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 ?
Isaac Meson 2026 geometry in sizes XS–XL: stack 498.5–582.7 mm, reach 373.3–399 mm, head angle 71.5–74°.
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| Stack | 498.5 mm | 522.9 mm | 544.2 mm | 564.7 mm | 582.7 mm |
| Reach | 373.3 mm | 379.4 mm | 384.4 mm | 392.3 mm | 399 mm |
| Head angle | 71.5° | 74° | 73.3° | 73.2° | 73.3° |
| Seat angle | 74.5° | 74° | 73.5° | 73° | 73.5° |
| Seat tube (c-t) | 444.7 mm | 474.8 mm | 505.4 mm | 531.9 mm | 564.1 mm |
| Head tube | 91 mm | 114 mm | 133.4 mm | 155 mm | 176 mm |
| Top tube (effective) | 511.6 mm | 529.3 mm | 545.6 mm | 565 mm | 571.6 mm |
| BB drop | 74 mm | 74 mm | 71.5 mm | 71.5 mm | 69 mm |
| Chainstay | 410 mm | 410 mm | 410 mm | 410 mm | 410 mm |
| Wheelbase | 970.3 mm | 977.8 mm | 974.8 mm | 989.4 mm | 1001.6 mm |
| Fork offset | 49 mm | 49 mm | 43 mm | 43 mm | 43 mm |
Source: isaac-cycle.cz, checked 2 Nov 2026 · bar position: worked out from published data
Stock build
Meson Shimano 105 Di2 (Jade Green) ≈ €5,300
- Groupset
- Shimano 105 Di2 2×12
- Shifters
- Shimano 105 Di2 ST-R7170
- Cranks
- Shimano 105 Di2 (50/34, 172.5 mm stock; 170/172.5/175)
- Stem
- integrated
- Handlebar
- ISAAC Airflow Carbon
- List price
- 132,490 CZK (isaac-cycle.cz, 2 Nov 2026)
Options when ordering (manufacturer’s default in bold):
| Size | Stem | Bar width |
|---|---|---|
| all | 90, 100, 110, 120 mm | 380, 400, 420 mm |
Source: isaac-cycle.cz, checked 2 Nov 2026
Frames with similar geometry
Stack and reach within 12 mm of size XS (stack 498.5 / reach 373.3 mm).
Stack and reach within 12 mm of size S (stack 522.9 / reach 379.4 mm).
Stack and reach within 12 mm of size M (stack 544.2 / reach 384.4 mm).
Stack and reach within 12 mm of size L (stack 564.7 / reach 392.3 mm).
Stack and reach within 12 mm of size XL (stack 582.7 / reach 399 mm).
Spotted a mistake or a missing build? Let me know.