2027 Specialized Epic Ultralight LTD vs 2026 BMC Fourstroke R 01 ONE
The XL is the BMC Fourstroke R 01 ONE size closest to your XL (Low) Specialized Epic Ultralight LTD. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the BMC Fourstroke R 01 ONE
Compared with the Specialized Epic Ultralight LTD in XL (Low), the BMC Fourstroke R 01 ONE in XL places the top of the head tube 24 mm lower and 12 mm further back, relative to the bottom bracket. Its wheelbase is 39 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −24 mm
- Lower front end
- Frame reach
- −12 mm
- Shorter frame reach
- Wheelbase
- −39 mm
- Shorter: quicker to change direction
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- −11 mm
- Shorter: livelier
The two frames
Specialized Epic Ultralight LTD, XL (Low)BMC Fourstroke R 01 ONE, XLDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Epic Ultralight LTD XL (Low) | BMC Fourstroke R 01 ONE XL | Difference |
|---|---|---|---|
| Reach | 512mm | 500 | −12 mm |
| Stack | 639mm | 615 | −24 mm |
| Head tube angle | 66.5° | 66.5 | ±0.0° |
| Seat tube angle | 76.5° | 75.6 | −0.9° |
| Effective top tube | 664mm | 651 | −13 mm |
| Chainstay length | 442mm | 431 | −11 mm |
| Wheelbase | 1258mm | 1219 | −39 mm |
| BB drop | 45mm | 38 | −7 mm |
| BB height | 330mm | not listed | |
| Standover | 756mm | not listed | |
| Seat tube length | 505mm | 490 | −15 mm |
| Fork length | 516mm | not listed | |
| Head tube length | 150mm | 118 | −32 mm |
Differences are the BMC Fourstroke R 01 ONE minus the Specialized Epic Ultralight LTD. Full charts: 2027 Specialized Epic Ultralight LTD, 2026 BMC Fourstroke R 01 ONE.
Where each sits in its class
Specialized Epic Ultralight LTDBMC Fourstroke R 01 ONE
Each bike is ranked against the other XC bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Specialized Epic Ultralight LTDS-Works 9 Ultralight LTD | BMC Fourstroke R 01 ONEONE |
|---|---|---|
| Fork | RockShox Sid SL Ultimate | Öhlins RXC34 |
| Rear shock | RockShox SIDLuxe Ultimate | Öhlins TXC2 |
| Shifter | SRAM Pod Controller Ultimate | SRAM Pod Controller |
| Derailleur | SRAM XX SL Eagle AXS | SRAM XX Eagle Transmission |
| Cassette | SRAM CS-1299 | SRAM Eagle |
| Chain | SRAM XX SL Eagle Transmission | SRAM XX SL Eagle Transmission |
| Crankset | SRAM SL Eagle | SRAM Eagle 70 Transmission |
| Bottom bracket | CeramicSpeed Alpha | Praxis PF92 |
| Wheelset | Roval Control World | DT Swiss XRC 1200 SPLINE |
| Tire | Specialized Air Trak | Vittoria Mezcal |
| Brake | Trickstuff Piccola | SRAM Motive Ultimate |
| Handlebar | Roval Control SL | BMC ICS one-piece |
| Grips | Supacaz Supalite | not listed |
| Dropper post | BikeYoke Divine SL | BMC Autodrop |
| Seatpost | Specialized Bike Yoke Divine SL | not listed |
| Saddle | Specialized S-Works Power | Prologo Dimension NDR |
| Frame | not listed | BMC Fourstroke R 01 |
| Chainring | not listed | 34 |
| Rotor | not listed | SRAM HS2 |
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