Good to know: Integrated cockpit · Configurable build
Integrated cockpit (a one-piece bar and stem) on at least one build. Changing the length means replacing the whole cockpit, and not every length exists. Check which length the bike actually ships with before you buy.
Configurable build (at least partly: the cockpit or bar width, for example). The stock build below is only one of the options.
Geometry ?
ARC8 Eero 2026 geometry in sizes S–XL: stack 545–618 mm, reach 364–400 mm, head angle 70–71°.
| S | M | L | XL | |
|---|---|---|---|---|
| Stack | 545 mm | 568 mm | 593 mm | 618 mm |
| Reach | 364 mm | 376 mm | 388 mm | 400 mm |
| Head angle | 70° | 71° | 71° | 71° |
| Seat angle | 73.5° | 73.5° | 73.5° | 73.5° |
| Seat tube (?) | 510 mm | 550 mm | 570 mm | 600 mm |
| Head tube | 137 mm | 157 mm | 170 mm | 197 mm |
| Top tube (effective) | 525 mm | 545 mm | 564 mm | 583 mm |
| BB drop | 75 mm | 75 mm | 75 mm | 75 mm |
| Chainstay | 420 mm | 420 mm | 420 mm | 420 mm |
| Wheelbase | 1002 mm | 1012 mm | 1032 mm | 1053 mm |
| Standover | 774 mm | 809 mm | 830 mm | 858 mm |
| Fork length | 395 mm | 395 mm | 395 mm | 395 mm |
| Fork offset | 50 mm | 50 mm | 50 mm | 50 mm |
| Stock build by size | ||||
| Stem | 90 mm | 90 mm | 100 mm | 110 mm |
| Bar width | 400 mm | 400 mm | 420 mm | 420 mm |
| Seatpost setback | 0 mm | 0 mm | 0 mm | 0 mm |
(?) by the seat tube length: the manufacturer doesn’t say whether it’s measured centre to centre (c-c) or centre to top (c-t).
Source: arc8bicycles.com, checked 7 Nov 2026 · bar position: worked out from published data
Stock build
Eero RED XPLR €8,999
- Groupset
- SRAM Red XPLR AXS 1×13, 42T
- Shifters
- SRAM Red AXS E1
- Stem
- ARC8 ICH Stem
- Handlebar
- ARC8 alloy handlebar, flare 8°
- Seatpost
- Faserwerk Wuthocker, 0 mm offset
- List price
- €8,999 (arc8bicycles.com, 7 Nov 2026)
Eero Force XPLR AXS 1x13 €5,599
- Groupset
- SRAM Force XPLR AXS 1×13, 42T
- Shifters
- SRAM Force AXS E1
- Stem
- ARC8 ICH Stem
- Handlebar
- ARC8 alloy handlebar, flare 8°
- Seatpost
- Faserwerk Wuthocker, 0 mm offset
- List price
- €5,599 (arc8bicycles.com, 7 Nov 2026)
Eero GRX Di2 2x12 €5,599
- Groupset
- Shimano GRX RX825 Di2 2×12, 48/31
- Shifters
- Shimano GRX Di2 ST-RX825
- Stem
- ARC8 ICH Stem
- Handlebar
- ARC8 alloy handlebar, flare 8°
- Seatpost
- Faserwerk Wuthocker, 0 mm offset
- List price
- €5,599 (arc8bicycles.com, 7 Nov 2026)
Eero GRX Di2 1x12 €5,499
- Groupset
- Shimano GRX Di2 1×12, 42T
- Shifters
- Shimano GRX Di2 ST-RX825
- Stem
- ARC8 ICH Stem
- Handlebar
- ARC8 alloy handlebar, flare 8°
- Seatpost
- Faserwerk Wuthocker, 0 mm offset
- List price
- €5,499 (arc8bicycles.com, 7 Nov 2026)
Eero GRX 2x12 €4,799
- Groupset
- Shimano GRX RX820 2×12, 48/31
- Shifters
- Shimano GRX ST-RX820
- Stem
- ARC8 ICH Stem
- Handlebar
- ARC8 alloy handlebar, flare 8°
- Seatpost
- Faserwerk Wuthocker, 0 mm offset
- List price
- €4,799 (arc8bicycles.com, 7 Nov 2026)
Eero GRX 1x12 €4,399
- Groupset
- Shimano GRX RX820 1×12, 42T
- Shifters
- Shimano GRX ST-RX820
- Stem
- ARC8 ICH Stem
- Handlebar
- ARC8 alloy handlebar, flare 8°
- Seatpost
- Faserwerk Wuthocker, 0 mm offset
- List price
- €4,399 (arc8bicycles.com, 7 Nov 2026)
Options when ordering (manufacturer’s default in bold):
| Size | Stem | Bar width |
|---|---|---|
| S | 70, 80, 90, 100, 110, 120 mm | 360, 380, 400, 420, 440 mm |
| M | 70, 80, 90, 100, 110, 120 mm | 360, 380, 400, 420, 440 mm |
| L | 70, 80, 90, 100, 110, 120 mm | 360, 380, 400, 420, 440 mm |
| XL | 70, 80, 90, 100, 110, 120 mm | 360, 380, 400, 420, 440 mm |
Source for all builds: arc8bicycles.com, checked 7 Nov 2026
Frames with similar geometry
Stack and reach within 12 mm of size S (stack 545 / reach 364 mm).
Stack and reach within 12 mm of size M (stack 568 / reach 376 mm).
Stack and reach within 12 mm of size L (stack 593 / reach 388 mm).
Stack and reach within 12 mm of size XL (stack 618 / reach 400 mm).
Spotted a mistake or a missing build? Let me know.