1998 Principia Gaia Base

Design
Drop Bar, Rigid, non-suspension corrected
Frame
Aluminum
Fork
Aluminum
Features
Rim brake
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category
Average stack and reachvs category
Somewhat upright stack and reachvs category
Very aggressive stack and reachvs category
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category

Geometry

46
49
51
53
57
55
59
61
63
Stack
471.3mm
500.2mm
519.5mm
538.8mm
575.9mm
538mm
595.1mm
612.8mm
630.3mm
Reach
363.6mm
379.3mm
383.1mm
384.9mm
388.1mm
401mm
395.7mm
398mm
400.9mm
Stack to Reach Ratio
1.3:1
1.32:1
1.36:1
1.4:1
1.48:1
1.34:1
1.5:1
1.54:1
1.57:1
Seat Tube Length, C-T
490mm
520mm
540mm
560mm
600mm
580mm
620mm
640mm
660mm
Top Tube Length, Effective/Horizontal Center
500mm
524mm
533mm
540mm
559mm
555mm
572mm
585mm
599mm
Top Tube Length, Actual C-C
500mm
524mm
533mm
540mm
559mm
555mm
572mm
585mm
599mm
Top Tube Slope
0deg
0deg
0deg
0deg
0deg
0deg
0deg
0deg
0deg
Head Tube Angle
72deg
72deg
72.5deg
73deg
73deg
73deg
73.5deg
73.5deg
73.5deg
Seat Tube Angle
74deg
74deg
74deg
74deg
73.5deg
74deg
73.5deg
73deg
72.5deg
Head Tube Length
98mm
98mm
98mm
113mm
157mm
132mm
177mm
195mm
213mm
Bottom Bracket Drop
27.5mm
67mm
67mm
67mm
67mm
63mm
67mm
67mm
67mm
Bottom Bracket Height
275mm
267mm
267mm
267mm
267mm
271mm
267mm
267mm
267mm
Chainstay Length
390mm
406mm
406mm
406mm
406mm
406mm
406mm
406mm
406mm
Chainstay Length Horizontal
389mm
400.4mm
400.4mm
400.4mm
400.4mm
401.1mm
400.4mm
400.4mm
400.4mm
Front-Center
557.7mm
576.5mm
582.4mm
584.4mm
595.4mm
595mm
600.3mm
605.3mm
613.2mm
Front-Center Horizontal
557mm
572.6mm
578.6mm
580.6mm
591.6mm
590.9mm
596.6mm
601.6mm
609.6mm
Wheelbase
946mm
973mm
979mm
981mm
992mm
992mm
997mm
1002mm
1010mm
Fork Offset/Rake
—
—
—
—
—
42.7mm
—
—
—
Trail
—
—
—
—
—
—
—
—
—
—
57.4mm
mid/​neutral
—
—
—
—
—
—
Mechanical Trail
—
—
—
—
—
54.9mm
—
—
—
Wheel Flop
—
—
—
—
—
16.1mm
—
—
—
Tire to Pedal Spindle
85.2mm
170 mm cranks
72.5mm
170 mm cranks
78.4mm
170 mm cranks
80.4mm
170 mm cranks
91.4mm
170 mm cranks
91mm
170 mm cranks
96.3mm
170 mm cranks
101.3mm
170 mm cranks
109.2mm
170 mm cranks
Pedal Spindle to Ground Clearance
105mm
170 mm cranks
97mm
170 mm cranks
97mm
170 mm cranks
97mm
170 mm cranks
97mm
170 mm cranks
101mm
170 mm cranks
97mm
170 mm cranks
97mm
170 mm cranks
97mm
170 mm cranks

Base Build

46
49
51
53
57
55
59
61
63
Wheel Size
26 in
559 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
Tire Width
23mm
23mm
23mm
23mm
23mm
23mm
23mm
23mm
23mm
Tire Width Max
23mm
23mm
23mm
23mm
23mm
23mm
23mm
23mm
23mm
Tire Outer Diameter
605mm
668mm
668mm
668mm
668mm
668mm
668mm
668mm
668mm
Bike Length with Tires
1551mm
1641mm
1647mm
1649mm
1660mm
1660mm
1665mm
1670mm
1678mm
Crank Length
—
—
—
—
—
170mm
—
—
—
Handlebar Width
—
—
—
—
—
40mm
—
—
—
Stem Length
—
—
—
—
—
80mm
—
—
—
Stem Angle
—
—
—
—
—
-17deg
—
—
—

Published Sizing Recommendations

PBH
—
76 cm
to
79 cm
77.5 cm
to
82 cm
80.5 cm
to
84.5 cm
86 cm
to
89.5 cm
83.5 cm
to
87 cm
88.5 cm
to
92 cm
91 cm
to
94.5 cm
93.5 cm
to

Stack and Reach vs. Category Trend

Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Learn more about the Upright/Aggressive Scale
Category Trend
Performance Road
Source:http://www.starbike.com/images/Principia/geo_road.htm