One of the 5 Fastest Tires in the World

Off The Beaten Path

Recently, the German magazine TOUR published a table showing the ‘five fastest tires in the world.’ We are excited to see our Compass Bon Jon Pass 700C x 35 mm tires on this list, in the company of the fastest racing tires. A 35 mm-wide tire on a list that otherwise includes only tires between 23 and 26 mm wide! That by itself is already cause for celebration. It means that our casings really are among the very fastest in the world.

And since all our tires use the same casings and construction, TOUR‘s results apply not just to the Bon Jon Pass, but to all Compass tires. I was surprised that they tested the Standard casing. I would love for them to test the Extralight, which we know from our own experience to be even faster.

What is interesting is that the Compass tire scored superbly on smooth…

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Myth 4: Stiffer Frames Are Faster

Off The Beaten Path

To celebrate 15 years of Bicycle Quarterly, we are examining 12 myths in cycling – things we (and most others) used to believe, but which we have found to be not true. Today, we’ll look at frame stiffness.

When we started Bicycle Quarterly, the thinking about frame stiffness fell into two camps. The majority of cyclists subscribed to the notion that frame flex wastes energy and that stiffer frames are faster. A few scientific types believed that the energy lost to frame flex was small, and thus frame stiffness probably does not matter. There were a few builders, like Bill Davidson, who extolled the ‘lively ride’ of lightweight tubes, but they were mostly ignored.

At Bicycle Quarterly, we mostly subscribed to the notion that it didn’t matter. And so we were happy riding relatively flexible frames… Sure, stiffer frames might offer marginally better performance, but seeing…

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Myth 3: Fenders Slow You Down

Off The Beaten Path

To celebrate 15 years of Bicycle Quarterly, we are looking at ‘12 Myths in Cycling’ – things that aren’t quite what we (and most other cyclists) used to believe. Part 3 of the series is about fenders.

Many cyclists here in Seattle install fenders when the rainy season starts, and remove them for the dry summer months. British time trialists even had quick-release fenders that they used on the ride to the start; then they took off the fenders for the actual competition. Our research indicates that this isn’t necessary – fenders don’t slow you down. Here is why:

Aerodynamics

Bicycle Quarterly did extensive wind tunnel research on the aerodynamics of real-world bicycles. Among things like riding position, clothing and bags, we tested the aerodynamics of fenders. We made a telescoping front fender, which allowed us to test various configurations. Here is what we found:

  • The portion of the…

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Myth 2: Titanium is Lighter than Steel

Off The Beaten Path

In part 2 of our series ’12 Myths in Cycling,’ we’ll look at why titanium isn’t always lighter than steel. I can hear you saying, “What? Everybody knows that titanium has half the density of steel.”

That much is true: The same part made from titanium will weigh half as much as the equivalent from steel. But titanium has only half the stiffness, so the part will be half as stiff. To make the parts of the same stiffness, you need to use twice as much material with titanium, and the weight will be equal. The same applies to aluminum, which is one-third as heavy and one-third as stiff. (These numbers are for the high-strength alloys; raw aluminum, titanium and iron are not strong enough to be used for cycling applications.)

For example, if you made a titanium rack, it would weigh the same as a steel rack with the…

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Lyli Herse, 1928 – 2018

Off The Beaten Path

Lyli Herse would have turned 90 years old today – and this post was written to celebrate her life that has inspired so many of us. But alas, I have to report instead that Lyli died on Thursday after a very short illness. Despite the great sadness of losing her, let’s celebrate her anyway, because that is what she would have wanted.

Until just a few days ago, she remained healthy and happy, living with her dog in the house built by her father, the famous constructeur René Herse, near the finish line of the Poly de Chanteloup hillclimb race. These two elements – her father’s bikes and cycling competition – were the defining elements of Lyli’s life.

Lyli first entered top-tier competition at the tender age of 16 years, when she raced in the 1944 Poly hillclimb race, which had categories for professional racers, randonneurs and mixed tandems. She…

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New SON Generator Hubs!

Off The Beaten Path

We are excited to announce the latest SON generator hubs. The biggest news is the connector-less SL system for thru-axle hubs: Now you can remove your front wheel and its generator hub without having to disconnect any wires, even with a thru axle.

The system consists of three parts: The heart is the SONdelux 12 generator hub. The SONdelux is the lightest generator hub in Schmidt’s program, and it has the least resistance, so it was a natural choice for this application.  The flanges are spaced as far apart as possible while still leaving room for the disc rotor and caliper.

This hub has proven itself for many thousands of miles. What’s new is the lack of external connectors for the lighting wires. The current is transmitted via the axle (positive) and an insulated ring that is pressed onto the axle (negative). Like its counterpart with external connectors, the connector-less SL…

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Why René Herse Cranks Aren’t Anodized

Off The Beaten Path

Sometimes, we get questions about why our René Herse cranks aren’t anodized. Some even wondered if this was a cost-saving measure. Rest assured, Compass never will choose a cheaper process over a better one. There is a reason why our cranks aren’t anodized:

When I was racing, I bought a beautiful used Campagnolo Croce d’Aune crankset (above). Named after the pass on which Tullio Campagnolo suffered from frozen fingers and no longer could open the wingnuts of his rear wheel to change gears, the Croce d’Aune group was second only to the C-Record in the Campagnolo lineup. They were a smart design and beautifully made.

The cranks had very few miles on them, as witnessed by the (then) almost-new chainrings. Even so, I paid very little for the cranks – because they had lost some of their beauty. The previous owner’s ankles had rubbed against the crankarms and worn through the…

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