my weight, rim internal width, type of tire (e.g., vulcanized, cotton, tubeless, tubular) riding style, etc.
Just plug in your values to compare to draw a conclusion.

Racing is a three-dimensional high-speed chess game, involving hundreds of pieces on the board.

CBA = Chronic Bike Addiction
OCD = Obsessive Cycling Disorder

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His: Orbea Orca OMX
Hers: Cannondale Synapse HM Disc

TLN wrote: ↑

Fri May 19, 2023 6:28 am

1. 67-67
2. 65-69 (no idea why hookless and hooked show different pressure tho)
3. 69-71
4. 73-90 (never asked about hooked/hookless, 73+ is a no go on hookless).

It's really funny with the numbers.
If we measure F/R weight positioned on our bikes we'll see weight balance F/R.
Tires should be inflated accordingly.
Most have way more weight to the rear. So a front tire should have less pressure than rear.
15% is probably not even sufficent. But i've seen suggestions that it's a good starting point for a forward race position.

Bikes:

Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)

Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.

mpulsiv wrote: ↑

Thu May 18, 2023 6:16 pm

68 - 73 psi = https://axs.sram.com/guides/tire/pressure
75 - 80 psi = https://silca.cc/pages/sppc-form

Which tyre quality options did you choose? If I put 'standard' on the Zipp page it comes out with a similar offset to this, if I put 'thin' it agrees almost exactly with Silca (high quality tubeless).

wheelsONfire wrote: ↑

Fri May 19, 2023 6:38 am

It's really funny with the numbers.
If we measure F/R weight positioned on our bikes we'll see weight balance F/R.
Tires should be inflated accordingly.
Most have way more weight to the rear. So a front tire should have less pressure than rear.
15% is probably not even sufficent. But i've seen suggestions that it's a good starting point for a forward race position.

The front tyre also has to deal with the balance shifting under braking, where it can suddenly be taking up to 100% of the rider weight.

Karvalo wrote: ↑

Fri May 19, 2023 6:44 pm

wheelsONfire wrote: ↑

Fri May 19, 2023 6:38 am

It's really funny with the numbers.
If we measure F/R weight positioned on our bikes we'll see weight balance F/R.
Tires should be inflated accordingly.
Most have way more weight to the rear. So a front tire should have less pressure than rear.
15% is probably not even sufficent. But i've seen suggestions that it's a good starting point for a forward race position.

The front tyre also has to deal with the balance shifting under braking, where it can suddenly be taking up to 100% of the rider weight.

Yupp, that is truely true.

Bikes:

Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)

Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.

Here's my 02 cents:
Envy = underinflatted
Zipp/SRAM = realistic
SILCA = marginally overiflated

OEM recommendation is ridiculosuly overinflated. I'm lookng at Continental, Goodyear, Michelin, Vittoria, Veloflex, etc.
Instead of printing maximum PSI they should provide average range. Save riders from crashes due to overinflation. It's very unlikiely that a rider will buy the same brand after a nasty experience of a blowout.

Racing is a three-dimensional high-speed chess game, involving hundreds of pieces on the board.

CBA = Chronic Bike Addiction
OCD = Obsessive Cycling Disorder

mpulsiv wrote:Here's my 02 cents:
Envy = underinflatted
Zipp/SRAM = realistic
SILCA = marginally overiflated

OEM recommendation is ridiculosuly overinflated. I'm lookng at Continental, Goodyear, Michelin, Vittoria, Veloflex, etc.
Instead of printing maximum PSI they should provide average range. Save riders from crashes due to overinflation. It's very unlikiely that a rider will buy the same brand after a nasty experience of a blowout.

First it all depends what you are looking for, there is no one optimum.
There is an optimum in terms of performance (where hysteresis -rolling- losses and impedance -vibrations- are at a minimum) and a lower limit in terms of confort (were you hit the tire limits).
Zipp/sram are stuck in their 5bar/73psi limits design due to hookless and give up in performance on normal roads (mean even Movistar do not follow their recommendations!) lowering all pressures versus the performance optimal.

SRAM/Zipp also hit a tire limit since they are designed for a max working pressure sometimes lower than tires minimal recommendation.
Michelin cup 28 min pressure is min5bar/ 73psi, veloflex record 70psi, Sworks turbo is 70 psi. Conti doesn’t officially put one but customer service told me 65-70 psi depending on size. They do it based on safety to retain tire on the rim, to avoid sidewall damages…

Silca is probably the most accurate, the most precise (they cover more parameters including real tire width) in terms of performance.

Now, you loose less being slightly under than over, particularly if roads is worse than expected.

mpulsiv wrote: ↑

Sat May 20, 2023 10:36 pm

Here's my 02 cents:
Envy = underinflatted
Zipp/SRAM = realistic
SILCA = marginally overiflated

OEM recommendation is ridiculosuly overinflated. I'm lookng at Continental, Goodyear, Michelin, Vittoria, Veloflex, etc.
Instead of printing maximum PSI they should provide average range. Save riders from crashes due to overinflation. It's very unlikiely that a rider will buy the same brand after a nasty experience of a blowout.

Well. other part of equation is tires.
ReneHerse is only asking for tire width and system (bike + rider). Does it mean I have to run same pressure for 28c on 17internal rims vs 25mm internal rims? Visually, latter are 2-3x more volume.
Another one is: SRAMs tire casing. How do I know what kind of casing is there? Corsa 2.0 TLR is lightweight or standart. Does Gp5k clincher and GP5k S TR have same casing? What about "durable" versions of leading tires, i.e. Corsa Control or GP5k AS TR.

His: Orbea Orca OMX
Hers: Cannondale Synapse HM Disc

Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓

www.starbike.com

In a recent podcast, Josh said the Silca number is a maximum. That would explain why it is a bit higher than the others.

Sram having a different number for hooked and hookless is convenient. Of course they give hookless a lower "optimal" pressure when their hookless wheels have a max pressure that will end up being below optimal on smoother surfaces.