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The Ratchet LN system distributes the combined forces from the rider and the motor over a larger area than the previous pawl freehub systems, increasing the systems’ durability thanks to lower load peaks. The 370 hub enables full power transmission to the ground with reinforced hybrid spokes laced to a resistant aluminum rim, available in two inner widths.
Product features - DT Swiss H 1900 Spline® 35
- Use: E-MTB / All Mountain
- Model: H 1900 Spline®
- Wheel size: 29"
- Rim diameter: 622 mm
- Rim type: Clincher
- Tubeless ready: ✔
- Inner width: 35 mm
- Outer width: 40 mm
- Rim height: 20 mm
- Axle system: Boost 12 x 148 mm (Thru Axle)
- Hub Type: 370 Straightpull hub
- Freehub Body: Ratchet LN System 18
- Rim: Aluminum, hooked
- Spokes: DT hybrid 1
- Nipples: DT Pro Lock® Squorx aluminum
- Holes/Spokes: 28
- Lacing: 3-cross (1:1)
- Valve hole: Presta / SV Ø 6.5 mm
- Disc Mount: Disc IS 6-bolt
- Recommended system weight max: 150 kg (body weight + bike + equipment)
- ASTM Classification: 4
Freehub (choose variant)
- Shimano Micro Spline
- Sram XD
- Rim: Aluminum
- Hub: Aluminum
- Spoke: Stainless steel
- Nipple: Aluminum
- Freehub body: Steel
Weight (manufacturer information)
- Shimano Micro Spline - 1234 g
- Shimano - 1252 g
- Sram XD - 1221 g
Scope of delivery
- DT Swiss H 1900 Spline 29" 35 mm 6-bolt Boost Rear Wheel
- Tubeless tape 37 mm
- Tubeless valve MTB 32 mm
REDESIGNED HUB SHELL
Due to the battery and motor, eMTBs tend to weigh more than traditional MTBs of the same category. eMTBs are not ridden less hard; in fact the opposite is often the case, as tours are longer and the load on the components increases. In addition, the transmitted torque of the motor is higher than with conventional MTBs. The hub shell was completely redesigned for the new hybrid generation with these points in mind.
Grooved ball bearings are usually found in high-end bicycle hubs. These bearings have been optimized to spin fast and absorb radial forces while still being able to take up a certain number of axial forces. Bearing wear occurs when the forces on the balls or on the running surface are too high. The high local loads can lead to indentations in the running surface, which causes the balls to no longer run smoothly. Excessive point loads can also lead to abrasion of the running surface, which can result in play. Given the greater loads on eMTBs, adjustments to the ball bearings are also required. Accordingly, the new generation of hybrid wheels use larger ball bearings than the 240 EXP MTB hub. The larger ball bearings distribute loads over a larger area of the running surface, whereby less wear occurs.
SPECIFIC HARDENED STEEL FREEHUB BODY
The torque of the motor and the crank is transmitted via the chain to the cassette and then to the freehub body. This interface of cassette and freehub body is optimized for the specific loads accrued by eMTBs. Hybrid freehub bodies are made from specific hardened steel. Compared to the conventional aluminum freehub body, the specific hardened steel offers a higher strength. In addition, it has a higher fatigue strength. This means that despite a high number of load changes resulting in minor damage to the surface, the strength remains. The higher strength reduces wear on the surface of the freehub body. As a result, the removal of the freehub body is easier, since it is less likely that the cassette will dig into the freehub body.
Modern eMTBs are developed to go faster and harder. The Hybrid wheels are proven to support a maximum system weight of 150 kg. DT Swiss rims have additional material right where it matters. They have reinforcement on the external central part of the rim, because this is where the biggest loads are when the bike supports its and the rider’s weight. The forces exerted on the wheels come from the top and go down vertically to the ground. That is to say that the spokes which are on the lower part at the time of the rotation, support most of the weight. Therefore, the profiles of the rims have not changed and remain the same as the ones that have been tested and approved on the most challenging trails. These rims are available in a variety of internal widths so that every rider can select the features they want and get the best grip and traction possible.
Thicker spokes are used in the Hybrid wheels in comparison to the conventional MTB wheels. This Hybrid specific spoke increases both the lateral and the torsional stiffness. As previously explained in the context of the hub flange, this helps to get better lateral stiffness, more suited to the loads of eMTBs but it also increases torsional stiffness, for the transmission of the propulsion power from the hub to the rim. Furthermore, each spoke is always loaded during a rotation. This continuous and consistent load avoids fatigue of the spoke that can lead to failure.
The term Straightpull refers to spokes with no bend at the head. This design allows for an ideal strength to weight ratio when compared to conventional spokes. Due to their more precise alignment and direct trajectory, straight-pull spoke technology creates a stiffer, more responsive wheel.
DT Swiss Support for Conversion
The support site offers an overview and can help you to find the right conversion kit to convert your hub to fit a new axle measurement or for a new group set.