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 Vitron GT 2027 geometry in sizes XXS–XL: stack 510–597 mm, reach 352–380 mm, head angle 70.2–72.4°.
| XXS | XS | S | M | L | XL | |
|---|---|---|---|---|---|---|
| Stack | 510 mm | 525 mm | 542 mm | 559 mm | 578 mm | 597 mm |
| Reach | 352 mm | 362 mm | 366 mm | 370 mm | 375 mm | 380 mm |
| Head angle | 70.2° | 71.3° | 71.6° | 72.1° | 72.4° | 72.4° |
| Seat angle | 74.8° | 74.5° | 74.3° | 74° | 73.5° | 73° |
| Seat tube (c-t) | 450 mm | 470 mm | 490 mm | 520 mm | 540 mm | 560 mm |
| Head tube | 107.3 mm | 118.9 mm | 135.7 mm | 153.1 mm | 171.9 mm | 191.8 mm |
| Top tube (effective) | 490.2 mm | 507.2 mm | 517.9 mm | 530.4 mm | 546.3 mm | 562.6 mm |
| BB drop | 78 mm | 78 mm | 78 mm | 75 mm | 75 mm | 75 mm |
| Chainstay | 415 mm | 415 mm | 415 mm | 415 mm | 415 mm | 415 mm |
| Wheelbase | 971.6 mm | 977.1 mm | 983.9 mm | 984.9 mm | 993 mm | 1004 mm |
| Standover | 715 mm | 732.5 mm | 749.2 mm | 775.6 mm | 791.6 mm | 805.2 mm |
| Fork length | 370 mm | 370 mm | 370 mm | 370 mm | 370 mm | 370 mm |
| Fork offset | 53 mm | 53 mm | 53 mm | 48 mm | 48 mm | 48 mm |
| Stock build by size | ||||||
| Cranks | – | 165 mm | 170 mm | 172.5 mm | 172.5 mm | 172.5 mm |
| Stem | – | 80 mm | 90 mm | 90 mm | 100 mm | 100 mm |
| Stem angle | – | −8° | −8° | −8° | −8° | −8° |
| Bar width | – | 380 mm | 380 mm | 400 mm | 400 mm | 420 mm |
| Seatpost setback | – | 10 mm | – | – | – | – |
Source: isaac-cycle.cz, checked 2 Nov 2026 · bar position: worked out from published data
Stock build
Vitron GT Shimano 105 ≈ €2,600
- Groupset
- Shimano 105 2×12
- Shifters
- Shimano 105 ST-R7120
- Cranks
- 50/34 170 mm stock (165/172.5)
- Stem
- Isaac
- Handlebar
- Isaac
- List price
- 64,990 CZK (isaac-cycle.cz, 2 Nov 2026)
Options when ordering (manufacturer’s default in bold):
| Size | Stem |
|---|---|
| all | 80, 90, 100, 110, 120 mm |
Source: isaac-cycle.cz, checked 2 Nov 2026
Frames with similar geometry
Stack and reach within 12 mm of size XXS (stack 510 / reach 352 mm).
Stack and reach within 12 mm of size XS (stack 525 / reach 362 mm).
Stack and reach within 12 mm of size S (stack 542 / reach 366 mm).
Stack and reach within 12 mm of size M (stack 559 / reach 370 mm).
Stack and reach within 12 mm of size L (stack 578 / reach 375 mm).
Stack and reach within 12 mm of size XL (stack 597 / reach 380 mm).
Spotted a mistake or a missing build? Let me know.