Yes, I do know that for a fact. And no, I'm not confusing Mennonites with Amish. I grew up in and still have ties with central Wisconsin, which is becoming the #2 Mennonite concentration in the country, after the Lancaster County, PA area. (Most of the Wisconsin-based Mennonites moved there from Lancaster County, mostly within the last 20 years.) In Wisconsin, I know lots of Mennonites, and have seen many of their practices and the things that they do or don't "allow". (By "lots", I'm talking at least triple-digits.) When my parents retired and sold their farm, it was a Mennonite family that bought it--and immediately set out to "convert" it to meet their religious standards.
That all said, I will admit that I'm only familiar with the particular group of Mennonites that have settled in central Wisconsin. If, as you indicate, there are varying groups of Mennonites, with varying degrees of acceptance of modernization, I'll admit that I don't know much about that. But I do know that the Mennonites in Wisconsin, while not as conservative as most Amish, do reject most modern technological advancements. And I do know that this group of Mennonites is directly tied to the Lancaster County community that Landis is from, and live by the same practices. They do not use electric lighting. They do not use cars--only horses, buggies, and bikes. (All the banks in my hometown, and even the McDonald's, have hitching posts in their parking lots.) They do allow tractors in the fields, but no rubber tires. They use electric refrigerators, ranges, and land-based phones, but that's the only use of electricity that I'm aware of. Computers are completely out of the question. (So clearly, either you're in a different group of Mennonites that have far different restrictions, or you're completely lying through your teeth. I'm going to assume the former.) Leather belts are not allowed on men or boys--nearly all use suspenders. Women and girls only wear full-length dresses/skirts--no pants. Shorts and any other clothing that exposes any part of the leg are prohibited, as are most "vibrant" colors.
Regarding Floyd Landis--Many of my Mennonite friends know or knew Floyd personally before they moved to Wisconsin, and have followed his career. When he first started competing (when he was still Mennonite), he wore sweatpants and had steel-rimmed bicycle wheels, to comply with his religious background. At first, he was primarily a mountain biker. As he succeeded more and more, and wanted to advance, he realized he needed to adopt modern biking practices (shorts, rubber tires, etc.) to do so--and it was about that time that he started leaving his Mennonite faith. (I obviously can't say whether it was biking that drove him from the Mennonite faith, or the two just coincided--only he could say, and the Mennonites I know have widely varying opinions on it.) He now lives in southern California.
It was revealed part way through this year's Tour that he has a badly damaged hip joint, which he's been suffering with for several years. It was bad enough that he was able to get a waiver to take cortizone injections for it. It's bad enough that, now that the Tour is over, he's likely going to have hip replacement surgery--after which it's unknown if he'll ever be able to compete again at this level. And from what I've heard, the damage was likely done 10-20 years ago--when he was training for and competing in mountain bike events on steel wheels.
Here's an article that my Mom sent to me. (My parents still live within two miles of the farm I grew up on, talk daily to the family that bought our farm, and last summer they visited Lancaster County while traveling out east and met relatives of lots of people they know.) Like most news stories written by a reporter who comes in wholly unfamiliar with the subject they're reporting on, there are some points it doesn't quite get right--but the general gist of Landis'