Originally Posted by
Kabuto
Well, I didn't want to go into too much detail because it'll probably just complicate the discussion.
But the crux of my question is ... am I going to have enough seat post with the bike I'm looking to purchase...
My height is 183cm, my cycling inseam is 92cm.
I'm looking at buying a 2021 size 58 Domane SL5.
This bike's maximum BB to saddle rail length with the "tall mast" seat post option is 78.5cm.
I don't have the bike yet, nor do I have clipless pedals/shoes.
On the bike I'm riding now, I have the BB to saddle rail distance set at 78cm.
I'm currently using flat pedals, and will move to clipless pedals with the new bike.
My current crank length is 170mm but is 175mm on the new bike.
Am I going to have enough saddle height with the size 58 Domane SL5 and clipless?
The reason I ask is I've never used clipless pedals. If the move to clipless requires less, no change, or up to 1cm extra saddle to pedal distance, the size 58 Domane will work (bike is in stock and I can get it immediately). If the move to clipless requires more than an extra 1cm of saddle to pedal distance, a size 60 Domane will get me an extra 2cm (special order, six month wait).
I personally don't expect the cleat attachment to add that much height, especially with you adding 5mm to the pedal to saddle distance.
The measurements you're providing are close, but still don't get the information needed to say yes or no. The measurement that matters is saddle surface to pedal surface, everything else is just a subdivision of that. I'm guessing that you don't know the girth of the saddle that will come on the bike, but in my experience it's usually around 5cm from the rails to the part you're sitting on. I'll also note that the cleat attachment can add some thickness to your shoe/pedal interface, but it's not likely to exceed 1 cm, especially if you aren't riding your flat pedals with minimalist 3-7mm thick soles.
My take is that you'll be fine on the 58, unless you like to ride frames as big as possible.