Technical FAQ: Page 64

Bike Tips and Maintenance with Lennard Zinn

Technical FAQ with Lennard Zinn: Shimmy testing and fixing tips

Lennard Zinn /

VeloNews technical writer Lennard Zinn is a frame builder, a formerU.S. national team rider and author of several books on bikes and bikemantenance. This is the third of Zinn's weekly VeloNews.com column devotedto addressing readers' technical questions about bikes, their care andfeeding and how we as riders can use them as comfortably and efficientlyas possible. Readers can send brief technical questions directlyto Zinn. We'll try to print a representative sample of questions eachThursday.First, some follow-up from our last columnA few more reader comments on the creaking bottom bracket

Technical FAQ with Lennard Zinn: Where to buy custom stems

Lennard Zinn /

VeloNews technical writer Lennard Zinn is a frame builder,a former U.S. national team rider and author of several books on bikesand bike maintenance. This is the second of Zinn's weekly VeloNews.comcolumns devoted to addressing readers' technical questions about bikes,their care and feeding and how we as riders can use them as comfortablyand efficiently as possible. Readers can send brief technical questionsdirectly to Zinn. We'll try to printa representative sample of questions each Thursday. First, some follow-up from last week Lastweek there were a couple of questions that encouraged an

Technical FAQ with Lennard Zinn: Custom crank option for leg-lentgh discrepancy

Lennard Zinn /

VeloNews technical writer Lennard Zinn is a frame builder, a formerU.S. national team rider and author of several books on bikes and bikemantenance. This marks the beginning of Zinn's weekly VeloNews.com columndevoted to addressing readers' technical questions about bikes, their careand feeding and how we as riders can use them as comfortably and efficientlyas possible. Readers can send brief technical questions directlyto Zinn. We'll try to print a representative sample of questions eachThursday.Question: Do you have any advice for correcting leg lengthdiscrepancies?  I have undergone an

Technical FAQ with Lennard Zinn: Ullrich’s superlight ride (updated text)

Lennard Zinn /

Jan Ullrich has done everything he can to lose weight off of his body. He and his mechanics have also gone to extraordinary lengths to take a full kilogram off of the bike he uses in the mountains. The big German also has some particular preferences about his components, and his mechanics and suppliers clearly bend over backward to accommodate them. Ullrich’s climbing frame is a lighter version of his Pinarello Prince. It appears to have standard Prince carbon fork and seatstay wishbone, but the aluminum main tubes have thinner walls, and the down tube is smaller diameter. As his climbing

Technical FAQ with Lennard Zinn: U.S. Postal team Treks

Lennard Zinn /

There are four different colors of Treks you will see U.S. Postal racing on in the Tour. These are two different road bikes and two different time trial bikes. The two road frames you can buy, and there is no difference between them and models sold in bike shops. The two time trial frames are strictly team issue. This use of stock frames is unique at that level of racing. Almost all top riders have frames custom built especially for them, often by a manufacturer other than the one whose name is on the frame. In fact, Trek claims that Lance Armstrong's two Tour victories were the only ones

Technical FAQ with Lennard Zinn: TdF wheel selections

Lennard Zinn /

In addition to the teams mentioned yesterday, Kelme is also using wheels with carbon braking surfaces – namely Shimanos with carbon rims. Like Shimano’s aluminum wheels, they have paired spokes with their heads in the side of the rim and nipples at the star-shaped hub. Kelme uses Shimano’s red cork brake pads with them. ADA also makes a rubberized cork pad for carbon rims that are claimed to provide consistent braking on carbon rims, even when wet. Its pad fits in both Shimano and Campagnolo brake-pad holders, but not in Corima pad holders. Telekom has been using ADA pads in the past but

Technical FAQ with Lennard Zinn: Pro riders’ wheels

Lennard Zinn /

The wheels are arguably the most important part on a bicycle and are thus the source of constant efforts for improvement, and, for a team, to find an edge over, or at least parity with, the other teams. There are a number of physical properties of a wheel that teams have to consider. A gram of rotating weight out at the rim is worth about two grams on the frame, so weight reduction is obviously critical. Wheels are big egg beaters of the air, and any reduction in their aerodynamic friction can pay off, especially when the rider is not sheltered in the peloton. In order that the rider can

Technical FAQ with Lennard Zinn: Look time trial bikes

Lennard Zinn /

Look time trial bikes, which took a black eye a few years ago with some weak forks, pulled off the ultimate Tour victory – an entire team winning a stage on them. This, the day after Laurent Jalabert notched a win with a Look road bike, and two days after Stuart O’Grady took over the yellow jersey riding yet another. There are more Look bikes in this Tour than any other make, as four teams (Credit Agricole, Kelme, Big MAT and CSC) are riding them. That puts Look ahead of Pinarello, which has three teams (Telekom, iBanesto and Fassa Bortolo), and Colnago, which has two (Rabobank and Mapei).