Schmolke TLO 50 vs Bontrager Aeolus RSL 51: Save Up to 470g
The Bontrager Aeolus RSL 51 is Trek’s flagship 51mm all-round wheelset and a common upgrade for premium Madone builds. It carries the RSL name, uses Trek’s OCLV carbon and costs approximately $4,000.
That sounds like a serious performance wheelset—until you put it beside the Schmolke TLO 50.
The TLO 50 delivers essentially the same rim depth with a wider 25mm internal platform, carbon spokes and a complete wheelset weight starting from approximately 940g. Even with dependable DT Swiss 180 hubs, the TLO 50 weighs approximately 1,025g.
The numbers are difficult to ignore.
The TLO 50 saves approximately 385g with DT Swiss 180 hubs—or approximately 470g with Extralite or NONPLUS hubs.
Schmolke TLO 50 specifications
| Feature | Schmolke TLO 50 |
|---|---|
| Rim depth | 50mm |
| Wheelset weight | Approx. 940g with Extralite or NONPLUS hubs Approx. 1,025g with DT Swiss 180 hubs |
| Internal width | 25mm |
| External width | 32.5mm |
| Rim format | Hooked and tubeless-ready |
| Spokes | 24 carbon spokes per wheel |
| Hub choices | Extralite, NONPLUS or DT Swiss 180 |
| Maximum system weight | 115kg |
| Manufacture | Rims made in Germany |
| Price | DT Swiss 180: $5,375 Extralite: $5,995 NONPLUS: $6,245 |
Bontrager Aeolus RSL 51 specifications
| Feature | Bontrager Aeolus RSL 51 |
|---|---|
| Rim depth | 51mm |
| Wheelset weight | Approx. 1,410g claimed |
| Internal width | 23mm |
| External width | 31mm |
| Rim format | Hooked and tubeless-ready |
| Spokes | 24 DT Swiss Aerolite steel spokes per wheel |
| Hub configuration | Bontrager RSL hubs with DT Swiss internals |
| Maximum rider weight | No separate wheel-specific limit stated; bicycle limit applies |
| Manufacture | Not stated by Trek |
| Price | Approximately $4,000 per wheelset |
The Schmolke advantage
- ⚖️ Approximately 385g lighter with DT Swiss 180 hubs
- 🚀 Approximately 470g lighter with Extralite or NONPLUS hubs
- 📏 Wider 25mm internal and 32.5mm external rim platform
- 🧵 Carbon spokes instead of conventional steel spokes
- 🔧 Choice of three premium hub configurations
- 🇩🇪 German-made carbon rims
The Bontrager costs less. The Schmolke gives you considerably more wheelset.
Up to 470g is not a marginal difference
Bontrager claims approximately 1,410g for the Aeolus RSL 51. The TLO 50 weighs approximately 1,025g with DT Swiss 180 hubs, immediately removing around 385g.
Choose Extralite or NONPLUS hubs and the Schmolke drops to approximately 940g—a saving of approximately 470g.
This is not chasing a handful of grams in a bottle cage or computer mount. It is removing close to half a kilogram from the wheels while retaining a full 50mm aerodynamic rim.
You feel that reduction every time the bike accelerates, responds to a surge, changes pace or climbs. The TLO 50 gives a premium bike the immediate, lively response that a 1,410g wheelset cannot reproduce.
Bontrager Aeolus RSL 51: approximately 1,410g
Schmolke TLO 50: from approximately 940g
The Schmolke removes approximately one-third of the Bontrager wheelset’s claimed weight.
A wider platform for modern road tyres
The Aeolus RSL 51 uses a 23mm internal rim width. The TLO 50 takes the modern wide-rim approach further with a 25mm internal and 32.5mm external profile.
Schmolke developed the TLO 50 around modern road tyres rather than carrying forward a narrower rim platform. A nominal 28mm Continental GP5000 measures approximately 32.5mm on the TLO 50, creating a clean tyre-to-rim transition while providing greater tyre volume.
The result is a wheel and tyre system designed to support speed, grip and comfort—not merely a lightweight rim with a deep profile.
Carbon spokes complete the performance package
The Aeolus RSL 51 uses 24 DT Swiss Aerolite steel spokes in each wheel. They are proven conventional spokes, but they do not provide the same weight or material advantages as Schmolke’s carbon spokes.
The TLO 50 uses 24 carbon spokes per wheel with titanium end fittings. Their high tensile strength allows greater spoke tension while contributing to the wheelset’s stiffness, exceptionally low weight and responsive power transfer.
Carbon also has different damping properties from steel. Schmolke uses those properties to combine lateral stiffness with a smoother ride over imperfect road surfaces.
That is how the TLO 50 can weigh as little as 940g without becoming a shallow, climbing-only wheelset. It remains a genuine 50mm all-rounder for racing, fast road riding, technical descents and serious climbing.
Take up to 470g out of your wheelset
Choose your TLO 50 with Extralite, NONPLUS or DT Swiss 180 hubs.
Configure Your Schmolke TLO 50What does the Bontrager Aeolus RSL 51 offer?
The Bontrager is designed as a versatile aerodynamic upgrade for Trek riders. It gives you:
- 🔷 Trek RSL OCLV carbon rims
- 💨 A 51mm aerodynamic profile
- 🔧 Serviceable DT Swiss hub internals
- 🛡️ A lifetime warranty for the original owner
- 🚲 Straightforward integration with premium Trek road bikes
Its warranty is strong, and its association with Trek makes it an obvious factory-style upgrade for a Madone. But obvious does not mean lighter, wider or more advanced.
The Bontrager remains a conventional 1,400g-class carbon wheelset. The TLO 50 operates in an entirely different weight category.
Is investing another $1,375 worth saving approximately 385g?
The Aeolus RSL 51 costs approximately $4,000. The TLO 50 with DT Swiss 180 ceramic hubs costs $5,375.
Investing another $1,375 moves you from an approximately 1,410g wheelset to an approximately 1,025g wheelset. You save around 385g while gaining a wider rim platform, carbon spokes and German-made rims.
For a rider already investing in a premium Trek, that is a compelling upgrade. The wheels have a major influence on acceleration, climbing and the responsiveness of the entire bike. This is exactly where removing nearly 400g delivers genuine value.
The 940g TLO 50 with Extralite hubs costs $5,995—$1,995 more than the Bontrager. That increases the weight saving to approximately 470g.
You are not investing nearly $2,000 for different decals. You are buying a dramatically lighter wheelset with premium lightweight hubs, carbon spokes and one of the lightest commercially available 50mm wheel systems in the world.
The verdict: which wheelset wins?
The Bontrager Aeolus RSL 51 is the predictable wheel choice for a high-end Trek. It matches the brand, carries the RSL badge and costs less than the Schmolke.
The Schmolke TLO 50 is the performance choice.
It is wider, uses carbon spokes, gives you a choice of premium hubs and saves approximately 385g even when built with DT Swiss 180 hubs. Move to Extralite or NONPLUS hubs and the weight saving climbs to approximately 470g.
If you are upgrading a premium bike to make it faster, lighter and more responsive, settling for a 1,410g wheelset because it carries the same badge as the frame leaves too much performance on the table.
The data does not lie. The Schmolke TLO 50 wins.
Build the Trek that the factory did not
Upgrade to a 50mm wheelset weighing from approximately 940g.
Shop the Schmolke TLO 50Frequently asked questions
How much lighter is the Schmolke TLO 50?
The approximately 1,025g TLO 50 with DT Swiss 180 hubs is around 385g lighter than Bontrager’s claimed 1,410g wheelset weight. The approximately 940g Extralite or NONPLUS builds save around 470g.
Which wheelset has the wider rim?
The Schmolke TLO 50 has a 25mm internal and 32.5mm external width. The Bontrager Aeolus RSL 51 has a 23mm internal and 31mm external width.
Are both wheelsets tubeless-ready?
Yes. Both use hooked carbon rims and support tubeless road tyres.
Which TLO 50 hub should I choose?
Choose DT Swiss 180 hubs if proven serviceability and reliability are your priorities. Choose Extralite for the lowest 940g build at a lower price than NONPLUS. NONPLUS provides another extremely light, robust and low-maintenance premium option.
Is the TLO 50 suitable for a Trek Madone?
Yes. The 50mm depth complements an aerodynamic bike such as the Madone while removing approximately 385g to 470g compared with the Aeolus RSL 51. Shimano HG and SRAM XDR freehub options are available.
Data sources: Manufacturer specifications and pricing published by Schmolke Carbon, Bspoke Velo and Trek. Prices and specifications checked August 2026 and may change.