Jadyn Perlman
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eTap is the name of SRAM’s proprietary electronic drivetrain for bicycles — the first truly wireless electronic shifting system and the heart of its RED eTap road group. Shift signals are transmitted and received via SRAM’s fully wireless protocol known as Airea.
The system, brought to market by SRAM in 2015 and used in a stage win that year in the Tour de France, is now available on several higher-end consumer bikes and, will, we suspect, eventually be used on less expensive models as well.
SRAM’s eTap system offers many welcome features, one being that it’s easy to install and tidy on the bike due to the absence of wires and cables. Better yet, buttons on the shift levers permit riders to make micro-adjustments to chain positions on the fly. Additionally, eTap allows the placement of small satellite shifter buttons called Blips anywhere on the handlebars or aero bars. There’s even a remote shifter called a BlipBox available that permits shifting both derailleurs in both directions with one hand.
What’s more, eTap’s front derailleur functionally can best be described as “smart.” As SRAM explains it, “Depending on which gear you’ve selected on the rear derailleur, the eTap front derailleur will vary how far it initially moves the chain before settling in a moment later to its final position relative to the chainring selected.”
Early on, some cyclists were concerned that other transmissions in the rider’s area might interfere with wireless shift systems (a problem that did affect the first couple of wireless computers I purchased), or that shifting could even be hijacked by miscreants. SRAM, however, extensively tested the system using hired hackers who were unable to take control of it. And eTap performed just fine at the Tour de France, where the surrounding broadcasting equipment had no impact on the system’s functioning.
SRAM also offers a hydraulic disc-brake version called SRAM RED eTap HRD. Its brakes make use of a hydraulic lever design with both lever reach adjustment and lever contact point adjustment, which is a first for road disc brakes. That group, purchased aftermarket to install on your existing bike, will set you back nearly $3,000. Without the hydraulic brakes, expect to spend about $2700 for the groupset.
Since 2016, RED eTap road groups have been available as standard components on some high-end bikes from several manufacturers, and we offer a sampling below. All have 11-speed rear cogs and 2 chainrings. To keep the comparisons somewhat comparable, all the models we looked at have rim brakes rather than disc brakes. (For that reason, we did not include the Trek Madone, which apparently puts only disc brakes on its current models that use eTap.)
There’s a lot to like about these bikes except for one really big sticking point — the price. But even if you don’t want to drain your bank account and buy one, it’s sure nice to look at them and dream, isn’t it?
https://www.nytro.com/bmc-teammachine-slr01-one-red-etap-road-bike.html
Swiss bicycle maker BMC says that one reason this ultra-lightweight premium carbon machine is so fast is its use of asymmetrical tube shapes that deliver a superior ride experience and a competitive advantage. It features TRP T980 direct mount brakes and a DT Swiss PRC 1400 SPLINE 35 carbon wheelset. If you’re racing on the Teammachine and not leading the pack, it’s not the bike’s fault. It can be yours for about $9,000.
https://www.cannondale.com/en/USA/Bike/ProductDetail?Id=66afc8a5-91bc-441c-ba20-e05ca570fb71
Available for about $8000, this U.S.-branded, race-proven bike is lightweight, stiff and aerodynamic. Made from BallisTec Hi-MOD full carbon, the SuperSix is designed to maximize your power and speed in every race.
https://www.canyon.com/en-us/road/ultimate/ultimate-cf-evo-10-0-ltd-us
This bicycle’s German maker describes the Ultimate CF EVO 10.0 LTD as “a bike with no compromises,” and it brags about it being both super light and durable. “This isn’t the first bike ever produced to hit these sorts of lightweight numbers,” its maker says, “but it’s the first you’ll be able to feel confident won’t break the very first time you skid out on a sandy corner or pack it for a vacation in the mountains.” That said, its pedigree is racing, and it’s intended to be a competitor. Sells for about $8,500.
http://www.bianchiusa.com/bikes/road/extreme-racing/oltre-xr4-red-etap/
Bianchi’s patented CounterVail frame technology — an integrated vibration cancelling system that’s imbedded within the layup of this high-performance bike — is arguably the most advanced comfort enhancement in carbon-fiber frames, giving it excellent stability at high speeds, mountain descents, and fast corners. Bianchi says the CounterVail construction reduces muscle fatigue; allowing the rider to hold an aero position during long periods of time. Used by the Dutch team at the Tour de France, this bike typically sells for about $10,800.
https://www.specialized.com/us/en/s-works-tarmac-etap/p/115701
This all-around race bike has been proven in Grand Tours and World Championships. Specialized, a U.S. manufacturer, uses its trademarked Rider-First Engineered design that applies specificity to every tube size and carbon layup for every frame size, thus creating the optimal balance of rigidity, weight, and responsiveness, so every frame, regardless of size, performs just as intended. The full carbon fork with tapered construction provides front end stiffness and steering response for instantaneous accelerations and high-speed descents. Sells for about $12,000.
https://www.giant-bicycles.com/us/tcr-advanced-sl-0—red-2018
As far as rim-braked models go, Giant offers two with RED eTap in its 2018 line up: this TCR Advanced SL 0 and the Liv Langma Advanced SL 0, which is essentially the same bike but in a women-specific configuration. Built on the lightest road frameset ever produced by Giant, the SLs boast what the company describes and an “unrivaled” stiffness-to-weight ratio for pure speed and efficiency. Both models include SRAM’s Quark crank power meter. Available for $9,900. Giant also offers disc brake models with RED eTap.
https://www.bikebling.com/Orbea-Orca-M11i-PRO-Road-Bike-2018-p/orbea18-orca-m11ipro.htm
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A heart block in the right bundle branch of the electrical system is called a right bundle branch block.
The right ventricle is not directly activated by impulses traveling through the right bundle branch. The left bundle branch is activated by the left ventricle. The impulses can travel through the myocardium from the left to the right and then depolarize the right ventricle.
As the myocardium is slower than the bundle of his-purkinje fibers, the QRS complex is seen to be widened. The rapid depolarization of the left ventricle is reflected by the extra deflection of the QRS complex.
The right bundle branch block is incomplete. An incomplete block has a wave duration between 120 and 120 ms, which is less than the 120 ms duration of a complete RBBB.
A study on young Swiss military conscripts found a prevalence of 13.5%, however it is not always a benign finding. Further testing should be done to exclude heart disease if there are signs of abnormality during the physical exam.
There is no consensus on criteria for diagnosis.
According to the American Heart Association/American College of Cardiology Foundation/Heart Rhythm Foundation (AHA/ACCF/HRS), it is defined by the following finding in adults.
There are three criteria for diagnosis. The fourth is needed when there is a dominant R waver.
Congenital heart disease, such as a atrial septal defect, is one of the common causes. A right bundle branch block can also be caused by Brugada syndrome, pulmonary embolism, rheumatic heart disease, myocarditis, cardiomyopathy, or hypertension.
Increased RV free wall thickness is a cause for incomplete right bundle branch block in athletes.
The criteria to diagnose a right bundle branch block.
The T wave should be in the opposite direction of the terminal. The bundle branch block is the appropriate T wave discordance. A T wave may be indicative of a heart attack.
If hypertension or diabetes are the primary underlying cause, the underlying condition may be treated with medications. If coronary arteries are blocked, an intervention may be needed.
Changes in the heart's conduction system increase the prevalence of RBBB. It's thought that up to 11.3% of the population will have RBBB by the age of 80.
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Why is a scientific calculator so expensive? Because it's a limited, specialty market. There are a few scientific calculators that are approved for standardized tests, and this is one of the main uses for these. Like textbooks, it's a relatively small captive audience that will buy one of a specific few models.
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