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From: Mark J cleary <mcleary08@comcast.net>
Newsgroups: rec.bicycles.tech
Subject: Re: fast tires
Date: Thu, 12 Jun 2025 17:49:01 -0500
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On 6/12/2025 4:14 PM, Roger Merriman wrote:
> Frank Krygowski <frkrygow@sbcglobal.net> wrote:
>> On 6/12/2025 2:32 PM, Zen Cycle wrote:
>>>
>>> It sounds as if you're running the 32s somewhat underinflated. Put
>>> another 10 PSI in and see what you think.
>>
>> Experimenting with tire pressure sounds interesting, and would be a lot
>> easier than comparing different sizes and brands of tires.
>>
>> But I'm skeptical of anyone's ability to "feel" the probably minor
>> differences that would result from five or ten psi upward or downward.
> 
> 10 psi is definitely very obvious certainly by gravel bike terms let alone
> MTB! I started at 60psi realised it was rather too high 50 psi is
> noticeable difference and indeed 45psi that I run now, with the difference
> being it’s now tubeless vs tubes, if I’ve had a puncture and had to top up
> a tyre I’m well aware that I’m a bit lower than normal and can feel it.
> 
> Likewise on the MTB 10 psi or even 5psi is quite a difference, if your
> running 20/30psi.
> 
> If your running higher pressure and/or using touring type tyres the
> differences will be less. Due to sidewalls and all that.
>>
>> I think the most practical way of detecting a difference would be to use
>> a road with a consistent, slight downward slope. Coast down it
>> repeatedly with different air pressure and note speeds. Try for days
>> with no wind and consistent temperatures if possible.
>>
>> And keep in mind that if the difference is difficult to detect that way,
>> it probably doesn't matter for most riding.
>>
>>
> Certainly off road it’s a common green gravel folks mistake, aka running
> tyre pressures 10 psi over what they need and pinging about the place!
> 
> Roger Merriman
> 
> 

I actually like a bit more pressure in the tires than some. I hate the 
feeling of the tire bottoming out or I go over bump and can feel the 
tire give a lot. It makes me uneasy and I always get the feeling I might 
be having a flat. When I go in drive way ending ride I have small drive 
way bump and that tells me things. If the tires is flexing more than I 
like I know it i air time.

-- 
Deacon Mark