Rene Hearse Tire Pressure Calculator

5 replies · 598 views

ljsmith
762 posts
#1Mar 22, 2022, 1:15 PM
Rene Hearse just released a tire pressure calculator. Based on the numbers I get out of it, the values seem a little high. I would guess they are based on the super thin sidwalls of their Extralight tires which probably need more pressure than "normal" tires.

https://www.renehersecycles.com/tire-pressure-calculator/
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kevw77
2 posts
#2Mar 22, 2022, 5:15 PM
You might like Silca's tire pressure calculator. You can choose a surface and wheel diameter:

https://silca.cc/pages/sppc-form
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stu
646 posts
#3Mar 22, 2022, 6:47 PM
ljsmith wrote:Rene Hearse just released a tire pressure calculator. Based on the numbers I get out of it, the values seem a little high. I would guess they are based on the super thin sidwalls of their Extralight tires which probably need more pressure than "normal" tires.
Thanks for posting that.

I've run my SP Endurance around 35 psi, between the calculated low and high values (33 and 40 psi for my weight). I wouldn't chance going under the low value and don't see any need to go over the high value. RH says the tires will be a little slower between their low and high values though I'm sure that depends on the surface.

kevw77 wrote:You might like Silca's tire pressure calculator. You can choose a surface and wheel diameter:
IMHO the Silca calculator is best because it gives you many choices (with pictures) of surface conditions.
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Dino Sore
27 posts
#4Mar 24, 2022, 6:25 AM
I use both the Silca (above) and SRAM calculators as a starting point. Then I do a "thumb" test to see what the tire feels like, then I ride up and down the street to see what the sidewall deflection looks like. Then I see how a certain pressure feels on a ride. The pressures I eventually end up at are always lower than any of these two calculators (and I am not the skinniest rider).

https://axs.sram.com/guides/tire/pressure
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Mark_S
144 posts
#5Mar 25, 2022, 3:40 AM
I just tried all three. The Silca and SRAM calculators gave something a bit above the RH soft value. Despite it's simplicity, the RH tool gave pretty much exactly what I use for softer/harder, depending upon what I'll be riding.
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nalax
84 posts
#6Mar 25, 2022, 7:44 PM
Mark_S wrote:I just tried all three. The Silca and SRAM calculators gave something a bit above the RH soft value. Despite it's simplicity, the RH tool gave pretty much exactly what I use for softer/harder, depending upon what I'll be riding.

I got the same result as you. IMO all three calculators are good to use, with the Silca offering up more road conditions.
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