Don't forget this equation can be represented as s-1=ideal no. of bikes. S being the number of bikes it will take for a separation or serious discussion with spouse.N+1 is fucking awesome. It means no matter what the conditions were/are you've always got something to ride. It means that your parts last 4x as long since you don't ride it all the time too. The only shit part of N+1 is when there's 2 people who have "his and hers" of everything. Makes storage annoying.
I use an air filled T&E tools gauge (0-40), you can observe the small loss of tyre pressure upon reconnecting pretty clearly as the psi increments are 5mm apart, on the Schraeder it's about .2psi for one connection and removal of the gauge. It took 5 connections to drop 1psi when I checked it (5 on, 5 off). I spose may have something to do with the quality of the connection, but it seemed pretty common clip blade type attachment.Have you ever used one of these? I find with a schraeder valve that the pressure measurement can vary by quite a bit depending on the pressure you apply with your thumb/hand to make the gauge seal on the valve. Just wondering if any of these gauges screw on to the valve to remove this variable?
Ideal for my tyre pressure setting process with a schraeder valve would be
1. Pump up tyre to above the desired pressure
2. Screw on gauge
3. Bleed to desired pressure
4. Remove gauge
Don't seem to have this issue with presta valves. The variability seems to be removed because the gauge gets pushed down to the hilt on these valves.
Yeah, it's not the little squirt of air lost when putting the gauge on and off I'm worried about. I use a digital topeak gauge. I need to push down on the valve with a bit of pressure to get a proper seal for the gauge. When doing this the pressure values go all over the place. I can see why they do. The pressure I'm applying pushes the valve stem into the tube which is displacing air. This pushes the air pressure up. If the valve was screwed on I would not need to apply the pressure to the stem to get a seal and everything would be much more constant.I'm sure a scientist here will be able to model the flow, my simple understanding was the noise you hear is mostly the volume change in the device (gauge or pump) when filling up or exiting the device as the check valve at the wheel engages faster and is mostly in the device when it free flows. Therefore most pressure loss is on connection, not removal.
Does anyone check their hot pressures?? jk.
Edit: I think you're onto something with the threaded attachment. For the application these things are made it's usually to take a measurement in the fastest possible time. I guess you could ask them, or add one yourself?
Specialized tubes are threaded all the way, bought one by accident a long time ago and only installed it just a couple of days ago.Yeah, it's not the little squirt of air lost when putting the gauge on and off I'm worried about. I use a digital topeak gauge. I need to push down on the valve with a bit of pressure to get a proper seal for the gauge. When doing this the pressure values go all over the place. I can see why they do. The pressure I'm applying pushes the valve stem into the tube which is displacing air. This pushes the air pressure up. If the valve was screwed on I would not need to apply the pressure to the stem to get a seal and everything would be much more constant.
I'm not not having this issue with the presta valves because the screw at the bottom of the stem stops the stem being pressed into the tube. This stops that air being displaced.
I've only got one bike running schraeder valves so it's not a huge deal.
I guess you're right. I might have to rig something up myself. Other option might be to go tubeless on this bike if the tubeless schraeder valves have the nut at the bottom of the stem.
Sorry for the thread derail.
Looks like some Schwalbe tubes might be fully threaded. Never used them though.
Thanks for the tips. I will look for some fully threaded schraeder tubes.Specialized tubes are threaded all the way, bought one by accident a long time ago and only installed it just a couple of days ago.
My ol' man is a bit of a freak with his car and caravan tyre pressures so I got him a decent gauge and it works really well and the gauge only goes to 60Psi so it's easy to get your pressures exact.
Like this-
View attachment 326154
It's branded as a speedwaymotors.com(US store) product but is just a bunch of bits put together, USG gauge, bleeder, bit of hose and a stock chuck on the end.Thanks for the tips. I will look for some fully threaded schraeder tubes.
SB - can you remember what the gauge is? Does is have a bleed valve?