Here’s a new overlay showing a 58cm Civia Bryant superimposed over a 60cm Rivendell Sam Hillborne. The Civia has a “downsloping” top tube, meaning the size is measured along the seat tube from the bottom bracket to a theoretical top tube above the actual top tube. The Rivendell, on the other hand, has an “upsloping” top tube, meaning the size is a true measurement to the top tube, with the top tube sloping uphill from there. That difference in measuring methods explains the greater than 2cm difference in size between these frames even though they list as 2cm apart on a spec sheet. It’s also interesting to note that because of the difference in handlebar set-ups, the smaller bike has a slightly longer reach to the bars. The moral of the story? There’s the numbers, then there’s the actual bikes and how they fit; don’t confuse the two.