2026 2026 Polygon Helios A8 Di2 Polygon Base
- Category
- Performance Road
- Design
- Drop Bar, Rigid, non-suspension corrected
- Frame
- Carbon/Composite
- Fork
- Carbon/Composite
- Features
- Disc brake
Average stack and reachvs category | Somewhat aggressive stack and reachvs category | Somewhat aggressive stack and reachvs category | Somewhat aggressive stack and reachvs category | Very aggressive stack and reachvs category | Somewhat aggressive stack and reachvs category | Very aggressive stack and reachvs category |
Geometry
XXXS | XXS | XS | S | M | L | XL | |
Stack | 493mm | 503mm | 511mm | 523mm | 533mm | 551mm | 571mm |
Reach | 370mm | 375mm | 385mm | 390mm | 400mm | 405mm | 420mm |
Stack to Reach Ratio | 1.33:1 | 1.34:1 | 1.33:1 | 1.34:1 | 1.33:1 | 1.36:1 | 1.36:1 |
Seat Tube Length, C-T | 395mm | 420mm | 457mm | 489mm | 499mm | 518mm | 536mm |
Top Tube Length, Effective/Horizontal Center | 502mm | 513mm | 529mm | 540mm | 556mm | 570mm | 598mm |
Top Tube Slope | 13.3deg | 11.4deg | 8deg | 5.8deg | 5.7deg | 5.7deg | 5.8deg |
Head Tube Angle | 71deg | 71.3deg | 71.5deg | 72.3deg | 72.5deg | 72.8deg | 73deg |
Seat Tube Angle | 75deg | 74.7deg | 74.3deg | 74deg | 73.7deg | 73.3deg | 73deg |
Head Tube Length | 90mm | 100mm | 110mm | 120mm | 130mm | 150mm | 170mm |
Bottom Bracket Drop | 78mm | 78mm | 75.5mm | 73mm | 73mm | 71.5mm | 71.5mm |
Bottom Bracket Height | 261mm | 261mm | 263.5mm | 266mm | 266mm | 267.5mm | 267.5mm |
Chainstay Length | 410mm | 410mm | 410mm | 410mm | 410mm | 410mm | 410mm |
Chainstay Length Horizontal | 402.5mm | 402.5mm | 403mm | 403.5mm | 403.5mm | 403.7mm | 403.7mm |
Front-Center | 571.8mm | 578.8mm | 589.9mm | 586.1mm | 597mm | 605.5mm | 624.4mm |
Front-Center Horizontal | 566.5mm | 573.5mm | 585mm | 581.6mm | 592.6mm | 601.3mm | 620.3mm |
Wheelbase | 969mm | 976mm | 988mm | 985mm | 996mm | 1005mm | 1024mm |
Fork Offset/Rake | 50.7mm | 51.8mm | 51.5mm | 45.7mm | 45.3mm | 45.7mm | 45.5mm |
Trail | 63.1mm mid/​neutral | 60.1mm mid/​neutral | 59.1mm mid/​neutral | 60.3mm mid/​neutral | 59.4mm mid/​neutral | 57.1mm mid/​neutral | 56.1mm mid/​neutral |
Mechanical Trail | 59.7mm | 56.9mm | 56.1mm | 57.4mm | 56.6mm | 54.5mm | 53.6mm |
Wheel Flop | 19.4mm | 18.3mm | 17.8mm | 17.5mm | 17mm | 16.1mm | 15.7mm |
Standover Height | 662mm | 685mm | 720mm | 752mm | 761mm | 780mm | 799mm |
Tire to Pedal Spindle | 62.8mm 170 mm cranks | 69.8mm 170 mm cranks | 80.9mm 170 mm cranks | 77.1mm 170 mm cranks | 88mm 170 mm cranks | 96.5mm 170 mm cranks | 115.4mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 91mm 170 mm cranks | 91mm 170 mm cranks | 93.5mm 170 mm cranks | 96mm 170 mm cranks | 96mm 170 mm cranks | 97.5mm 170 mm cranks | 97.5mm 170 mm cranks |
Base Build
XXXS | XXS | XS | S | M | L | XL | |
Wheel Size | 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 | 28mm | 28mm | 28mm | 28mm | 28mm | 28mm | 28mm |
Tire Width Max | 34mm | 34mm | 34mm | 34mm | 34mm | 34mm | 34mm |
Tire Outer Diameter | 678mm | 678mm | 678mm | 678mm | 678mm | 678mm | 678mm |
Bike Length with Tires | 1647mm | 1654mm | 1666mm | 1663mm | 1674mm | 1683mm | 1702mm |
Handlebar Width | 400mm | 400mm | 400mm | 420mm | 420mm | 440mm | 440mm |
Stem Length | 90mm | 100mm | 100mm | 110mm | 110mm | 120mm | 120mm |
Stem Angle | -7.5deg | -7.5deg | -7.5deg | -7.5deg | -7.5deg | -7.5deg | -7.5deg |
Published Sizing Recommendations
Height | 143 cm to 153 cm | 151 cm to 161 cm | 154 cm to 164 cm | 162 cm to 170 cm | 168 cm to 176 cm | 174 cm to 181 cm | 180 cm to 187 cm |
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:https://www.polygonbikes.com/helios-a8-di2/