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 ?
Basso Astra 2026 geometry in sizes 45–61: stack 538.9–650.4 mm, reach 371.1–385.5 mm, head angle 71.8–74°.
| 45 | 48 | 51 | 53 | 56 | 58 | 61 | |
|---|---|---|---|---|---|---|---|
| Stack | 538.9 mm | 538.9 mm | 563.4 mm | 575.9 mm | 602.4 mm | 625.4 mm | 650.4 mm |
| Reach | 371.1 mm | 371.1 mm | 374.5 mm | 380.4 mm | 382.1 mm | 384.4 mm | 385.5 mm |
| Head angle | 71.8° | 71.8° | 72° | 72.3° | 73.5° | 73.5° | 74° |
| Seat angle | 76° | 75° | 75° | 74° | 73.5° | 73° | 72.5° |
| Seat tube (c-t) | 450 mm | 480 mm | 510 mm | 530 mm | 560 mm | 580 mm | 610 mm |
| Head tube | 125 mm | 125 mm | 150 mm | 162 mm | 180 mm | 204 mm | 228 mm |
| Top tube (effective) | 505 mm | 515 mm | 525 mm | 545 mm | 560 mm | 575 mm | 590 mm |
| Chainstay | 404 mm | 404 mm | 404 mm | 404 mm | 406 mm | 410 mm | 410 mm |
| Stock build by size | |||||||
| Stem | 80 mm | 90 mm | 100 mm | 110 mm | 110 mm | 120 mm | 120 mm |
| Stem angle | −8° | −8° | −8° | −8° | −8° | −8° | −8° |
| Bar width | 400 mm | 400 mm | 420 mm | 420 mm | 420 mm | 420 mm | 440 mm |
| Seatpost setback | 15 mm | 15 mm | 15 mm | 15 mm | 15 mm | 15 mm | 15 mm |
Source: bassobikes.com, checked 1 Nov 2026 · bar position: worked out from published data
Older model years in the archive with the same stack, reach and head angle: 2023–2025. Source: bassobikes.com
Stock build
Astra 23 – Shimano Ultegra 8170 Di2 €4,699
- Groupset
- Shimano Ultegra Di2 2×12
- Shifters
- Shimano Ultegra Di2 (R8170)
- Stem
- Levita integrated
- Handlebar
- Levita Integrated Carbon handlebar
- Seatpost
- Astra seatpost
- List price
- €4,699 (bassobikes.com, 1 Nov 2026)
Options when ordering (manufacturer’s default in bold):
| Size | Cockpit | Stem | Bar width | Cranks |
|---|---|---|---|---|
| all | integrated cockpit Levita Carbon integrated cockpit Levita Carbon integrated cockpit Levita Carbon integrated cockpit Levita Carbon integrated cockpit Levita Carbon | 90, 100, 110, 120 mm | 400, 420, 440 mm | 170, 172.5, 175 mm |
Astra 23 – Shimano 105 Di2 €3,699
- Groupset
- Shimano 105 Di2 2×12
- Shifters
- Shimano 105 Di2 (R7170)
- Stem
- Paradigma Stem
- Handlebar
- Microtech All Road Handlebar
- Seatpost
- Astra seatpost
- List price
- €3,699 (bassobikes.com, 1 Nov 2026)
Options when ordering (manufacturer’s default in bold):
| Size | Stem | Bar width |
|---|---|---|
| all | 80, 90, 100, 110, 120, 130 mm | 400, 420, 440 mm |
Source for all builds: bassobikes.com, checked 1 Nov 2026
Frames with similar geometry
Stack and reach within 12 mm of size 45 (stack 538.9 / reach 371.1 mm).
Stack and reach within 12 mm of size 48 (stack 538.9 / reach 371.1 mm).
Stack and reach within 12 mm of size 51 (stack 563.4 / reach 374.5 mm).
Stack and reach within 12 mm of size 53 (stack 575.9 / reach 380.4 mm).
Stack and reach within 12 mm of size 56 (stack 602.4 / reach 382.1 mm).
Stack and reach within 12 mm of size 58 (stack 625.4 / reach 384.4 mm).
Stack and reach within 12 mm of size 61 (stack 650.4 / reach 385.5 mm).
Spotted a mistake or a missing build? Let me know.
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