J. S. owner of luxe Wheelworks. J.B. staff of signature cycles.
Now of course these guys might be having a huge vested interest or don't know their stuff, but that's not the impression I have
Oh and heck, Ergott isn't to hot on the F20 as a rear wheel (on any rider weight)
unless he reversed that opinion
So there we have it, Mavic versus Ambrosio isn't so one sided as some here make it out to be. People as Coloclimber don't like them much, Ergott advices the heavy rear rim. On VS there are experienced wheelbuilders going for Reflex. Call me crazy, but I'd say it's more of a toss up than anything else.
Justin and I have sold each other rims and components over the years. I've ridden his wheels and possibly vice versa. And I've bought from the Signature guys. The point is, in fact, that nothing is absolute. However, this comparison was between Nemesis and Reflex, and I think this thread has clarified the issues they each have. I'm not trying to win any argument here. I'm just sharing the factual info I have. Why does a builder like a rim or not? Usually it's a matter of whether it builds well without complications and the customer is happy with it. If a rider has to deal with brake blocks chafing on the tire sidewall because the braking surface on the rim is too shallow, does that get blamed on the rim? Oddly enough, usually not. And most riders don't ride hard enough on tubulars to stress them enough -- straight lines, slow speeds, fat cushy tires, and no hard banking, no hard racing, whatever. You can put most riders on anything and they won't break it. But if you watched the last several years of Paris Roubaix, you saw almost exclusively Nemesis rims and very rarely Reflexes. Even the Mavic wheels on the service motorcycles are built with either old Mavic Paris Roubaix rims or with Nemesis rims -- not Reflexes.
It's very hard on a wheelbuilder or a dealer to promote rims they can't get, and Ambrosio Nemesis rims are pretty consistently hard to find. That alone makes builders favor other rims. If the builder wants to promote offset spoke drillings for rear wheels, or wants to put riders on lighter wheels, or prefers deeper section rims like Kinlin XR300's, neither a Nemesis nor a Reflex will measure up. As I talk with many/most of the professional wheelbuilders today, they like rims that are available and also reliable. Kinlin and Velocity are winning that battle over everyone else. And of course builders prefer building with carbon rims like Enve. The point is that choices are sometimes pragmatic and have nothing to do with the actual rim itself, or are based on the audience the builder is creating wheels for. Look at the European racing circuit and ask how many Reflexes are being used, in a market that is pretty strongly influenced by Mavic, and you should be able to read between the lines.
Let's all stop trying to convince somebody about one rim or another. The facts are out. Everyone needs to make their own decision. Hell, people want equipment because some pro rides it, or wants a frame size because it looks good on someone else. Jeez, I don't need to argue anyone into anything. Let's let it rest.