Bikes & Tech: Page 519

Bike and gear reviews, maintenance how-tos, and tips

Armstrong request accelerates design process

When Lance asks, you have to be ready to deliver. Take, for example thisstory of Armstrong’s new time trial handlebar. The day after the finish of the Midi Libre, U.S. Postal team managerJohan Bruyneel calls Deda Elementi, the team’s handlebar sponsor, to reportthat Lance is unhappy with his current equipment and wants something lighterfor the upcoming Dauphiné Libéré and the Tour. The next day, May 28, representatives from Deda drive from their factoryin Campagnola Cremasca, Italy, to Les Deux Alpes to meet with Armstrong,Bruyneel and Lance’s mechanic, Jean-Marc Vandenberge. At the

Technical FAQ with Lennard Zinn: Koski Stronghold Deluxe mountain-bike stem

Features: The Koski Stronghold Deluxe is a forged hollow stemof 6061-T6 aluminum with a four-bolt polished silver front plate. The shaftis matte black.The Stronghold Deluxe stem is available in two finishes, called “shotpeened black” and “polished silver,” two angles, namely 7 and 15 degrees,and five lengths: 60, 75, 95, 110 and 130mm.All of the bolts take a 5mm hex key.Likes: This is a handsome and lightweight stem available in lotsof finishes, angles and lengths. It is plenty stiff, and it has a largeclamping area with the bar (these two features are probably interrelated).Dislikes:

Technical FAQ with Lennard Zinn: Deda Mag00 road stem

Features: The Mag00 is a superlight magnesium stem for an oversized31.7mm handlebar diameter. It is machined from AZ 80 A, T5 temper magnesium,under a controlled inert-gas atmosphere and immediately coated afterwardsto prevent the oxidation and consequent weakening of the magnesium.The four-bolt front cap is made of carbon fiber with, according to Deda,the fibers oriented along the lines of force. All bolts are 6/4 titaniumfor a 4mm hex key.The Mag 00 comes in an 80-degree angle with lengths of 90, 100, 110,120, 130 and 140mm.Likes: The stem is extremely light while being adequately stiff.I

Technical FAQ with Lennard Zinn: Deda Newton mountain-bike stem

Features: The matte-black Deda Newton is machined from 2024 T6aluminum. The silver front cap is held on with four titanium bolts, which,like the fork-steerer clamp, accept a 4mm hex key.The Newton comes in 90- and 95-degree angles in lengths of 105, 115and 125mm. The Deda N’Bar matches it in graphics and quality.Likes: Like the Newton road stem, this is a strong, superlightstem, and I find it to be adequately stiff.Dislikes: Not a one.Other: You have to very careful not to over-torque the smallbolts.The Deda single-bend bars, namely the N’Bar and BarOne, come only inthe relatively short 560mm

Breaking the bar

When a carbon fiber handlebar breaks, it makes a sound like a snapped twig.There’s a sharp “crack!” followed by a hollow splintering sound, just asif you’d broken a dry stick over your knee. Then, silence.The similarity in sound is due to the similarity in structure. Carbonfiber, like wood, is made of long strands of high-strength material surroundedby a resin matrix. Trees do it with cellulose and sap. Engineers do itwith synthetic polymers and glue.The difference, of course, is that carbon fiber is considerably strongerthan wood; in fact, carbon’s raw tensile strength figures typically