1998 Principia Gaia Base
- Category
- Performance Road
- 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 ScaleCategory Trend
Performance RoadSource:http://www.starbike.com/images/Principia/geo_road.htm