I think eshlwc is confusing himself. What rim diameter you build with be it 630/27" or 622/700c has nothing to do with the hub. You can use the same cool old hub for either. Hubs have NOTHING to do with what rims you use. I'd also disagree with him on the Campy record hubs. They use cups/cone/balls and the notion that they spin smoothly disregards the fact that you can't source new cups for vintage Campy hubs and replacement cones are nearly impossible to get and don't have the same heat treatment as the original kit. So if we lived in a universe where spares were still available, technically Campagnolo hubs could be used and kept smooth, IF kept in constant adjustment and maintained, and IF spare Cups, Cones and Balls were available. At this point in time most Campagnolo hubs are in a "death spiral." Every mile reduces the efficient effective lifespan. No amount of fresh grease and new balls can fix the scoring, galling, and wear of the Cups and the Cones. Even with new Cones and balls, the Cups quickly translate their galling, scoring, and wear to the balls and through to the cones. Its a literally death spiral or weakest chain in the link kind of thing. Kool vintage hubs like Mavic that used sealed bearings are a much better choice in my mind. They are lifetime hubs and a quick replacement of the sealed cartridge bearings literally returns them to an "as new" state of spin free of the characteristic grind of cup/cone/loose ball hubs.

Also echlwc again seems to be confused with his 32/36 drill comment. You can use any hub with either a 630/622 wheel build, the hub or the drilling has NOTHING to do with the wheel size.

Also it should be noted that a 622/700c wheel passes through more of the imperfections of the road (bumps, cracks, potholes, etc.) more so than its 4mm radial difference to a 630/27" wheel would suggest. That combined with the higher rolling resistance of narrow tires like he suggests with 23mm make for a bad combination.

Most of us are really recreational cyclists. We aren't riding on tubulars like Pros do. Clincher tires with high pressures and narrow widths actually are being found to have HIGHER rolling resistance than wider tires at the same pressures or wider tires at lower pressures. However, that won't stop most people from using narrow tires. Most cyclists on the road are on poorly fitting bikes that don't' fit them. They can only ride perched on top of the hoods because they like the look of an aggressive road geometry. Most of them, even 99% of them, couldn't ride half their weekly mileage in the drops of THEIR own road bike if you paid them. They truly don't fit a road bike in the size they think they do, and don't have the form, flexibility or fitness to ride drop bars in that given size. Its actually a bit hilarious. Most cyclists are recreational cyclists pretending to be road racing cyclists. They would be better off using mustache bars or a properly fitting frame size to the point that they could actually reach/ride in the drops. However, that wouldn't "look" as aggressive or have that pro-road look. The same is true for narrow clincher tires that are the poseur component if there ever was one. Narrow tires with tubulars are a whole different animal in terms of rolling resistance.

I like wider quality touring tyres by Continental or touring tires by Panaracer. I have some Schwalbe Marathon and Marathon Plus tires, but the Korean made Schwalbe tires aren't ever up to the same quality as the Panaracer tires, and strangely are always more expensive. For a go fast tire, the Panaracer Pasela is about as light and as fast as a tire as exists in a clincher. For a more durable tyre I love Contis but they don't make touring tyres in 35 width. I've tried to love Schwalbe tires but they are just never the same quality as the Contintental or Panaracer offerings. Which I find funny since both the German Conti and the Japanese Panaracer have basically the same manufacturing/importing expenses.

The only bike I ride that is 622/700c is my tandem, and only the rear wheel at that. We're a heavy team and needed a Velocity Chukker 48h wheel build (the strongest wheel as can be built), and even a vintage Mavic Module 4 630 would not have been strong enough. However, on the front we still run 630/27".

I've never once heard of a good enough reason to downgrade my wheels to 622 just because everyone else loves saying seven-hundred-c.