Lennard Zinn

We’ve seen what the system looks like on the Movistar Pinarellos, but we don’t know many details.

Since Steve Hed and Zipp started beating the drum for wider road rims, a number of other wheel manufacturers have followed suit.

VeloNews' Lennard Zinn offers up a look at the first things that caught his eye at the 2011 Interbike trade show.

Team Movistar will be rolling with Campagnolo's prototype electric drivetrain in 2011. Lennard Zinn takes a look.

As long as you move a rigid object in a straight line, it does not matter how its mass is distributed throughout it; the amount of work to move it will be the same. This is not true if you drive the object by rotating it; then how the mass is distributed does play an important role in how much energy it takes to move it. In the case of a wheel, it is probably obvious that it will take more work to accelerate it if the mass is concentrated out at its edge than at its center. But how do you quantify that?

Two of Lennard's favorite new products.

Dear Lennard Zinn;My question has to do with Campy Record 10-speed rear derailleur and cog compatibility. My current setup has 53x39 chainrings, a 12x25 cogset with a short (standard) cage rear derailleur, and I recently switched to a Wipperman 10-speed chain. For mountain riding, I would like to substitute a cogset with a larger inside cog - say, 26 to 29 teeth - rather than switching to a triple chainring setup. How high can I go before I have to use a medium or long cage derailleur? Also, for cost considerations, is there any problem using a Chorus 10-speed cogset if the rest of the

So why did ONCE go so fast on Wednesday? Was it because the team pedaled harder and stayed in better formation and had good equipment? Well, that is one explanation. Another is that all of the other teams only had nine riders, while they had ONCE (Spanish for “eleven”)! Sorry... I had to throw that in. Beyond the numbers, it is worth noting that the teams that go fastest have 100 percent of the riders wearing aero helmets, rather than a mixture of headgear and even of clothing and equipment. You also tend to see other riders on fast teams using their aero’ bars further back in the line,