BC40 Shimano XT M8100
Allied
Trail
BC40 Shimano XT M8100 is a carbon trail mountain bike (2024), by Allied, from the BC40 lineup. This bike is aimed at riders who want a more active, performance-leaning off-road feel, with a sporty, active riding position, while being well suited to natural trails and mixed off-road terrain. Its profile is strongest in areas like strong climbing friendliness for sustained uphill riding, a balanced ride feel between comfort and directness, and balanced, versatile speed for everyday riding. That said, compared with more specialized alternatives, the compromise is a value score that depends more on priorities than pure price efficiency. Add this bike to compare on MatchBikes.com and see how it stacks up against similar trail models.
Rating

Score Summary
Performance
Built for speed and efficiency
Fit
Dialed-in Fit & Comfort
Value
Specifications
General
Frame
Drivetrain
Wheels
Brakes
Cockpit
Seat
Geometry
| Measurement | SM | MD | LG | XL |
|---|---|---|---|---|
| Stack Reach Ratio | 1.424 mm | 1.369 mm | 1.309 mm | 1.263 mm |
| Bottom Bracket Height | 334 mm | 334 mm | 334 mm | 334 mm |
| Front Center | 710 mm | 739 mm | 775 mm | 806 mm |
| Rake | 44 mm | 44 mm | 44 mm | 44 mm |
| Trail | 114 mm | 115 mm | 114 mm | 114 mm |
| Stack | 598 mm | 609 mm | 622 mm | 633 mm |
| Reach | 420 mm | 445 mm | 475 mm | 501 mm |
| Top Tube Length | 569 mm | 596 mm | 630 mm | 659 mm |
| Seat Tube Angle | 76 ° | 76 ° | 76 ° | 76 ° |
| Seat Tube Length | 395 mm | 420 mm | 450 mm | 500 mm |
| Head Tube Angle | 66.5 ° | 66.5 ° | 66.5 ° | 66.5 ° |
| Head Tube Length | 95 mm | 105 mm | 120 mm | 135 mm |
| Chainstay Length | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1145 mm | 1174 mm | 1210 mm | 1241 mm |
| Bottom Bracket Drop | 40 mm | 40 mm | 40 mm | 40 mm |
| Wheels | 29" | 29" | 29" | 29" |
| Rider Min Height | 158 cm | 168 cm | 178 cm | 186 cm |
| Rider Max Height | 171 cm | 180 cm | 189 cm | 199 cm |




























































