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Since they're both presumably horizontal top tubes, just ask sellers for top tube lengths. It's a more relevant measure of frame size.
The official sizing goes from the centre of the BB to the top tube but some sellers just measure all the way to the top and then give you the wrong size.
Also just find photos of 58s online and then compare the photos to the ones you're looking at buying. I usually use the size of the distance between the top and down tubes on the head tube as an easy reference point to guess sizes
PhilDAS
@1561
Can someone please shed some light on what should be quite a simple answer.
I'm going fucking mental trying to determine the frame size of CAAD (made in USA) frames online, either through Facebook or eBay sellers.
Do Cannondale measure the frame in the same way a 'traditional' road bike frame is measured, i.e, seatpost ctc (centre of crank, up the seat tube to the centre of where the toptube meets the seat tube)?
I currently ride a 58cm Columbus SL frame and am trying to determine if a 58cm Cannondale CAAD 5 would be the right size?
Thanks