yours is the 725 so if its red-105 groupset..
The 755 has 600 groupset
They ride really well-not super light by todays standards but lovely all the same.
from hillary stone site.....
RALEIGH DYNATECH ROAD FRAME 1990
Seat Tube (ctt): 23.5in (59cm)
Top Tube (ctc): 22.25in (56.5cm)
Rear dropout width: 126mm
Wheel size: 700C/sprints with brake drop of 47mm
Seatpost size: 27.2mm
This Raleigh Dynatech road frame is from the first year of...