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Braking Constraints – Aluminum vs Carbon

Posted on Jan 12, 2014

Aluminum vs Carbon Fiber Wheels In choosing a wheel technology (aluminum, scandium, carbon fiber, ‘carbon wrapped aluminum’), several important aspects need to be considered. The following information was obtained from Mavic and describes the advantages/disadvantages and issues well. But first, it is my opinion that Full-Carbon Fiber wheels should be used in racing ONLY, configured as a tubular wheel. For training, use a high quality clincher wheel. A Carbon wrapped aluminum wheel is OK for training but the cost is usually more than a high quality clincher. Braking Constraints: Heat Dissipation: Brake heat is the first barrier to overcome when designing a reliable carbon clincher rim. It has to be treated first in priority. Heat dissipation & related issues: During sustained and hard braking both the rim brake track surface and the pad surfaces can reach +200°C (+392°F).  If the rim brake track is not 100% flat and smooth, wide spots in the brake track can concentrate heat up to 250°C (+482°F) in the area between the rim hooks, which also heats the inner tube which is getting into...

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Quick Tip for Grinding Brakes

Posted on Jan 9, 2014

Quick Tip- After early seasons rains, I hear a lot of metal-on-metal grinding sounds when cyclists come to a stop. This is because as you brake, small shavings come off the rim and embed themselves in the soft rubber brake shoes. This (a) decreases brake efficiency, and (b) wears the rims out quicker due to the metal in the brake pads grinding on the metal rim. Solution: Every month, take a small tool with a sharp edge on it (I use an old small screwdriver that I have reprofiled to a sharp edge on each side of the spade, but you can use anything else such as a small knife blade, the point of a small pick, etc) to dig the metal shavings out of the shoes. This will result in more efficient and noiseless braking, and extended rim life. A good set of Dura Ace wheels will set you back close to $1,000 so all the better reason to make them last as long as possible. Remove the wheels from the bicycle and carefully dig out the shavings....

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Mechanical vs Electric Shifting vs Aero

Posted on Oct 15, 2013

  The group of cyclists that can take the biggest advantages of this new technology are the triathletes. But, unless its a hilly course, how many times do you actually shift? For the road group, Shimano has added sprinters switches as well as climbers switches and, the way they are designed, you can add an almost unlimited number of switches. Let’s say for example you have a Cervelo S5. Getting the bike ready for an upcoming triathlon, you add aero bars to your S5. Running Di2, you can now add shift points to the end of the aero bars as well as shift from the road levers. You can even add a sprinters switch as well as a climbers switch to the bars. A truly versatile system. BUT, lets talk honestly about TT. Aero trumps everything else and to be honest, MOST time-trialers and triathletes would benefit far more from a bike fit AND using the correct sized components, than gain any advantage of using electric shifting. Most triathletes are so ill-fitted that their position in their aero bars...

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Have the bicycling clothing manufacturers priced themselves out of the market?...

Posted on May 13, 2013

Your thoughts? Do you think the cycling clothing manufacturers have just about put their jerseys out of the reach of most people? Maybe that’s why I’m seeing more and more ‘Performance Bike’ jerseys on cyclists? email us or comment and let us...

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Roof Racks can be Hazardous to your bike

Posted on May 3, 2013

I don’t need to add too much to this, but, I still hear local stories on this all the time. DON’T FORGET TO REMOVE BIKE FROM ROOF RACK BEFORE DRIVING INTO GARAGE!...

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Pet Peeve #1

Posted on May 2, 2013

WEARING TEAM KIT ARM WARMERS ON THE WRONG ARMS The thing that irks me and I tell guys all the time… “You are wearing your team kits arm warmers on the wrong arm. Inevitably, 1/2 of the cyclists out there have the warmers on the wrong arms so the sponsors name is upside down when riding. PEOPLE, CHECK YOUR ARM WARMERS for correct positioning of your sponsors...

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Recovery Pulse vs Resting Pulse Rate

Posted on May 1, 2013

From Dr. Gabe Mirkin’s Fitness and Health E-Zine April 28, 2013 High Resting Heart Rate Increases Death Risk in Healthy People The Copenhagen Male Study followed the health of 3000 men for 16 years and found that the higher the resting heart rate, the more likely that person is to die (Heart, Apr 17, 2013). Those who had lower resting heart rates and did not exercise still lived longer than those who had higher resting heart rates, even if they exercised. The authors conclude: “This suggests that a high resting heart rate is not a mere marker of poor physical fitness, it is an independent risk factor for premature death.” The authors adjusted results for heart attack risk factors such as smoking, obesity and physical fitness. Compared to a resting heart rate of 50 beats per minute, a resting heart rate of • 71 to 80 beats/min was associated with a 50 percent increased risk of death during the study period, • 81 to 90 beats/min was associated with a 100 percent increased risk, and • over 90 beats/min...

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Wheel Selection – A Point to Consider ?

Posted on Apr 29, 2013

I have discussed this with several of the hard-core Cervelo testers and riders and have come to the conclusion that Wheel selection is as important as frame selection. Meaning that I believe a given frame is designed with a specific wheel in mind. Here’s what happened. I have an R5ca and wore out a set of C24 wheels. I bought a set of C35’s for the bike, but the bike felt dead – felt like a piece of lead being pushed down the road. I seemed to have to labor more to spin the pedals. Went back to C24’s and the bike sprang back to life. It again feels light and very responsive. I could definitely feel a TREMENDOUS difference between these two wheels. I also have a Giant TCR Advanced SL that rides much better with C35’s than C24’s. My opinion is that C35’s are way too stiff for an already stiff (R5ca) frame, and the C35 wheels seemed to throw off the performance balance of the bike. But again, the Giant TCR Advanced SL loves the C35’s...

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