How will taller bike affect reach?

I ride a 54 c-c frame, 73 degree seat and head tube angles, with a 55cm top tube and 10cm -17
degree stem.

If I go to a 56 c-c frame with same angles but 56cm top tube and 10cm stem, how much difference will
there be in the reach with the 56 c-c vs. the 54 c-c?

"frank121" <frank121@cox.netNOSPAM> wrote in message
news:f4%hb.30008$Qo.23946@news2.central.cox.net...
> I ride a 54 c-c frame, 73 degree seat and head tube angles, with a
55cm top
> tube and 10cm -17 degree stem.
>
> If I go to a 56 c-c frame with same angles but 56cm top tube and 10cm
stem,
> how much difference will there be in the reach with the 56 c-c vs. the
54
> c-c?

The obvious answer is 1 cm longer. What can affect this is the height of the head tube. With a
taller frame, the head tube is longer and so stem minimum height is now higher which could alter
your existing geometry. One of the reasons the pros typically race on smaller frames is to get as
low as possible on the front with less frame material.

Phil Holman

"frank121" <frank121@cox.netNOSPAM> writes:

> I ride a 54 c-c frame, 73 degree seat and head tube angles, with a 55cm top tube and 10cm -17
> degree stem.
>
> If I go to a 56 c-c frame with same angles but 56cm top tube and 10cm stem, how much difference
> will there be in the reach with the 56 c-c vs. the 54 c-c?

Somewhere between 5 and 10 mm, depending on whether the taller frame puts your bars up higher. If
your bars are higher (by, say, 2 cm) then you will find that they also come back towards the saddle
a little bit. Some simple geometry will tell you how much. If you put the bars down to the same
height, relative to the saddle, then the bars will be about 1 cm further away as Phil Holman wrote.