2026 Trek Domane RSL Gen 4 vs 2025 Orbea Orca Aero M20iLTD
We can't match sizes for these two: one of them has no stack and reach for the sizes shown.
What changes on the Orbea Orca Aero M20iLTD
- Frame stack
- n/a
- One of the bikes has no number for this
- Frame reach
- −10 mm
- Shorter frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- −12 mm
- Shorter: livelier
The two frames
We can't draw these frames yet. The Trek Domane RSL Gen 4 numbers we have for size 56 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Domane RSL Gen 4 56 | Orbea Orca Aero M20iLTD 53 | Difference |
|---|---|---|---|
| Reach | 395 | 385 | −10 mm |
| Stack | 548 | not listed | |
| Head tube angle | 72.8° | 72.8 | ±0.0° |
| Effective top tube | 560 | not listed | |
| Chainstay length | 420 | 408 | −12 mm |
| Wheelbase | 1010 | not listed | |
| BB drop | 78 | not listed | |
| Standover | 764 | 776 | +12 mm |
| Seat tube length | 525 | 524 | −1 mm |
| Head tube length | 129 | 122 | −7 mm |
| Seat tube angle | not listed | 73.5 | |
| Fork length | not listed | 368 |
Differences are the Orbea Orca Aero M20iLTD minus the Trek Domane RSL Gen 4. Full charts: 2026 Trek Domane RSL Gen 4, 2025 Orbea Orca Aero M20iLTD.
Where each sits in its class
Trek Domane RSL Gen 4Orbea Orca Aero M20iLTD
AggressivePositionUpright
CalmSteeringQuick
PlayfulBalancePlanted
Each bike is ranked against the other road 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 | Trek Domane RSL Gen 4RSL Gen 4 | Orbea Orca Aero M20iLTDM20iLTD |
|---|---|---|
| Fork | Trek Domane SLR | not listed |
| Frame | not listed | Orbea Orca Aero |
| Shifter | not listed | Shimano ST-8170 Ultegra Di2 |
| Derailleur | not listed | Shimano Ultegra |
| Cassette | not listed | Shimano Ultegra |
| Crankset | not listed | Shimano Ultegra Mid Compact |
| Wheelset | not listed | OQUO Road Performance RP45TEAM |
| Tire | not listed | Vittoria Corsa N.Ext G2.0 |
| Brake | not listed | Shimano Ultegra R8170 Di2 |
| Rotor | not listed | Shimano Ultegra R8170 |
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