Bike Design – Page 5 – Seven Cycles

Where Does Performance Really Come From?

There is this idea that, to perform really well, a bike has to be hyper-stiff, and/or the rider has to get into a maximally aerodynamic position, as if either of these characteristics, alone, yields speed.

In the last few weeks we’ve received dozens of photos of Seven riders taking on challenges like the Trans Am Bike Race, 600k brevets, the Green Mountain Double Century and Dirty Kanza. As a percentage, Seven is disproportionately represented at these events, which is to say, you see a lot more of our bikes at events that require maximum performance from racers and riders. And why is that?

Torsional rigidty, drivetrain stiffness and aerodynamics can all be good things, but in our experience they have to be balanced against fit and comfort. If the rider isn’t comfortable in his or her “aero” position, it won’t be possible to generate big power. If a rider isn’t comfortable on the bike, it will be exponentially more difficult to cover big distance.

When the chips are down and things like fit and comfort come to the fore, a custom Seven shines, because we seek those balances in all our designs. Peak performance, and peak fun, too, don’t come from shorthand answers to design questions. They come from thoughtful design, carefully chosen materials and a rider-specific approach.

Future Leap

We had an email from a rider currently in the process of getting a Seven. He had questions. A lot of them. And chief among his concerns was how we could possibly design a lifetime bike for a rider who would, himself, change over time.

These are legitimate concerns, and we put a lot of time and energy into exactly these challenges. People’s bodies do change over time, for better and for worse, so when we propose a design, that design has to be as durable as the frame materials we use. It all has to last a lifetime. So what do we do?

For us, all the variables are within our control. Head tube length and angle. Seat tube angle. Head tube extension. Unlike stock bikes, which have fixed geometries and only get adapted to a rider with spacers and saddle placement and stem length, we are starting from the rider’s perfect position, with everything centered over the wheels and no adjustments necessary. So, we start with that advantage. Once we arrive at that position, and our partner shops are good at finding it, we design so that the bars can go lower as you get fitter and/or higher as you get older and less flexible. Building in that flexibility isn’t difficult, as long as you are starting from the right point.

All of which brings us to the very idea of comfort. When it comes to your comfort, you are the expert. You either feel good or you don’t, and no fitter should tell you that you are in the correct position if it doesn’t feel correct to you. A first custom bike can be something of an epiphany. We realize that we have always been adapting to bikes, sometimes in big ways, sometimes in small ways, so we are used to being uncomfortable.

The first spin on a custom bike you think, “Oh, wow. Everything is in the right place.”

We can’t stress enough that your comfort is something you feel, not something a fitter or bike designer can prescribe. That’s why your time with a fitter will be so important. The fitting gives us that good starting point, and our personal interview with you provides us the context to understand how flexible our design needs to be. We have built 30,000+ frames this way with excellent results. We know it requires a leap of faith on your side, but we have the data to suggest it’s not as long a leap as it appears.

There Are No Bikes

There are no bikes, but only riders, more than 30,000 of them. They came to us and told us about their riding, the roads and trails they wanted to ride, and we gave them a way to get there. It’s true that, in some ways, it was the bikes that took them where they wanted to go, but without the riders, there was nothing.

This is an important distinction to make. We have never built a bike with the express purpose of convincing someone to buy it. We have only ever built the bikes that people asked us to build. The rider comes first, always.

We get somewhat regular calls from people who ask something like, “Hi, I wonder if you have a 56cm road bike in stock that I can just buy.” And we say, “Sorry, we don’t actually have any bikes in inventory,” which is true.

There are no bikes until there are riders who want them, and what they want is very specific. We wouldn’t build the same bike for you, because you are different. We have built more than 30,000 bikes, and never two the same in a row. It is a lot more fun to do it this way.

Going to the Woods

We’ve already talked about Going Up, Going Far and Going Fast. Going to the Woods is another thing we like to do, riding the jeep tracks and trails that crisscross our New England forests. We design bikes to go there in a few different ways.

Two crucial variables for any woods-oriented bikes are traction and speed. How will we keep the wheels on the ground, and how fast do we want them to move? Suspension is an option with our classic NE hardtail mountain bikes, the Solas and 622M SLX. They’re built to be fast over chattery, heavily-rooted ground and to climb the short, steep pitches we find all over. The Ti chainstays on these bikes act as de facto suspension systems, effectively keep the rear tire planted on the ground and rolling forward. For dirt road bikes, we can narrow the tires and build around a rigid fork, which will speed things up on less technical terrain.

Another key question is, how much ground are we trying to cover? Are typical rides of approximately the same length, as with a cross country race bike, or do they vary wildly, with marathon trail sessions coming as often as possible. Those two bikes differ geometrically, one built for agility and speed, the other for comfort and stability. We can build them as traditional trail bikes, or with rack mounts for bike-packing. Geometries can get more relaxed or more aggressive.

We also send our Evergreens and Expats to the trees. The Evergreens are designed to tackle mixed-terrain, some road, some dirt. The Expats are touring bikes. As with the other types of bikes we design, finding the balance points is key to delivering the right bike. Going to the Woods can add as many or more different variables than the bikes we’ve discussed in previous pieces, so working through all the basic questions is integral to the process.

Going Fast

In the last few weeks, we’ve talked about Going Up, the process of designing a climbing bike, and Going Far, the things that go into a long distance bike, which might be a century bike, a touring bike or might be a full-blown randonneuring machine. This week we turn our attention to race bikes.

The bike industry has traditionally worked backwards from race bikes to fill shop floors with race look-alikes for everyday riders who will never turn a crank in anger. What is good for the pros, so the logic goes, must be good for you, too, and for some very small number of non-pro riders, that could be true.

As with all our bikes, we start with the purpose of the bike and work forward. Going fast requires being able to sit in a comfortable, aerodynamic position, to be able to handle your bike in tight spaces, and to get good power transfer through the rear triangle.

As custom builders, getting to that perfect position is a given. We can replicate exact saddle and grip positions from a bike fitting. We can dial in handling by adjusting headtube angle and fork rake to produce the exact characteristics the rider wants. We can adjust the stiffness of the rear triangle by selecting specific diameter chainstays, up to and including the 1″ stays we call “race stays.”

Our 622 SLX rivals all of today’s carbon race machines for weight and stiffness, but it incorporates more road feel and better comfort than those bike through its unique combination of laser-cut titanium lugs and filament-wound carbon tubing. Our all-Ti Axioms make great criterium bikes for their ability to absorb the heavy impacts of racing on imperfect pavement and the way they come through the occasional crash.

The technology of race bikes evolves quickly, and adapting to new component standards can be a challenge, but with a custom bike these things can be considered during the design phase to leave you with as many upgrade options as possible.

The thing is, bikes aren’t fast. Riders are fast. The best way for the rider to Go Fast is to design a bike around them that fits them perfectly, handles the way they want it to and transfers as much of their power as possible.