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Feb 172012

Bontrager Aeolus Wheels

Bontrager Aeolus Wheel

Aeolus 9.0 Rear Wheel (Clincher)

Trek Bicycle’s recent development of a new line of Aeolus D3 tubular wheels, each of which is the world’s most aerodynamic wheel in its class. Bontrager wheels are the fastest way across the finish line.  The aerodynamic drag performance of this new wheel line achieves a drag performance comparable to the next depth class from  either Zipp or HED, and the Aeolus 9 D3 is in a class of its own as the fastest non-disc wheel in the world.

Bontrager Aeolus D3 wheels offer dramatic aerodynamic drag savings over the competition. What’s the benefit of lower drag in the real world? Real, appreciable savings of time and power.   The translation of drag to seconds is independent of all other factors, including the rider’s speed.  Similarly, we can translate 10g of drag savings to power savings, but this translation depends on the rider’s speed.  For example, 10g of drag savings translates to 0.75 watts of power savings for a cyclist traveling at 40kph (25mph).  The  230g drag variance determined by wind tunnel tests between Aeolus D3 and the highest-drag wheels translates to 17 watts of power.

Bontrager R4 Aero Tire

Bontrager R4 Tire

Bontrager R4 Tire

The World’s Fastest Tire combines the aerodynamics and low rolling resistance of the R4 tire with a new streamlined profile saving you 9+ seconds over the next fastest tire in a 10k time trial, and more than 37 seconds faster over a 40K time trial than our closest competitor

Bontrager’s development process of the Aeolus Wheel

When developing the Bontrager Aeolus D3 wheels, Bontrager engineers aimed to understand the core fluid dynamic phenomena that contribute to a wheel’s aerodynamic drag. We then leveraged this understanding in a series of parametric tests where every aspect of the wheel’s geometry was tuned for ideal airflow. This true scientific process is expensive and requires a high level of expertise—and it is the most effective method for developing optimal aerodynamic shapes. For this project alone, Bontrager engineers conducted over 2,000 CFD (computational fluid dynamics) simulations and over 900 wind tunnel measurements spanning 107 individual wind tunnel tests.

Bontrager took full advantage of their unique relationship with Trek Bicycle and its wealth of aerodynamic expertise and tools, resulting in a highly efficient and accurate design process. Each wheel’s aerodynamic development took two weeks of CFD testing, followed by a wind tunnel test of three prototypes per wheel depth. This efficiency allowed for rapid delivery of cutting-edge technology today.

Aeolus 3 D3: no-compromises climber

The Bontrager Aeolus 3 D3 is a no-compromises climbing wheel, offering generous drag savings over wheels of similar depth. In fact, it even beats the 10mm deeper Zipp 303 in almost all wind conditions. Furthermore, Aeolus 3 D3 dramatically beats the 21mm deeper Easton EC90 Aero wheel Aeolus 5 D3: ultimate all-around versatility The Bontrager Aeolus 5 D3 is the ultimate all-around wheel for maximum versatility. For all but the steepest hill climbs, the marginal weight increase is well worth the significant drag savings over the shallower depth class. Aeolus 5 D3 beats the HED Stinger 4 and Zipp 303 by a margin much greater than can be attributed to the 5mm depth advantage. Furthermore, it offers consistent drag savings over the 8mm deeper Zipp 404 Firecrest. Finally, Aeolus 5 D3 nearly ties the 10mm deeper 2011 HED Stinger

Aeolus 7 D3: ultra-high performance

The Bontrager Aeolus 7 D3 is the ideal wheel for the flat-lander or the lighter-weight triathlete looking for an extra bit of stability over the very deepest wheels. In fact, it has a slightly lower average drag than the 11mm deeper Zipp 808 Firecrest up until stall (from 0-12.5˚ yaw). Needless to say, it also beats the rest of the wheels in the same depth class and even the very deep Zipp 1080

Aeolus 9 D3: world’s fastest

The Bontrager Aeolus 9 D3 is the fastest non-disc wheel in the world. It achieves both the lowest minimum drag at negative 40 grams and the latest stall point at 14.5˚ yaw. This delayed stall is critical, since these deep wheels lose most of their aerodynamic benefit at the instant of stall. Furthermore, the Aeolus 9 D3 stalls much less severely than any other wheel in its class, offering significant drag savings even after stall occurs. Since stall is so critical to these deep wheels, the stall angle of the fastest wheel from Bontrager, HED, and Zipp was measured to 0.5˚ accuracy

The full Bontrager Aeolus D3 lineup

The Bontrager Aeolus D3 wheel line has a consistent spread of drag performance across all depths and yaw angles, providing an athlete with a simple choice for the wheel that fits his/her needs. Also note the low poststall drag, a consistent characteristic of the Bontrager wheel line

Brand-by-brand summary

The Bontrager Aeolus D3 wheel achieves a drag performance comparable to the next depth class from either Zipp or HED, and the Aeolus 9 D3 is in a class of its own as the fastest non-disc wheel in the world

When plotted the drag force against the side force instead of the rim depth the general trends remain the same. This demonstrates that the Bontrager Aeolus D3 wheel line allows a rider to enjoy the side force stability of a shallower wheel while achieving the same drag savings as a deeper competitor wheel.

Summary of the Aeolus Wheels and R4 Tire

Aeolus D3 Wheel

  • Dual Directional Design.
    • D3 profile reduces drag on both the tire-leading and rim-leading edge. This not only makes you faster, it gives you more control in a crosswind.
  • Shape is more important than depth.
    • D3 rim shape is so aerodynamic that even our shallowest rims compete with other brands’ deeper wheels.
  • Shallower is better.
    • When you run shallower wheels, you reduce weight, decrease the watts required to climb, increase acceleration out of corners, and improve handling on windy days.
  • OCLV Carbon: the world’s best carbon.
    • Hand built in USA from our exclusive aerospace-grade carbon. Stiffer, stronger, lighter, better.
  • Stacked lacing, stiffer wheel.
    • Innovative pattern of straight nailhead spokes widens the bracing angle on rear wheels for more lateral stiffness.
  • Long-term precision.
    • DT’s proven drive mechanism comes standard, with superlight 180 internals on tubular and precision 240 internals on clincher.

R4 Tire – The Worlds Fastest Tire

  • More than 37 seconds faster over a 40K time trial than our closest competitor
  • For higher performance, racing purposes only. Not intended for everyday use or training 220 tpi casing provides ultra low rolling resistance and excellent ride quality
  • CFD-aided tread profile for better aerodynamics on contemporary rim widths
  • Aero wings help slice through the wind
  • Integrated sub-tread puncture protection

In San Diego you can check the Aeolus Wheels at:

El Camino Bike Shop
121 N. El Camino Real, Suite A
Encinitas, CA 92024




Jul 052009

El Camino Bike Shop will have some of these in Soon…

3 years in the making and with thousands of design hours behind it the 2010 6-Series Madone is raising the bar yet again. Lance Armstrong and Alberto Contador aboard these new machines at the Tour de France

A few 6-Series features to check out:

  • A reshaped seat mast that shaves weight and adds vertical compliance.
  • A new Bontrager Race XXX Lite fork with an asymmetrical steer tube design allows more frontal compliance, and improved lateral stiffness.
  • Redesigned tube shapes that reduce material and save weight – combined you have a frame and fork that sheds 150g off of last year’s already svelte design!
  • An entirely new cabling system that offers superior cable protection, a simpler routing path.
  • A new “duotrap” sensor integrated into the frame eliminating the need for zipties and works with all the major ANT+ wireless computers.

A 56cm ProFit Fuselage (frame, fork with full steerer, mast cap) weighs in at 1380 grams. The frame weighs just 890g.

That means the Madone 6-Series fuselage, made from Trek’s Red level OCLV carbon, is 150 grams lighter than earlier models. The frame makes up two thirds of the weight savings, while another 30 grams is saved from the fork and 20 grams are cut out of the seatmast cap.

Lighter / Stiffer – Who could ask for more- Come in to El Camino Bike Shop in Encinitas, CA to check them out.

Feb 012009

The Soho will be available in March, but we got a chance to check the bike out…

Trek’s Soho is a great commuter bike for the hills here in North County San Diego. With tons of features, these deceptively simple bike are still somehow chock full of the little touches that add up to the top bike on the market today for those urban riders who use their bike for getting around town.

Almost inch by inch up and down this bike, Trek’s engineers have built a number of commuter specific items into the Soho to make this ride both comfortable and practical for getting you around town.

The first and most obvious touch is almost a comedic one to show you’re a serious commuter. What is it? A coffee cup, of course! You need your joe in the morning, and so with the Soho bike you can get a stainless steel commuter coffee mug designed specifically for it that goes in your watter bottle cage complete with Soho label. The mug itself is a high-quality insulated container that is self-sealing to keep dirt out and your drink hot or cold for a long time.

Another brilliant and highly visible design element are long rubber bumpers implanted in either side of the top tube. The people at Trek who put these in are people who know the reality of riding in an urban environment. These strips, in addition to just looking cool, serve as a cushion when you lean your bike up against stuff, keeping your bike free from dents and dings in the paint. Also, if you’ve used a sign or another type of post as a bike rack, you know it’s easy for your bike to slide and scoot forward and flop over. The rubber bumper helps keeps the bike in place because it’s a better gripper than bare metal.

Belt-Drive – Durable Components and Easy Maintenance

The Soho ($989) has an intriguing belt drive set-up paired with the internal gearing of the 8-speed Shimano Nexus 8 rear hub. Using a Gates C-Drive carbon composite belt, Trek bills it as “brutally tough yet cleaner than any chain you’ve ever owned.” The Belt drive is super quiet and easier to maintain that traditional chains, and the range of gearing will allow you conquer the steepest hills as well as max your pedaling for all-out speed on the flats.

The Soho uses an internal Shimano IM50 roller brake, again contained in the hubs, making maintenance a snap as your brake parts aren’t continually subjected to dirt and moisture. Bontrager Hardcase tires with integrated reflective sidewall comes standard for safer night riding on the Soho; matching fenders are another nice plus for people who have to count on their bike to get them around in all types of weather.

The Soho is built on a lightweight Alpha Black Aluminum frame with built-in dropouts that allow mounting of a rack and fenders without special mounting hardware.

The Soho is the true commuter bike, it is going to appeal to most people who are thinking about the decision to buy a bike like this much as they would analyze a potential new car purchase. What kind of features does it have, and what do I need? The Soho has all sorts of terrific features that will appeal to commuters and urban riders for their true convenience and benefit they offer. Despite the fact that the nearly thousand dollar price tag is going to be a deterrent to many cyclists, the fact is that the Trek Soho is a great value at this price point given the innovative engineering built into it. The cutting edge belt drive and internal hub and brake system should save you a lot on maintenance, repair and replacement over the years, even with everyday riding in all sorts of elements.

Jan 212009

Check out the detail here..

There is a rumor that there are a few hidden messages in the graphics (none of them shown here). Trek Team liaison Ben Coates promises he will share their meanings when he posts photos of the complete bike. Watch for more photos in the weeks to come!

See more here…