Good to know: Configurable build
Configurable build (at least partly: the cockpit or bar width, for example). The stock build below is only one of the options.
Geometry ?
Isaac Hadron GT 2027 geometry in sizes XS–XL: stack 529.4–604.2 mm, reach 365.4–397 mm, head angle 70–71°.
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| Stack | 529.4 mm | 547.5 mm | 561.7 mm | 580.6 mm | 604.2 mm |
| Reach | 365.4 mm | 370.1 mm | 379 mm | 388 mm | 397 mm |
| Head angle | 70° | 71° | 71° | 71° | 71° |
| Seat angle | 74° | 73° | 73° | 72.5° | 72.5° |
| Seat tube (c-t) | 450 mm | 490 mm | 520 mm | 540 mm | 560 mm |
| Head tube | 110 mm | 125 mm | 140 mm | 160 mm | 185 mm |
| Top tube (effective) | 517 mm | 537.5 mm | 550.7 mm | 571.1 mm | 587.9 mm |
| BB drop | 69 mm | 69 mm | 69 mm | 69 mm | 69 mm |
| Chainstay | 435 mm | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1021.1 mm | 1022.4 mm | 1036.4 mm | 1051.8 mm | 1068.9 mm |
| Standover | 746.3 mm | 773.2 mm | 794.6 mm | 813.2 mm | 834.3 mm |
| Fork length | 399 mm | 399 mm | 399 mm | 399 mm | 399 mm |
| Fork offset | 55 mm | 55 mm | 55 mm | 55 mm | 55 mm |
| Stock build by size | |||||
| Cranks | 165 mm | 170 mm | 170 mm | 172.5 mm | 172.5 mm |
| Stem | 80 mm | 90 mm | 100 mm | 100 mm | 110 mm |
| Stem angle | −8° | −8° | −8° | −8° | −8° |
| Bar width | 380 mm | 380 mm | 400 mm | 400 mm | 420 mm |
Source: isaac-cycle.cz, checked 2 Nov 2026 · bar position: worked out from published data
Stock build
Hadron GT Shimano GRX 610/820 2x12 ≈ €2,700
- Groupset
- Shimano GRX RX610/RX820 2×12
- Shifters
- Shimano GRX ST-RX610
- Cranks
- 170 mm stock (165/172.5)
- Stem
- Isaac
- Handlebar
- Isaac
- List price
- 67,490 CZK (isaac-cycle.cz, 2 Nov 2026)
Hadron GT Shimano GRX 825 Di2 2x12
- Groupset
- Shimano GRX RX825 Di2 2×12
- Shifters
- Shimano GRX Di2 ST-RX825
- Cranks
- 170 mm stock
- Stem
- Isaac
- Handlebar
- Isaac
Options when ordering (manufacturer’s default in bold):
| Size | Stem |
|---|---|
| all | 80, 90, 100, 110, 120 mm |
Source for all builds: isaac-cycle.cz, checked 2 Nov 2026
Frames with similar geometry
Stack and reach within 12 mm of size XS (stack 529.4 / reach 365.4 mm).
Stack and reach within 12 mm of size S (stack 547.5 / reach 370.1 mm).
Stack and reach within 12 mm of size M (stack 561.7 / reach 379 mm).
Stack and reach within 12 mm of size L (stack 580.6 / reach 388 mm).
Stack and reach within 12 mm of size XL (stack 604.2 / reach 397 mm).
Spotted a mistake or a missing build? Let me know.