Originally Posted by
Iride01
Likewise I wouldn't expect a big difference in saddle height due to going to clipless. It's not been anything I've ever been concerned with. Maybe at most a silly centimeter longer.
That's the thing. Compared with my current flat pedal setup, even with the tall mast at maximum extension (78.5cm) AND 175mm cranks, there's only a silly cm of extra extension available compared to what I'm riding now.
Originally Posted by
Iride01
I don't know how you should base choices you got and they don't specifically say online. These are for the 58 cm frame.
Saddle rail height min (w/short mast) 69.0
Saddle rail height max (w/short mast) 75.0
Saddle rail height min (w/tall mast) 72.5
Saddle rail height max (w/tall mast) 78.5
I noted the fourth number here (78.5) in my second post above. I will have the tall mast extended pretty much to the max, so the other three numbers are not relevant to my situation.
Originally Posted by
Iride01
I sort of assume that with the they are the min max you can get measured to the BB then you have to add in the crank length and the height from saddle rails to top of saddle.
Yes, its BB to saddle rail. Confirmed this at a Trek shop yesterday.
Originally Posted by
Iride01
My 56 cm Tarmac is currently at 73.6 cm between the rails and BB. I'm 180 cm with 87.6 cm inseam. So that sort of makes sense what Giant is showing.
As I noted in my second post above, my current bike is 78cm between the rails and BB. Compared to you, I have an extra 4.4cm of inseam and my saddle rails are 4.4cm higher. Lines up perfectly with your numbers, but I'm on flat pedals with thin sole shoes and still haven't factored in increased pedal stack height due to cleats.
Originally Posted by
Iride01
You can simply measure your current bike if the saddle height is to your liking from the bb to the rails. Since your cranks are 170, then for the bike with 175 mm cranks you need to take 5 mm off whatever you measure.
I did measure my current bike. 78cm from BB to saddle rails as noted above. I'm probably going to need that extra 5mm from the 175mm cranks.
Originally Posted by
Iride01
The issue I see is that if the bike comes with 175 mm cranks, then you might be better off with the short mast. If you are going to change them to 170 mm cranks later, then you might need the tall mast as shorter cranks mean taller saddle height.
The short mast will definitely NOT WORK for me. Way too short.
Originally Posted by
Iride01
I wouldn't sweat the clipless/flat pedal thing though. I'd actually doubt it's the cm more I mentioned. Though again, I've never thought to concern myself with it.
That's the thing. Compared with my current flat pedal setup, even with the tall mast at maximum extension (78.5cm) AND 175mm cranks, there's only a silly cm of extra extension available.
I should have just asked about differences in stack height between flat pedals vs clipless. I know all the other variables but don't know these.