I have come by a pair of Continental Podiums (tubulars) 27 " , the seller told me they are the same as 700c . Even though they are marked 27" I'm sure they are 26" - 650c something like that , I'm not at all familiar with 650's , I thought if anything they would be to big , I have a 700c tubular and I laid it on top of the Conti ,and the difference was clear . . There is a lot of info on Sheldon's site , the first thing they say is there is a lot of confusion out there about 27"s but most of it is about older tires . My tires aren't that old . So question , what have I got ? Thanks , Mark .