Geometry ?
Maxbike Gravel CRB (Grafen / Topaz) 2025 geometry in sizes S–XL: stack 538–610 mm, reach 375–383 mm, head angle 70.5–72°.
| S | M | L | XL | |
|---|---|---|---|---|
| Stack | 538 mm | 559 mm | 591 mm | 610 mm |
| Reach | 376 mm | 375 mm | 379 mm | 383 mm |
| Head angle | 70.5° | 71° | 72° | 72° |
| Seat angle | 74.5° | 74° | 73° | 72.5° |
| Seat tube (c-t) | 490 mm | 520 mm | 560 mm | 580 mm |
| Head tube | 120 mm | 140 mm | 170 mm | 190 mm |
| Top tube (effective) | 525 mm | 535 mm | 560 mm | 575 mm |
| BB drop | 69 mm | 69 mm | 69 mm | 69 mm |
| Chainstay | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1024 mm | 1026 mm | 1032 mm | 1042 mm |
| Fork length | 395 mm | 395 mm | 395 mm | 395 mm |
| Fork offset | 50 mm | 50 mm | 50 mm | 50 mm |
| Stock build by size | ||||
| Bar width | 440 mm | 440 mm | 440 mm | 440 mm |
| Seatpost setback | 25 mm | 25 mm | 25 mm | 25 mm |
Source: maxbike.cz, checked 1 Nov 2026 · bar position: worked out from published data
Calculated values: stack, reach
S stack 538 mm, S reach 376 mm, M stack 559 mm, M reach 375 mm, L stack 591 mm, L reach 379 mm, XL stack 610 mm, XL reach 383 mm. The manufacturer doesn’t publish stack and reach. I worked them out from the fork length and offset, the angles, the head tube, the top tube and the BB drop. The wheelbase agrees to within about 2 mm. Accurate to about ±5 mm. Corrections
Stock build
Grafen ≈ €2,400
- Groupset
- Shimano GRX 2×12 (GRX610 levers, GRX820 derailleurs, 46/30, 11-36)
- Shifters
- Shimano GRX ST-RX610
- Cranks
- Shimano GRX FC-RX610 46/30
- Stem
- Ritchey
- Handlebar
- Ritchey Comp Gravel Baquiano 440 mm
- Seatpost
- Ritchey Comp AL6061 27.2/400/25 mm offset
- Saddle
- Selle Italia X3
- List price
- 59,990 CZK (maxbike.cz, 1 Nov 2026)
Topaz ≈ €2,400
- Groupset
- Shimano GRX 1×12 (GRX610 levers, GRX822 RD, 40T, 10-51)
- Shifters
- Shimano GRX ST-RX610
- Cranks
- Shimano GRX FC-RX610 40T
- Handlebar
- Ritchey Comp Gravel Baquiano 440 mm
- Seatpost
- Ritchey Comp AL6061 27.2/400/25 mm offset
- Saddle
- Selle Italia X3
- List price
- 59,990 CZK (maxbike.cz, 1 Nov 2026)
Source for all builds: maxbike.cz, checked 1 Nov 2026
Frames with similar geometry
Stack and reach within 12 mm of size S (stack 538 / reach 376 mm).
Stack and reach within 12 mm of size M (stack 559 / reach 375 mm).
Stack and reach within 12 mm of size L (stack 591 / reach 379 mm).
Stack and reach within 12 mm of size XL (stack 610 / reach 383 mm).
Spotted a mistake or a missing build? Let me know.
Are you the manufacturer, or do you sell this bike? I’m missing 5 values for this model’s stem and bars. Add them