Good to know: Integrated cockpit
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.
Geometry ?
Koga Kinsei 2026 geometry in sizes XS–XL: stack 525–609 mm, reach 380–420 mm, head angle 72–74°.
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| Stack | 525 mm | 548 mm | 567 mm | 590 mm | 609 mm |
| Reach | 380 mm | 390 mm | 400 mm | 410 mm | 420 mm |
| Head angle | 72° | 73° | 73° | 74° | 74° |
| Seat angle | 74° | 74° | 73.5° | 73.5° | 73.5° |
| Seat tube (c-t) | 480 mm | 510 mm | 530 mm | 550 mm | 580 mm |
| Head tube | 130 mm | 150 mm | 170 mm | 190 mm | 210 mm |
| Top tube (effective) | 531 mm | 547 mm | 568 mm | 585 mm | 600 mm |
| Chainstay | 405 mm | 405 mm | 405 mm | 405 mm | 405 mm |
| Wheelbase | 981 mm | 989 mm | 1005 mm | 1012 mm | 1026 mm |
| Fork offset | 50 mm | 50 mm | 50 mm | 50 mm | 50 mm |
Source: koga.com, checked 1 Nov 2026 · bar position: worked out from published data
Stock build
Kinsei Pro €7,999
- Groupset
- Shimano Dura-Ace Di2 2×12
- Shifters
- Shimano Dura-Ace Di2 R9270
- Cranks
- Shimano Dura-Ace R9200 52-36T with power meter
- Stem
- KOGA with fully integrated cable guidance
- Handlebar
- Controltech Cougar Aero Carbon
- Seatpost
- KOGA full carbon 27.2 mm
- Saddle
- Selle San Marco Shortfit Carbon FX
- List price
- €7,999 (koga.com, 1 Nov 2026)
Kinsei Prime €4,999
- Groupset
- Shimano Ultegra Di2 2×12
- Shifters
- Shimano Ultegra Di2 R8170
- Cranks
- Shimano Ultegra R8100 52-36T
- Stem
- KOGA with fully integrated cable guidance
- Handlebar
- Controltech Cougar Aero
- Seatpost
- KOGA full carbon 27.2 mm
- Saddle
- Selle San Marco Shortfit Carbon FX
- List price
- €4,999 (koga.com, 1 Nov 2026)
Kinsei Premium €4,799
- Groupset
- SRAM Rival AXS 2×12
- Shifters
- SRAM Rival AXS
- Cranks
- SRAM Rival 48-35T
- Stem
- KOGA with fully integrated cable guidance
- Handlebar
- Controltech Cougar Ergo
- Seatpost
- KOGA full carbon 27.2 mm
- Saddle
- Selle San Marco Shortfit Magnesium
- List price
- €4,799 (koga.com, 1 Nov 2026)
Kinsei Prestige €3,799
- Groupset
- Shimano 105 Di2 2×12
- Shifters
- Shimano 105 Di2 R7170
- Cranks
- Shimano 105 R7000 50-34T
- Stem
- KOGA with fully integrated cable guidance
- Handlebar
- Controltech Cougar Ergo
- Seatpost
- KOGA full carbon 27.2 mm
- Saddle
- Selle San Marco Shortfit Magnesium
- List price
- €3,799 (koga.com, 1 Nov 2026)
Source for all builds: koga.com, checked 1 Nov 2026
Frames with similar geometry
Stack and reach within 12 mm of size XS (stack 525 / reach 380 mm).
Stack and reach within 12 mm of size S (stack 548 / reach 390 mm).
Stack and reach within 12 mm of size M (stack 567 / reach 400 mm).
Stack and reach within 12 mm of size L (stack 590 / reach 410 mm).
Stack and reach within 12 mm of size XL (stack 609 / reach 420 mm).
Spotted a mistake or a missing build? Let me know.
Are you the manufacturer, or do you sell this bike? I’m missing 18 values for this model’s stem and bars. Add them