Tyre pressure road bike
Moderator: robbosmans
Hello there,
I always used 100 psi on my wheels, when I used 23mm and 25mm as wel.
But I read on the internet that when using 25mm tires one should lower it and even when the rim is wider like 21mm inner I could lower it even more being someone like me weighing 72 kilos it could reach use 70psi.
Do you guys ride lowering the PSIs on your road bikes that much?
Is there any note of how much they use for example the worldtour?
For example this is the psi chart from LB https://www.lightbicycle.com/support/us ... &content=4
its insane 75psi.
Could you share your experience with me?
I always used 100 psi on my wheels, when I used 23mm and 25mm as wel.
But I read on the internet that when using 25mm tires one should lower it and even when the rim is wider like 21mm inner I could lower it even more being someone like me weighing 72 kilos it could reach use 70psi.
Do you guys ride lowering the PSIs on your road bikes that much?
Is there any note of how much they use for example the worldtour?
For example this is the psi chart from LB https://www.lightbicycle.com/support/us ... &content=4
its insane 75psi.
Could you share your experience with me?
Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓
www.starbike.com
My data point: 64kg rider using
25c tire on 23mm internal width rim on the front,
28c tire on 25mm internal width rim on the rear,
I use 58psi on both wheels. Yes, 25c tire using 58psi. That's not a mistake. It's not really squishy either, wide rim really works.
25c tire on 23mm internal width rim on the front,
28c tire on 25mm internal width rim on the rear,
I use 58psi on both wheels. Yes, 25c tire using 58psi. That's not a mistake. It's not really squishy either, wide rim really works.
-
- Posts: 203
- Joined: Sat Nov 16, 2019 10:10 am
- Location: Germany
My setup:Hexsense wrote: ↑Wed Sep 22, 2021 1:10 amMy data point: 64kg rider using
25c tire on 23mm internal width rim on the front,
28c tire on 25mm internal width rim on the rear,
I use 58psi on both wheels. Yes, 25c tire using 58psi. That's not a mistake. It's not really squishy either, wide rim really works.
Wheelset: Roval CLX 50 (21mm internal width)
Tires: Continental GP 5000 tube-type, 28mm (measures 29.8mm on above rims), front & rear.
Tube: Vittoria Latex
Frame: Tarmac SL6
At 65 kg, I run 48 PSI front and rear.
Road conditions far from pristine.
No flats, no tires coming off, hassle-free all around and most importantly: very fast & comfortable.
With 100 PSI on 23mm tire, I would never ride the bike. I would hate how the ride beats me up.
2020 S-Works Tarmac SL6 Disc @ 6.35-ish kg: viewtopic.php?f=10&t=159454
2021 Specialized Diverge viewtopic.php?f=10&t=165482
2021 Specialized Diverge viewtopic.php?f=10&t=165482
-
- Posts: 780
- Joined: Thu May 07, 2015 9:18 pm
bobones wrote: ↑Wed Sep 22, 2021 6:30 amSilca Pro Pressure Calculator is a good one. Note it uses measured tire width, not sidewall label.
https://silca.cc/pages/sppc-form
This real tire width apply on Zipp calculator too?ghostinthemachine wrote: ↑Wed Sep 22, 2021 9:38 aman important point. My largest road tires are 4 mm wider than the label when fitted, which makes about 1 bar difference in recommended pressures.
The SRAM / ZIPP calculator is much better than the Silca one. Takes rim ID into account which has a huge part to play in tyre pressures.
SL8 S-Works Project Black - 6.29kg
IG: RhinosWorkshop
IG: RhinosWorkshop
No it doesn't. Lets not get cofused with pressure and volume here.
A narrow rim with wide tyre and a wide rim with the same width tyre can have an almost identical tyre width, but the tyre profile is very different (lightbulb vs flat sidewalls).
The volume of the tyre shall always be identical since it is a 2D object, but the rim volume is much smaller on a narrow wheel, so the total system volume shall differ.
Greater volume = lower pressure, Boyle's Law and all that.
SL8 S-Works Project Black - 6.29kg
IG: RhinosWorkshop
IG: RhinosWorkshop
I've been told that some people can tell the difference between thinner and thicker butyl tubes or latex and rims that are 2mm wider. Supposedly the reason I can't tell the difference is that I run too high pressures or crap tires or something. Honestly I can only just tell the difference between tubeless and tubed road tires, therefore those people have over-active imaginations IMO.
There is no prefect psi for your weight it depends on road surface. Same rider tires and wheels you'd match the pressure to the road - super smooth bitumen roads, run high pressures like 100psi. Rough roads like Paris-Roubaix much lower maybe 50-60psi, DH MTB 20-30psi. These calculators seem like nonsense to me unless you are simply running them on a 'super-smooth bitumen at all times' algorithm.
Of course rider weight does come into the equation, but it's a percentage less for lighter riders plus bike after accounting for road surface.
There is no prefect psi for your weight it depends on road surface. Same rider tires and wheels you'd match the pressure to the road - super smooth bitumen roads, run high pressures like 100psi. Rough roads like Paris-Roubaix much lower maybe 50-60psi, DH MTB 20-30psi. These calculators seem like nonsense to me unless you are simply running them on a 'super-smooth bitumen at all times' algorithm.
Of course rider weight does come into the equation, but it's a percentage less for lighter riders plus bike after accounting for road surface.
Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓
www.starbike.com