No. That is incorrect. If you use cranks with a 19mm (3/4") spindle (Profile Race, Odyssey 41 Thermal, etc), the standard American-sized bearing (R12) and spacer will fit into the Mid. However, if you use a crank with a 22mm spindle (Primo, Odyssey Wombolt, etc), you need to get special bearings with the same outer diameter as the R12, but with a spindle hole of a larger size. Most mailorders will have these bearings for sale, with the proper spacer.
In my opinion, Mid and American are the way to go, because the bearings have been proven to be strong over the years. Spanish bearings may be larger than the Euros, but they're not as thick as the Mid bearings and aren't as beefy. And Euro... well, Euro just blows; I blew out to sets of bearings in a a 1-3/4 years.
Last edited by CMcMahon; 01-28-06 at 02:01 PM.