By Coach John Hughes On average, if you are riding in moderate conditions each hour you’ll produce 600 to 800 ml (21 to 27 fl. oz.) of sweat! In extreme conditions, you could easily produce 32 fl. oz. (1 quart, or 1 liter) or more of sweat per hour. Sodium is the primary electrolytes lost in sweat, along with some potassium. According to the American College of Sports Medicine (ACSM), if your ride is less than four hours, you probably don’t need to supplement with electrolytes unless your jersey is caked with salt or you cramp. If your ride is longer than four hours, then additional sodium and potassium are recommended.
By Jim Langley Here’s a question and answer with a roadie from St. Louis named Robert. It concerns tubeless tires versus tubed ones, one of the more complicated choices cyclists have today. Since you might be trying to decide for yourself, our conversation could be helpful. Also, we have written a lot about tubeless tires since they first appeared on the scene. You can read numerous articles by using the term "tubeless" (no quotation marks necessary) in the Search field at the upper right of any page on the site.
By Sheri Rosenbaum Smith’s PivLock Arena’s light weight, wraparound lens and adjustability combine to provide great fit and performance. As a contact lenses wearer, I appreciated the coverage and never had an issue with debris or wind affecting my eyes. The PivLock feature makes it simple and quick to change lenses, allowing you to find the perfect lens for the riding conditions you face. The price tag puts these sunglasses on the higher end of the spectrum, but the quality optics and performance make them a worthy choice.
By John Marsh Another week of the Tour de France, another dose of controversy. This seems to be a Tour destined to be most remembered not for epic racing but for the realization of many of the potential negatives inherent in the race. I don't know about you, but on my rides with buddies last week and this, one hot topic of conversation continued to be Peter Sagan's disqualification. And the other was the incredible crash-marred Stage 9, which took out 11 (I've also read 12) riders on the day.
Today's QT comes to us from Premium Member Richard M., who offers a few suggestions for what you might do with your old tubes after a puncture. I'll chime in after Richard to tell you the most common thing I use my old tubes for. And I invite you to share your own uses in the Comments below the Newsletter version of this article. It seems that of all the old bike stuff, tubes have about a million and one uses. —J.M.
Editor's Note: Some time ago, a Premium Member wrote in to ask if we could update an article we ran in which a couple of us on the RBR Crew provided a quick rundown of our favorite tires, and why we liked them. It was an excellent idea. So good, in fact, that I immediately decided to make it a regular feature – providing a rundown from RBR Contributors on our favorites across the spectrum of components, nutrition, clothing, accessories, you name it. Today we discuss our computers. (Here's a link to the gamut of RBR Favorites.)
By Gabe Mirkin, M.D. Power napping for an hour can help you to learn, remember and interpret more efficiently. Try to nap before having an important interview, writing a report or learning new concepts. Many employers such as Google, Uber, Zappos and PricewaterhouseCoopers provide facilities for their employees to nap during their workdays. Napping also helps athletes to recover faster after intense workouts. Meb Keflezighi, the 2004 Olympic marathon silver medalist and winner of the 2014 Boston Marathon, naps regularly.