| Frame Size | 16S | 18M | 20L | 22XL |
| Estimated Rider Height | 162cm - 171cm | 171cm - 180cm | 180cm - 188cm | 188cm - 197cm |
| Specified Rider Height | ||||
| Class | ||||
| Style | relaxed | relaxed | relaxed | relaxed |
| Material | steel | steel | steel | steel |
| Fork | rigid | rigid | rigid | rigid |
| Handlebar | drop bar | drop bar | drop bar | drop bar |
| Suspension Correction | 100 mm | 100 mm | 100 mm | 100 mm |
| Top Tube Effective Length | 575 | 595 | 620 | 645 |
| Effective Top Tube Length (Est) | 574.8269 | 594.9671 | 620.3301 | 644.6103 |
| Reach | 392 | 410 | 432 | 452 |
| Stack | 598 | 605 | 616 | 630 |
| Standover | 782 | 810 | 840 | 871 |
| Head Tube Angle | 69.5 | 70.0 | 70.5 | 70.5 |
| Seat Tube Angle | 73 | 73 | 73 | 73 |
| Chainstay Length | 445 | 445 | 445 | 445 |
| Front Center | 642 | 657 | 677 | 703 |
| Bottom Bracket Drop | 60 | 60 | 60 | 60 |
| Trail | 88 | 85 | 82 | 82 |
| Trail 45 | 84 | 81 | 77 | 77 |
| UDH | YES | YES | YES | YES |
| Tire Width Max 700c | 66 | 66 | 66 | 66 |
| Tire Width Max 650b | 3 | 3 | 3 | 3 |
| Axle Spacing | ||||
| Stealth Dropper | YES | YES | YES | YES |
| Seatpost Diameter | 30.9 | 30.9 | 30.9 | 30.9 |
| Max Chainring 1x | 38 | 38 | 38 | 38 |
| Dropout | fixed | fixed | fixed | fixed |
| Internal Storage | ||||
| Frame Weight | 2600 | |||
| Base Build USD | ||||
| Frameset USD | $1037 | $1037 | $1037 | $1037 |
| Location | Kent, United Kingdom | Kent, United Kingdom | Kent, United Kingdom | Kent, United Kingdom |
Brother Big Bro 2025
Brand: Brother
Model: Big Bro
Year: 2025
Category: NA
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