3alarmer 

I should have remembered that in the forums, you always
need to ask more questions before you answer.

What, exactly are you doing ? Do you have twenty five
bikes that you need to pump both tires on daily ?

Is this a bike rental business ?

I know very few shops that do 50 tires a day, but
there are a couple. Are you simply topping off 25
bikes daily ? Are they skinny HP tires or higher volume
low pressure tires ?

What floor pump are you using ? Is it a reasonably
good quality one in good working condition?

Here is what I'm using as a compressor right now


Hitachi EC12 Portable Electric Air Compressor #EC12

Oil lubed pump, portable, pretty durable and a good warranty.

Noisy as all get out...... Not sure of the max pressure you can
set it for, it's designed mainly for construction use to run nailers,
staplers, etc on the job site.

What you've already been told applies......quiet = larger, belt driven unit
but also costs more and takes up more space.

Even though I have the compressor and over 30 bikes, I still use
a good quality floor pump 95% of the time.

sknhgy 

Even if a pancake compressor is loud, can't you put it in a closet or under a box or something. It shouldn't overheat.

bobn

Harbor Freight has a 3 gal pancake comp 100 psi for $40. Regularly $80.
Quite frankly, no sarcasm or criticism intended, before I would hand pump all those tires I would learn to deal with the noise of a compressor.
You could put the compressor anywhere you want and just use a longer hose. My air hose is 100' long. You can make it as long as you want to hide the comp and the noise.

3alarmer 

Sissy......................

And yeah, you're right about the long hose, hide the comp business.

A lot of my larger compressors have been in another room from
where the work goes on.

bobn

Sissy? NAH. I got one of those manly 4 HP jobs!

ratdog

On a more serious note if you have the patience, here is some reading which should help you decide. I would personally go with an oil lubricated, belt driven 2 stage if you have the money. The larger the tank size the better since the less it runs the longer it'll last.

Some things to keep in mind, belt drive is quieter, oil lube needs to be level when operating, 2 stage gives much more capacity and higher psi and make sure you can drain it easily otherwise it'll collect water in the tank over time.

https://www.aircompressorsdirect.com/...ompressor.html

bobn

Now you are getting into the more expensive big stuff. May be overkill for bike tires.
We don't know what his electrical power supply is. My 4 hp has a dedicated 20 amp 110v line to power it. It draws when starting under load.
He needs something small and simple with some storage capacity. Bike tires don't have that much volume.
Also, for a oil piston compressor you will need a separator attached to the outlet to catch any oil vapors that get produced.

DMF 

Okay, let's back up here. There are a lot of tangential comments, but no one has said what the operating requirements are.

Is the compressor tank going to be pressurized constantly, or asked to deliver on demand? How much time do you have?

* There are two ways to get the pressure needed: 1) have the storage tank constantly pressurized above your demand maximum, or 2) wait for the compressor to produce the volume/pressure needed. (High operating pressure effectively increases the storage capacity of the tank without increasing the tank size.) Constant high pressure units tend to be expensive. The cheap ones can produce the pressure needed - given time. Sometime a lot of time. For quick response - to my mind the true justification for using a compressor for bike tires - you need the former.

Is the installation permanent, or do you want to be able to pick it up and walk off?

* If you want it portable, look for a 120VAC pancake style. The Hitachi pictured above is on the margin. Assuming it uses a high operating pressure, it can keep up with most requirements and can be carried. (My 135psi Proter-Cable is wheeled and moved like a small wheelbarrow. Not hand portable, but a good compromise.)

Are 120 psi tires the only target, or do you want to power air tools also?

* Most air tools require 90 psi and don't like the high pressure you want for bike tires. A high operating pressure is good for air tools too, but you'll need a separate regulator to step down the pressure.

bobn

You may also want to take a look at inflators. If all you want to do is pump up bike tires this may be the way to go.
Check out Sears Craftsman model 75118. It is light, small, portable, pumps to 125 psi and runs about $90.00

bobn

Amazon has that model right now for $55.00