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-   General Cycling Discussion (https://www.bikeforums.net/general-cycling-discussion/)
-   -   Tolerance for tire width? (https://www.bikeforums.net/general-cycling-discussion/1235366-tolerance-tire-width.html)

ofajen 07-25-21 06:38 PM
Originally Posted by 6StringJazzer (Post 22157426)
I am not plugged into cycling discussions so I'm unaware of this as a hot topic, or what people are saying. All I know is my own experience.
If you want to hear from people who have studied this for years and done research that is driving the newer thinking, this (five year old!) podcast really has a lot of good info. The featured experts are Jan Heine from Rene Herse and Josh Poertner who worked as technical director at Zipp for 15 years and now runs Silca.

https://cyclingtips.com/2016/08/cycl...and-pressures/

Otto

70sSanO 07-25-21 06:40 PM
Originally Posted by 6StringJazzer (Post 22157426)
The hot topic I follow is whether round-wound or flat-wound strings are better, and what scale to play on a half-diminished 7th chord.
Well then you know it doesn’t take much to be a hot forum topic… maple, rosewood, ebony board, humbucker vs. single coil, tube vs. digital, pedals vs multi fx, etc.

John

jayp410 07-25-21 11:10 PM
Originally Posted by 6StringJazzer (Post 22157426)
I decided to go with Continental Grand Prix 5000
Excellent choice... they are really good tires.

Badger6 07-26-21 02:48 AM
It is an excellent tire. But, depending on the rim profile, wait till he tries to mount them...

rumrunn6 07-28-21 12:52 PM
Originally Posted by cxwrench (Post 22156833)
No, you're not losing any pressure, that air is only coming from the hose, not your tire
hmmm, ok

genejockey 07-28-21 01:07 PM
Originally Posted by 6StringJazzer (Post 22156650)
Yes, I have found exactly what I want on the Internet if I want to wait a week for delivery. That's an option but I ride about three times a week and would prefer not to wait.
You need more bikes. ;)

genejockey 07-28-21 01:11 PM
Originally Posted by PeteHski (Post 22157219)
Back in the day when I was still running 23c tyres and you had to download websites to read them, I just ran them at 90 psi and that was a plenty harsh enough ride! Now I run 30c and 32c tubeless at around 60-70 psi. I weigh 175 lbs.

If you have clearance for 25c I would take those and experiment with lower pressure. Unless you weigh a lot more than me, 90 psi should be more than enough.
I'm 200# and I pump my 25s to 90F/95R. Big difference from the old 120 I used to use! Not just more comfort, but less 'hop' on rough patches on curves. And I don't find myself constantly seeking the smoothest part of the bike lane.

cxwrench 07-28-21 02:24 PM
Originally Posted by rumrunn6 (Post 22161457)
hmmm, ok
You don't believe me? You put the pump on a Presta valve and don't get a pressure reading, right? Because the pump head doesn't open the valve. On a Schrader valve the pump head opens the valve and you get a pressure reading as soon as you put the head on the vavle. When you pump up a presta valve the air from the pump pushes the valve open, air goes in. When you reach the bottom of the stroke/stop pumping the pressure in the tire is greater than in the pump and the valve closes under that greater pressure. Thus no air is lost.

rumrunn6 07-28-21 04:50 PM
Originally Posted by cxwrench (Post 22161605)
You don't believe me?
those are not my words. in fact I was accepting your answer, but still curious. I will run a test when I find my high pressure gauge. just realized my bike bag had a low pressure gauge cuz I've been riding my MTB a lot this past year. BTW all my bikes use Schrader valves

kahn 07-28-21 10:54 PM
Originally Posted by rumrunn6 (Post 22161812)
those are not my words. in fact I was accepting your answer, but still curious. I will run a test when I find my high pressure gauge. just realized my bike bag had a low pressure gauge cuz I've been riding my MTB a lot this past year. BTW all my bikes use Schrader valves
And years ago, I converted what Shrader's I had to Presta. It just made life simpler. A grommet was designed for that purpose.

rumrunn6 07-29-21 04:28 AM
Originally Posted by kahn (Post 22162211)
And years ago, I converted what Shrader's I had to Presta. It just made life simpler. A grommet was designed for that purpose.
hehe me too, just went the other way. a drill bit was designed for that ;-)

rumrunn6 07-30-21 11:15 AM
Originally Posted by cxwrench (Post 22161605)
air loss removing pump chuck w/ Schrader valve
bought a new Milton patented pencil style gauge 20-120 psi. pumped the road bike rear tire to 100psi, pencil gauge reads 98, not bad at all! pumped the front to 90psi pencil gauge reads 86, again not bad at all. when I use the pencil gauge I can hear/feel some air loss as well, so I don't usually measure the tires after initially pumping them. all in all, not losing as much as I thought. I think you are mostly right, most of the air I hear & feel is coming from the hose & I have a long hose. the pump is a craftsman. adapted an old hose & chuck that I liked from a previous pump. I find the Craftsman gauge to be reliable
https://cimg1.ibsrv.net/gimg/bikefor...89e65434fd.jpg

related, after pumping the bike 2 weeks ago, 2, 25 mile rides during that time, the tire pressures today were in the mid-70s. I guess it pays to pump them fresh, once a week maybe, if I'm using it regularly. not gonna pump it if I'm using the MTB of course


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