for a 700c build (not measured yet), and not by the box.
ta
Bike shop.
CRC do them individually as well but any decent bike shop should have them. My local Halfords even carry them in the vast majority of sizes.
you using them on the back?
You will get a lot of twist using Revolutions on a 700c wheel. According to Roger M's wheel-building book he wouldn't recommend it.
Try
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Unless you are a heavy weight rider they will be fine on the non-drive side - use DT Comps on drive side.