Conti 5000 tire pressure
 

I just bought these tires (700 X 25C). I wanted these tires to increase my speed for race day due to reduced tire resistance, as advertised, and the tire's popularity. I know it won't make a very large difference, but more speed is still better than less speed given the same degree of wattage I can produce. Based on your experience or knowledge, what tire pressure front and back will optimize milaegage improvement (whatever it may be)?

Google 15% drop pressure, consult chart. Adjust to taste.

Then go ride the tires and adjust the pressure as necessary after some test rides nrsmd. The outputs are not perfect, but without a lot of fuss will get you very close to a useful pressure from which to start experimenting with the right pressure.

Also, invest in a decent standa lone pressure gauge to make sure you have the pressure where you want it...pump gauges are not reliable. They're good for getting in the ballpark, but are not reliably precise.

Bike pump recommendation that you found could get pressure up to120 or so?

You haven't posted your weight, no way anyone can advise. And don't think you're going to go faster at 120 than a lower pressure no matter how much you weigh.
As an example...I weigh about 160 and would run 85rr/75frt w/ 25mm tires. Especially Contis as they tend to be a little wider than stated size.

Even the 5000s?

Slightly but not much.

26 mm vs 25 mm nominal

If you're going to deviate anyway from what the calculator tells you, the accuracy of your pump doesn't matter too much, as long as your pump is consistent in its inaccuracy.

True, however, there are a couple of reasons an accurate pressure gauge are helpful, in my experience.

1) You need to start somewhere.
2) once you know what works fro a given surface with a given tire, it's helpful to know what the actual pressure is, so that you can replicate it without another round of trial and error.

Unless you weigh a metric ton, I'd be shocked if the recommended pressure was much north of 90. I weigh about 180, ride 27s (that measure 27) and my recommended pressure is 76, but I run them closer to 70. Like cxwrench said, there is no possible way to offer a guess at the recommended pressure without knowing the combined weight of the bike and you.

To get the same feel of suppleness (as my Veloflex and Vittoria 25mm) on the 5000s, I have to reduce the pressure from my usual ~100 psi to about 85, thereby increasing the rolling resistance for me. Rider weight =190lbs.

In my opinion, the Conti 5000 may have slightly lower rolling resistance at equal tire pressure and (reportedly) good durability, but has a stiffer the ride quality than the comparable price competitors. If it proves out more durable in my riding conditions, that is a reasonable trade-off.

I ride my 28s @ 60psi rear 54psi front. Great ride at those pressures for that width.