“That 19-watt number, that's the whole system: the rider and the bike. In other words, you’ll save be able to achieve that speed while pedalling at a lower power. “Going from the old bike to the new bike and keeping the same bar size, we’ll see about a 19-watt improvement in drag at 45km/h (28mph).” “If I bring that down to 35km/h (21.7mph) we still get a 59-second gain, and if I bring it down to 25km/h (15.5mph) that's a 58-second improvement from the new bike. “A ride that would take you an hour normally would take you 59 minutes on the new bike,” says Trek aerodynamicist John Davis. If you ride at the same power, you'll hit 45km 60 seconds sooner. Of course, anything travelling at 45km/h will cover 45km in an hour what Trek means is that you'll achieve 45km more efficiently. To put a figure on it, Trek says that compared with the previous generation Madone SLR, the new version will save 60 seconds per hour at 45km/h (28mph). That’s a short explanation of how IsoFlow is designed to work. That hole right in front of that low energy area introduces a jet of fast-moving air that reduces the drag for the whole system.” As you pedal, you create these counter-rotating vortices, and that creates a lot of drag. “When you're riding a bike, there's a really low energy area behind you. This avoids a stretched out riding position that can cause strain on the upper body.Trek’s director of road bikes Jordan Roessingh adds, “IsoFlow is a way to direct some high energy flow into a low energy region of the bike, and that's really what we're trying to do in aerodynamics: get rid of low energy and high drag areas of the bike. The general rule of thumb for road bikes is to size down if you are between frame sizes for road bikes. I’m between sizes – which road bike size should I choose? Take an updated measurement of your height and check our road bike size chart above for a frame size recommendation. Road bike frames are sized according to rider height. What frame size bike do I need road bike? What size is a 58cm road bike?Ī 54cm road bike is a large frame appropriate for riders between 5’9" to 6'0". What size is a 52cm road bike?Ī 52cm road bike is a small sized frame ideal for riders between 5’3" to 5'6". What size is a 54cm road bike?Ī 54cm road bike is a medium sized frame appropriate for riders between 5’6" to 5'9". You can double check the recommendation by measuring your leg inseam as well. What is the right size road bike for my height?Ĭheck out our road bike size chart above to find the correct frame size for your height. To figure out your ideal bike geometry numbers, receive a professional bit fitting at any of our three Alberta locations. It’s important to find the right balance between comfort and efficiency for your body. However aerodynamic a position is, if you are noticeably uncomfortable, that means you are probably inefficient, too. This is why you might hear of pros ‘slamming their stem’ or removing all headset spacers to achieve the minimum stack height to force their bodies into a lower, more streamlined position. A long reach and low stack is an extended, aero riding position. Reach combines with the stack to determine bike fit.Ī short reach and high stack make for a comfortable, upright enduro geometry. Stack is the vertical distance from bottom bracket to top of head tube and is a good measure of how high the handlebars are relative to your upper body. This can be altered by using a shorter or longer stem. Reach, or the horizontal distance between the bottom bracket and the top of the headtube, affects how far you lean over to grasp the handlebars. Riders can enjoy extended training sessions with less strain on their back, neck, and arms. This aerodynamic position has a lower center of gravity and offers more responsive handling, but can cause stress on the upper body over long distances.Įndurance geometry has a more upright position with relaxed measurements designed for comfort and stability rather than aerodynamics. Race geometry features a lower and longer riding position with a flat back and significant bend at the hips. Some women-specific bikes have unique geometry while others have contact points that better suit women, such as narrower handlebars and an appropriate saddle.Ī bike’s geometry determines riding position as well as the bike’s handling. Our chart allows all riders to figure out their suggested frame size, rather than being just a mens road bike size chart. Most bikes nowadays are unisex, meaning any rider, regardless of gender, can enjoy them. If you fall in between road bike sizes on the chart, the general rule of thumb is to pick the smaller frame option. Many pros use a smaller frame to achieve a more aggressive, aerodynamic position. Cyclists can also choose to size up or down depending on their preferred riding style.
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