One of the defining characteristics of SILCA throughout our 100-year history has been the continuous search for innovations and improvements to our products, down to the smallest of details that go into them. Our modern line-up of pumps for example pay homage to their original designs (some of them dating back more than 75 years) yet are built using modern engineering practices, materials and standards. Yet through all of the innovations and changes we’ve gone through as a brand, there are some things that will never change. A great example of this is our use of the leather washer inside of all of our pumps since 1917.
General Thought
As something that is typically used before every ride; durability, efficiency and overall experience are key design goals of all of our pumps. An accurate gauge, quality chuck and stable base go a long way towards achieving these goals yet the internal components of the pump are by far the biggest determining factor in regards to overall performance. It is the internal components after all, that work together to create the seal, which then builds pressure inside the barrel that ultimately ends up inside your tires. Overall performance then depends heavily on this internal system and we’ve yet to find anything more durable, consistent, efficient or pleasurable to use than full grain leather.
Durability
The biggest issue with most pumps is that they just don’t last long before they begin to not perform as well as they did when they were new or they break completely. In most cases, the issue is that there’s no longer a proper seal within the barrel to push the air through the system and into the tire. The most common system used to create the seal is a rubber O-ring on the end of the piston. Pressure is created by the O-ring making contact with the inner walls of barrel, which then pushes air through the system as the rider moves the handle up and down.


The issue with O-rings is that most aren’t designed to deal with the friction, heat and airborne contamination experienced within a bike pump. Unlike a suspension fork or shock which uses o-rings completely sealed and bathed in oil, the pump inhales air and all of its contaminates with each stroke. It only takes a single particle of grit or sand to enter the pump to begin damaging the O-ring. Once the O-ring develops a nick or tear, then the seal becomes less effective and therefore is no longer able to push the same amount of air. Over time, the exposure to heat and pressure will cause nicks and tears in the O-ring to grow and ultimately fail the ring.
Our leather washers on the other hand are extremely durable. Formed using steam and pressure, each gasket is a full 3 mm thick, which makes them resistant to fatigue and damage. Each gasket is hand cut and formed by the same vendor in Milan, Italy who specializes in producing high end luggage. Since 1947, our supplier has cut SILCA washers from the off-cuts of luggage production, allowing us to provide washers made from some of the most exclusive, expensive, and durable leathers, while also saving these materials from the landfill. The end result of this has been a legacy of obsession by Professional Mechanics. Every year, we hear stories from our professional mechanics about how much sand and dirt ended up in the barrel at races like the Tour of Qatar or some of the Spring Classics yet the pumps performed flawlessly. It’s stories like these, along with a century of use, that give us extreme confidence in the leather washer’s ability to keep your pump performing flawlessly for decades.
Pumping Efficiency and High Pressures
Another common complaint with a lot of pumps has to do with pumping efficiency and the inability to reach high pressures as the pump ages. Again, this issue is most often traced back to the use of a rubber O-ring to create the seal.

You may not realize it, but there’s quite a bit of heat being generated inside of a bicycle pump as a result of the compressing air to high pressures. As the temperature increases, the diameter of the barrel will inevitably increase (ever so slightly) as well. The problem with a plastic or rubber O-ring in this situation is that it doesn’t expand in diameter with the pump barrel so there’s going to be slight gap between the two and therefore a loss of efficiency.
The leather cup washer on the other hand is pushed outward against the tube wall by the air pressure beneath it. This makes the system 'self compensating' and the leather could easily grow up to 5mm diameter if it needed to, so the fraction of a millimeter of tube growth goes relatively unnoticed by the leather seal.
Experience
Cycling is about recognizing those little nuances that form together to create this beautiful mosaic of emotions that we all refer to as ‘the cycling experience’. The sound of a perfectly tuned drivetrain, the euphoria of reaching a summit, the feeling you get atop a perfectly balanced bike to name a few. Can inflating your tires before the ride be synonymous with these experiences? We say it can.

Simply put, we’ve tested out a lot of different alternatives and nothing comes close to the experience you get when using a pump with the leather cup washer. On multiple occasions, we’ve set up a blind experiment where we have pumps with the leather washer and ones without and asked people to choose which one they like better. In three years of conducting that experiment with hundreds of participants, we’ve never had anybody choose the pump that didn’t contain the leather washer.

The leather washer feels better because of how it interacts with the lubricant on the inside of the barrel. Rather than just push the lubricant around like an O-ring does, the full grain leather washer absorbs the lubricant, which not only reduces friction more effectively but it also lasts a lot longer. Before the leather washers are installed into our pumps, they’re pre-soaked in a special NFS lubricant for a few days to saturate the leather. After that, every stroke of the pump allows the leather to lubricate the tube walls as it slides along. With a few drops of lubricant dripped into the pump every year, the leather washer will perform flawlessly for decades.

History
Leather cup washers were used in the first pumps that SILCA produced in 1917 and are still used in all of our floor pumps and frame pumps today. Since the 1960’s we’ve used the same supplier in Milan, Italy who cuts them from the excess material left over from the production of high end luggage, hand bags and luxury Italian cars. All SILCA leathers are produced from the highest durability materials available, using off-cuts and remnants which would otherwise be discarded.

October 05, 2017 8 Comments


8 Responses

Chris
Chris

July 11, 2018

Honestly, with your outrageous pricing I am surprised that you didn’t charge me to post this comment.

Just kidding. Hope it made you and the team laugh. Keep up the great work and look forward to buying this heirloom soon.

Bruce
Bruce

March 03, 2018

My Super Pista has been in use 3-4x/week for almost 25 years without a single issue. A few drops of Mobil-1 every year or so is nothing for maintenance – still on the original washer. Even did several school Bike Day events tuning up countless bikes. Every time I use it I feel a connection to the history of cycling – like a glimpse into the Tour in the 1950s… Real Columbus frame tubing, sweat-stained wood handle; it’s just nice to handle and admire. It feels solid and timeless, like a classic steel frame bike. My Silca pump gives me pride, satisfaction and charges me with a bit of cycling soul before every ride!

Mark Westray
Mark Westray

October 10, 2017

I also have a 40-year old Pista pump, Columbus tubing painted Moultini orange, though now pretty nicked up (looks exactly like the picture in your replacement parts page: https://silca.cc/collections/replacement-parts). I’ve replaced the leather gasket 2-3 times, replaced the original hose ~20 years ago with a hydraulic hose purchased from an auto parts store, and recently replaced the gauge and presta chuck gasket. Works perfectly and I use it before every ride. If the humble tire pump could have a soul, this one most certainly does!

Scott Hemmenway
Scott Hemmenway

October 06, 2017

I’ve had my Pista floor pump for 42 years and only replaced the leather once, and that was not because it was failing, but just because I lost faith in it and figured it must be worn out.

Neil Winkelmann
Neil Winkelmann

October 05, 2017

Yeah, I dunno. An o-ring pump that I bought to replace my Pista 12 years ago (when I couldn’t find a leather washer for sale anywhere) has never failed me and has required absolutely no maintenance. It works better as well, pumping both faster and easier, and has a bigger gauge that is easier to read. The handle is more comfortable and the base more stable. I think it’s a better pump in every way. But not as cool. I stopped bothering to try to find a leather washer.

MAG
MAG

October 05, 2017

My Silca pump has been in operation for at least 25 years

Grammar Police
Grammar Police

October 05, 2017

“Unlike a suspension fork or shock which uses o-rings completely sealed and bathed in oil, the pump inhales air and all of it’s contaminates with each stroke. " should read:
Unlike a suspension fork or shock which uses o-rings completely sealed and bathed in oil, the pump inhales air and all of its contaminants with each stroke. No apostrophe needed with its unless it is a contraction for “it is.”

Terry Roark
Terry Roark

October 05, 2017

I bought a used Pista floor pump, the seller said it was not working, I replaced the leather washer and the guage, works like new.

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