The Trek Aeolus RSL AirLoom is the highest-specification saddle in Trek's AirLoom range - the Race Shop Limited version that uses a full OCLV Carbon shell and full OCLV Carbon rails to achieve the lowest possible weight while delivering the AirLoom 3D-printed lattice comfort that defines the entire range. Where the Pro AirLoom uses a carbon composite shell and carbon composite rails, the RSL upgrades both to full OCLV Carbon construction - the same material Trek uses in its highest-performance frames applied here to both the saddle base and the rail system. The result is a 155mm saddle weighing just 167g - a genuinely race-weight specification that competes with the lightest performance saddles available at any price.
The RSL designation confirms this is a Race Shop Limited product - developed at the highest level of Trek's saddle engineering for road, gravel, and cross-country MTB racing. It is designed for riders who want the best available specification and are willing to pay the premium that the full carbon construction commands over the Pro and Elite tiers.
The 155mm width is designed to support riders whose sit bone measurement corresponds to a wider saddle width. Saddle width should be matched to sit bone measurement for correct support - contact Trek Bikes Florida for saddle fit assistance if you are unsure of your correct width.
The AirLoom lattice is the comfort technology shared across the RSL, Pro, and Elite AirLoom models - a 3D-printed Elastomeric Polyurethane lattice structure that replaces traditional foam padding with a variable-density printed matrix. The lattice is tuned to provide firm support under the sit bones where structural support is needed and softer compliance under soft tissue where pressure causes discomfort. Unlike foam, which applies a uniform material property across the saddle surface, the 3D-printed lattice can be engineered with different densities in different zones - delivering targeted support that foam construction cannot replicate with the same precision.
The full cutout runs the complete length of the saddle centreline, eliminating all soft tissue pressure at the most sensitive contact zone. Combined with the AirLoom lattice's zonal compliance, the full cutout allows a more powerful, forward-rotated position by removing the primary source of discomfort that prevents riders from sustaining an aggressive position over long efforts.
The short 250mm profile suits riders of any gender in an aerodynamic race riding position - a short-nose design that improves thigh clearance, reduces weight, and improves saddle fit in the rotated pelvis position that performance road, gravel, and triathlon riding requires.
The 7x10mm oversized carbon rails are a proprietary specification - wider than the standard 7x9mm carbon rail used on most performance saddles. Trek states the oversized dimension is both lighter and stronger than a standard rail at equivalent carbon construction quality. The tradeoff is seatpost compatibility - the 7x10mm oversized rails are not compatible with standard 7x9mm oval carbon rail clamps or side-clamping seatposts designed for standard rail dimensions. Confirm your seatpost clamp accepts 7x10mm oval rails before purchase. Trek's own seatposts are compatible, as are most round rail clamps that clamp from the top and bottom rather than the sides.
A Blendr accessory mount is integrated under the shell and included with the saddle - allowing a compatible rear light or radar unit to be mounted cleanly under the saddle without a separate bracket. This integrated mount maintains the saddle's aerodynamic profile and clean visual appearance while providing a functional rear visibility solution.
The RSL AirLoom uses a full OCLV Carbon shell and full OCLV Carbon rails - both upgraded from the carbon composite construction on the Pro AirLoom. This produces a lower weight at 167g for the 155mm versus 170g for the Pro, and places the RSL at the top tier of the AirLoom range. Both saddles share the AirLoom 3D-printed lattice technology and full cutout design.
The RSL AirLoom uses 7x10mm oversized OCLV Carbon rails - wider than the standard 7x9mm carbon rail. This proprietary size is not compatible with side-clamping seatposts designed for 7x9mm oval rails. Trek's own seatposts and most top-and-bottom clamping seatposts are compatible. Confirm your seatpost clamp accepts 7x10mm oval rails before purchase.
The 155mm version weighs 167g. The 145mm weighs 164g and the 135mm weighs 162g. The included Blendr mount adds approximately 12g when fitted.
Yes. A Blendr accessory mount is included and integrated under the shell, allowing a compatible rear light or radar unit to be cleanly mounted under the saddle without a separate bracket.
The full cutout removes all material from the saddle's centreline for its entire length, eliminating soft tissue pressure at the most sensitive contact zone and allowing a more powerful, forward-rotated riding position without the discomfort that a solid or partial cutout saddle creates in an aggressive position.
| Size | 155 |
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