Originally Posted by
HardyWeinberg
'horizontal' TT approximates 'effective' TT; the 56 CC is a 5mm shorter than 56 Tarmac, but the 54s are about equivalent.
If you're wondering how/why tube lengths do/don't line up, you would also want to look at changes in headtube or seat tube angle across sizes of each frame.
Thanks so much, I just wonder how people get the correct frame when they order online and don't have a chance to ride the bike; it really takes time to compare frame dimensions. Are most folks as cautious as I am or do a good many folks just buy a frame then hope it fits correctly?
I just don’t want to spend the money on a frame, spend the time building it up (this will be my first build so it may take me a while, kinda’ of a hobby/labor of love) then find it doesn’t fit properly.