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Road Bike Geometery: help me understand this chart...

Jan. 2, 2014, 9:09 a.m.
Posts: 1075
Joined: May 4, 2006

I'm looking out for a new road bike. It will be used for winter training (I'm considering discs), commuting and long distance/overnighters (it must have fender [HTML_REMOVED] rack mounts).

The first bike I'm looking at is the Cannondale Synapse Disc (probably the 105 model), however, there's a couple of entries on the geometry chart I can't figure out

This is what I presume the letters mean:
A Effective Top Tube Length
B Seat Tube Length
C Seat Tube Angle
D Head Tube Angle
E Chain Stay Length
F ?
G BB Height
H Wheelbase Length
I ?
J Standover Height
K ?
L ?
M Head Tube Length
N BB to TT height
O ?

Can someone fill in the gaps in my knowledge (eg what are F, I, K, L [HTML_REMOVED] O)?

Jan. 2, 2014, 11:58 a.m.
Posts: 1081
Joined: Jan. 1, 2011

F Fork offset
I Trail
K BB drop
L Front Centre
O Reach

Ride, don't slide.

Jan. 2, 2014, 2:23 p.m.
Posts: 1075
Joined: May 4, 2006

Thanks ColiAir…now off to find what my current bikes measurements are and then figure out the important details…

Jan. 3, 2014, 8:49 a.m.
Posts: 5731
Joined: June 24, 2003

N is stack. Stack and reach is a relatively new way to describe a frame size. Since the saddle is positioned relative to the bb it makes sense to measure frame size from this point. TT measurements are somewhat meaningless as seat tube angle varies. For example my Scott road bike had a 51 TT but I needed a 35 mm set back seat post on the 75 seat tube angle to fit right whereas my 53 TT Giant has a 74 seat tube angle and a 25 mm offset post works.

Debate? Bikes are made for riding not pushing.

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