Tyre Pressures: GP 5000 vs Gatorskin Hardshell

[MudLark]

The Max Pressure printed on the sidewall is a warning and not a guideline. Just like the tyres on your car, do not inflate to the max pressure.

If you inflate to 110psi and then fly down Kloof Nek Road you will be way over 115psi. Hit the brakes, the rim gets hot, the air expands and now you're at 125psi. BOOM!

Yes. But the online store specs also set a lower limit. There must be a reason for that. And if you look at the Conti specs, they do vary with width. See also Diesel's note above.

 

BTW, don't think braking heats rims and tyres that much. Bigger effect driving at speed for long periods. Upper limit specs usually allow for this too.

Edited December 7, 2020 by MudLark

[cadenceblur]

I'm interested to hear what you guys are using to measure these pressures, I've found my Topeak digital gauge to under read by 20%(used digital gauge at petrol stations as a reference), and a Schwalbe as well, these could also be wrong!

[Patchelicious]

I'm interested to hear what you guys are using to measure these pressures, I've found my Topeak digital gauge to under read by 20%(used digital gauge at petrol stations as a reference), and a Schwalbe as well, these could also be wrong!

Thumb and forefinger ????????

[Andreas_187]

BTW, don't think braking heats rims and tyres that much.

For sure it does, maybe more than anything else. Touch the rim of your carbon or aluminium wheel after coming down Kloof Nek. It's hot which means the air inside the tyre is hot therfore expanded

[The Ouzo]

I'm interested to hear what you guys are using to measure these pressures, I've found my Topeak digital gauge to under read by 20%(used digital gauge at petrol stations as a reference), and a Schwalbe as well, these could also be wrong!

NEVER trust the gauge at a fuel station

[MudLark]

For sure it does, maybe more than anything else. Touch the rim of your carbon or aluminium wheel after coming down Kloof Nek. It's hot which means the air inside the tyre is hot therfore expanded

Don't feel any temperature change at all on the rim. Must be the disc brakes I guess... ;-)

 

Sorry, I was referring to car wheels and tyres. Now reading again I see you're talking about rim brake bicycles.

[MudLark]

NEVER trust the gauge at a fuel station

Yup. Carry my own gauges in the car for that very reason. Edited December 8, 2020 by MudLark

[cadenceblur]

Also have own gauge but one needs a reference? The newer digital gauges at some stations appear be a good option. In fact, I only check my car pressures at stations with those.

[DieselnDust]

For sure it does, maybe more than anything else. Touch the rim of your carbon or aluminium wheel after coming down Kloof Nek. It's hot which means the air inside the tyre is hot therfore expanded

 

If you can touch it its not hot enough to raise the tyre pressure significantly

[DieselnDust]

NEVER trust the gauge at a fuel station

 

Most reputable service stations have their gauges calibrated monthly so they're probably more accurate than the gauge on your bicycle pump. 

[Patchelicious]

NEVER trust the gauge at a fuel station

 

Are there still people who use Schrader valves on bicycles?