DownDuro, PedalPark, Super Enduro – there are many terms for this category, but these bikes have one thing in common: they put a big grin on your face on the descent!
Matthias Reichmann, founder and owner of Reichmann Engineering or RCMN for short, is known for his legendary downhill frame “RIP”. Now the RIP is getting a little brother in the form of a Long Travel Enduro bike. The bike should be in no way inferior to the RIP in terms of downhill qualities, but should be easy to pedal uphill. The key points were put down on paper relatively quickly: plenty of reach, slack head angle, steep seat angle and, of course, kinematics that are second to none.
The frame adopts some of the key points of its big brother, the RIP IV. The kinematics were completely redeveloped on the basis of an experiment a few years ago. The main frame is a completely new development that leaves nothing to be desired and is geared towards the wishes of a modern enduro rider. And by enduro, we don’t mean a leisurely after-work ride, but the hunt for the last second on the descent.
The interplay of three levers ensures perfect rear-end function. Different front shock mounts mean that a 29″ or 27.5″ rear wheel, a 250 mm or 230 mm rear shock can be used without changing the geometry.
Rear end
The SENDuro frame has a rear triangle with seven links. A modified watt linkage* connects the two upper links. This system has the property that the rear triangle rotates around a virtual point. This pivot point changes its position over the course of the suspension travel, allowing individual parameters of the kinematics to be very finely tuned. The main focus here is on creating a perfect progression curve and at the same time a sporty chassis that is pleasant to pedal uphill. The pivot point shifts slowly, which ensures a constant increase in progression in the mid-travel range. At the end of the spring travel, there is a very strong shift in the pivot point, which results in a sharp increase in progression. The modified Watt linkage generates an S-shaped movement, so the system has the advantages of a DW link in the first half of the suspension travel and the advantages of a VPP system in the second half.
*A Watt linkage converts a rotary motion into a linear motion. This technology was originally invented by James Watt, the inventor of the steam engine. The kinematics can be adapted very specifically by modifying the wading linkage.
Geometry
The geometry reflects a modern enduro bike. A long reach combined with a steep seat and slack head angle make the bike very smooth and fast.
| S0 low* | S0 high* | S1 low* | S1 high * | S2 low* | S2 high* | |
| REACH | 450 mm | 459 mm | 470 mm | 479 mm | 500 mm | 510 mm |
| STACK | 649 mm | 649 mm | 649 mm | 649 mm | 649 mm | 649 mm |
| EFFECTIVE SEAT ANGLE | 79,5° | 80,5° | 79,5° | 80,5° | 79,5° | 80,5° |
| SEAT TUBE LENGTH | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm |
| HEAD ANGLE | 62,5° | 63,5° | 62,5° | 63,5° | 62,5° | 63,5° |
| HEAD TUBE LENGTH | 110 mm | 110 mm | 110 mm | 110 mm | 110 mm | 110 mm |
| CHAIN STAY LENGTH | 440 / 450 / 460 mm | 440 / 450 / 460 mm | 440 / 450 / 460 mm | 440 / 450 / 460 mm | 440 / 450 / 460 mm | 440 / 450 / 460 mm |
| WHEELBASE | 1260 mm | 1240 mm | 1280 mm | 1260 mm | 1330 mm | 1310 mm |
| BB DROP | – 32 mm | – 18mm | – 32 mm | – 18mm | -32 mm | – 18mm |
Frame Interfaces
Adjustability
Kinematics
Progression curve
plush – support – infinite
The leverage ratio is divided into three areas: The travel starts with a steep curve that flattens out after the SAG before the progression increases sharply over the last 15 mm of travel. In practice, this is noticeable through very sensitive response in the first third of the spring travel, counter support in the second third and a lot of end progression at the end of the spring travel.
The upper deflection lever can be mounted in three positions, allowing the end progression to be changed. This allows the bike to be optimally adjusted to different dampers and requirements.
Green curve: Upper deflection lever in the front position
Blue curve: Upper deflection lever in the middle position
Red curve: Upper deflection lever in the rear position
Perfect conditions for a steel or air spring shock absorber and an uncompromising riding style.
Anti Squat
The Anti Squat counteracts the mass inertia caused by acceleration and thus the bobbing of the shock absorber during pedaling.
With the SENDuro, the anti-squat in the SAG range is around 125%. The shock is therefore pulled apart slightly when pedaling, giving the bike a sporty, firm character during sprints or pedaling passages and preventing the shock from bobbing due to pedaling movements.
The anti-squat decreases rapidly towards the end of the suspension travel. This promotes a fine response of the damping in the last range of the suspension travel despite the high progression in this range and at the same time counteracts a high pedal kickback during strong compressions.
Availability
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