Tubes--And No Tubulars

 Tubeless tires have been one of the most-ballyhooed developments in cycling during the past few years.  I have not used any myself, but I can see the appeal for certain kinds of riding, particularly off-road:  Tires ridden at low pressures are more prone to "pinch" flats than to punctures.  

The debate over whether tubeless tires will displace their more traditional counterparts reminds me of the argument I heard when I first became a dedicated cyclist:  tubulars vs. clinchers.

My first "serious" bike, a Peugeot PX-10, came with tubular tires.  Their casings wrapped around the tube and were sewn together (hence the nickname, "sew-ups).  They were then attached with a cement with the consistency of applesauce (until it dried) to a rim with a crescent-shaped surface.

The fully-enclosed tube made for a more buoyant (not for nothing do the French call these tires "pneus boyeaux") and lively ride.  They also were lighter than any clinchers available at the time, which accentuated their performance advantage over "clinchers," the tires 99 percent of us ride.

Clincher (top) and tubular tire.

Tubed (left) and tubeless clincher tires

Getting a flat on any tire is not fun, but fixing one on a tubular is an ordeal.  We usually carried a spare with us and, if we flatted, we changed the tire, letting the cement dry to about the consistency of bubble gum.  Then we'd cross our fingers for the ride home. Professional racing teams are trailed by cars, which usually carried spare wheels with tires glued solidly onto them.

That is why, for my first tour-- which I did on the PX-10--I had a set of clincher wheels built.  In those days, some riders toured (with loaded panniers!) on tubulars, but I was not going to do any such thing, especially when I ventured into the countryside of a foreign land.  Those wheels--my first custom-built set--and tires, together, weighed about two kilograms (a pound and a quarter) more than the tubulars, even though they were among the lightest of their kind available.  The tires were less prone to flats and much easier to fix.

Over time, companies like Michelin, Continental, Panaracer and IRC developed lighter clincher tires with improved durability, and Mavic created  rims--the "E" series--that adapted the weight-to-strength ratio of tubular rims to clinchers and added a "hook" bead that made it possible to use high-pressure folding clincher tires.  (Any rim made today with even a pretense of quality, in whatever diameter or width, is based on the “E” rims’ design.) Thus, the gap in speed and road feel between tubulars and clinchers narrowed to the point to the point that whatever benefits tubulars offered no longer offset their fragility, at least for most riders.

After my brief foray into racing, I kept one set of tubular wheels for fast rides.  But, as I developed other ineterests (and relationships), I decided that I'd rather spend my time riding than fixing flats.  Also, tire-making companies were offering fewer options in tubulars, or stopped offering them altogether.  So, about twenty years ago, I rode tubulars for the last time.  I'd own my last set of such wheels and tires, briefly, when I bought "Zebbie," my 1984 Mercian King of Mercia, just over a year ago.  Hal Ruzal built me a nice set of clinchers (with classic Campagnolo hubs and Mavic Open Pro rims) and I sold the tubulars that came with "Zebbie" about a month after she came into my life.

I mention all of this to provide context for a story I came across yesterday.  It seems that the tubular vs. clincher, and not the tubeless vs. tubed, question has once again reared its head.

For the 2021 racing season (assuming, of course, there is one), both of Specialized Bike's  World Tour men's teams--Bora Hansgrohe and Deceuninck-Quick Step--have committed to abandoning tubulars for all races except the early-season classics.  Both teams plan, eventually, to get away from sew-ups altogether.

Roval Rapide CLX wheel

What might surprise some people, though, is that they are not casting their lot with tubeless tires.  While both teams used tubeless, as well as tubular, wheels and wheelsets during the shortened 2020 season, their decision to go with clinchers might have been inspired by Julian Alaphilippe's Tour de France stage win on them.  Also, Roval, the wheel-maker of choice for many in the peloton, is making two of its lightest road wheelsets for use only with tubed clincher tires. "When it's possible to create tubeless wheel/tyre systems that outperform tube-type clincher systems, that's what we'll recommend to riders," read a statement from the company that, for the past couple of years, looked ready to go all-in on tubeless clincher tires.

So, for the time being, some of today's young racers on high-tech carbon-fiber bikes have returned to the choice many of us made two or three decades ago:  clincher tires.  With inner tubes.

Without Air Or Tubes, In 3D.

Three years ago, "The Retrogrouch" wrote about one of the most interesting and enigmatic companies in the cycling world.

Zeus probably came as close as any bike manufacturer to crafting all of the parts for its bicycles.  Of course, they didn't draw the frame tubes, which were usually Durifort, Vitus or Reynolds.  But they, or one of their subsidiaries did  make all of the other major parts, except for the tires.  But you could still ride Zeus tires on your Zeus bike.  How's that?, you ask.

Well, there was a company in the US called Zeus that made them. But they weren't the kind of rubber someone riding a Reynolds 531 frame with Zeus 2000 components would have wanted.  The appeal of that tire, the Zeus LCM, was found more among novice commuters and folks who didn't want to get their hands dirty or scratch their just-enameled nails. (I can understand that!)

Those tires were airless and didn't go flat because they were solid polyurethane rubber.  I tried them for a half-century and a few days of commuting. I wondered whether I had just experienced what it was like to ride a "boneshaker"!  

As so often happens when a new product comes to market, people think the idea is new when, of course, it isn't.  And when it disappears, it will probably return and have another generation of consumers believing they've just witnessed the most wondrous innovation.

Well, it turns out that the airless tire has been revived during the past few years.  Three and a half years ago, The Retrogrouch wrote about a new crop of such rim coverings. They were not solid, like the Zeus, but like other offerings that preceded them, they had solid inner tube-like inserts.  

Now a German startup company, ProFLEX, has created its own version.  This one does not have an insert but, unlike the Zeus, it is not solid rubber.  Instead, it is supported by a complex honeycomb-like structure inspired by a car tire Michelin introduced last year.  That network mimics alveolar structures like the air sacs of lungs:  solid on the inside and more flexible on the outside.  

(Or, since we're talking about Michelin here, we could say it's the inverse of a baguette, which is crunchy on the outside and chewy on the inside.)

The ProFLEX has one more thing in common with the Michelin tire:  It is 3D printed.

ProFLEX tire

Although I am not sure I would switch over to such tires, I would be curious to try them. I wonder whether their ride is more akin to that of pneumatic tires (most likely heavy ones) or solid tires like Zeus.

None of these airless tires, by the way, should be confused with tubeless tires, which are filled with air and can therefore be flatted.  I know:  Bill and I stopped to help a fellow who'd just been sidelined with his tubeless tires.  

Letting The Air Out

Tubeless tires for bicycles have been available for about two decades.  I have never used them myself, but I understand how they are useful for some riders, particularly mountain bikers.  While most road cyclists' flats are the result of punctures from road debris, mountain bikers are more likely to incur pinch flats that result from riding tires at low pressures, which causes the tube to be squeezed between the ground and the rim. If I were to become an active mountain bike rider again, I just might try tubeless tires.

I once tried another product created with the aim of preventing flat tires. 

Imagine a (say, 27 inch or 700C) donut made from the kind of rubber used to make tire casings.  That "donut" is solid; it does not have a hollow core into which air can be pumped, let alone one that can accommodate a tube. 

As you can imagine, installing such a tire was not easy:  It didn't even have the "stretch" of a tight-fitting tubed tire with a particularly stiff bead.  (I thought it was difficult to put those old Specialized Turbo tires on Weinmann concave rims until I tried installing one of the solid tires I mentioned!)  Removing it wasn't easy, either. 

That tire--the Zeus LCM--was available for a few years from the late 1970's to the mid-1980's.  Frank, the proprietor of Highland Park (NJ) Cyclery, stocked a few only because a few customers wanted them.  He also kept a pair of wheels fitted with those tires so would-be customers could try them before committing.  During the time I was working at HPC, he allowed me to borrow them for a few of rides.

If I thought those tires were hard in my hands, they were even harder on the road. They felt like they were made of cement!  Believe it or not, I actually did a half-century, in addition to riding to and from work for a few days, on them.  Never before had I ridden so slowly and felt so banged-up after riding:  The Zeus tires lacked the buoyance of pneumatic tires.  I found myself wondering whether I had just experienced what riding on a "boneshaker" must have felt like!


By the way, those Zeus tires were made in the US and bore no relationship to the Basque/Spanish bicycle and bicycle component manufacturer. Ironically, the only items on Zeus bikes that weren't made by the company were--you guessed it--the tires (and, in the case of clinchers, tubes). 

Around the same time those Zeus tires were on the market, a few similar products were being made.  Also, at least one other company made and marketed a solid foam inner tube, and another made a closed-cell foam inner tube with a hollow core which, as Retrogrouch pointed out, was like a big elastomer.  They were even heavier, slower and harsher-riding than the Zeus donuts.

Those products apparently disappeared around the mid-to-late 1980s.  

Sometimes it seems that if an idea is silly, impractical or bad enough, its time will come, or come again.  (That could make Victor Hugo turn in his grave!)   So, would you be surprised to find out that someone is making closed-cell foam tire inserts  again?  For me, the only surprise is that one of the most respected tire makers--Hutchinson--is behind it.  They don't sell that insert alone, but as part of their "Serenity" tire, which is like one of their city tires (I forget the name of it ) with a tough casing. 

From the Tannus website

Knowing that, you also probably won't be surprised to know that another company--Tannus--is reviving the idea of the Zeus tire.  Like the Zeus, it's a fully-molded solid tire that come in an array of neon colors that would have sent even Valley Girls running and hiding.



As George Santayana said, those who ignore the past are doomed to repeat it.  The pneumatic tire is one of the most important inventions in the history of the human race, and certainly the most important bicycle-related inventions.  Without that chamber of air floating and cushioning the bike and its riders, the bicycle, most likely, still couldn't be faster than a horse, even with Eddy Mercx pedaling.