En esta entrada voy a analizar a la nueva Lapierre DH Team 2015, un modelo que este año abandona finalmente el sistema Pendbox y pasa a utilizar un sistema mucho mas convencional: un monopivote con bieletas tipo Pro-link. Este tipo de sistemas es muy habitual en el mundo del Motocross y suelen tener muchisima progresividad. El cuadro está fabricado en aluminio, tiene 210mm de recorrido y otro detalle importante es que incorpora ruedas de 27.5'' como ya empieza a ser habitual este año...
Como podéis ver en la Tabla de excel y en las primeras gráficas el sistema de la nueva Lapierre DH Team tiene una Eficacia de pedaleo mas bien baja, con unos porcentajes de Anti-squat en torno al 40%. En este aspecto Lapierre le ha dado prioridad a la reducción al máximo del Pedal-kickback, que se queda en un nivel muy bajo (11º). El Brake-squat mientras tanto se queda en un nivel alto (90%) .
En la gráfica del Leverage Ratio vemos como el sistema es muy progresivo (3.6-2.2). La gráfica tiene una pendiente prácticamente continua por lo que el funcionamiento va a ser muy bueno tanto con un amortiguador de aire (HV) como con uno de muelle. Los sistemas tipo Pro-link (Clifcat Battle Axe, Bulls Wild Core, Mountain Cycle Shockwave, PDC Solaris, Solid Mission...) suelen tener una gráfica parabólica con una progresividad muy alta en la parte final del recorrido (Funcionan muy bien con amortiguadores de muelle), pero en este caso la gráfica es mucho mas convencional. El sistema en teoría no es demasiado Racing (aunque se estrenó ganando en Fort Williams...) y la geometría tampoco es muy radical, pero va a funcionar muy bien en Bikeparks.
Un saludo.
9 comentarios:
Interesting way to drive a shock on an otherwise uninteresting bike. All manufacturers using a shock tunnel - Specialized, Commencal - should take note.
If I can engage in pure fantasy for a moment, I can see a way of combining two ordinary bikes, this one and the Demo 8, to make one better than ordinary one. Just add the linkage pieces driving the shock on the Lapierre to the sub-seatstay of the Demo 8. Voila, a halfway decent bike, with an improved LR curve and a more stable structure to drive the shock than is available on the Demo.
Taking this fantasy a bit further if you wanted to improve the pedaling performance of the hybridized Demo-like bike, you could raise the main pivot slightly and shorten and reorient that top link a bit (more like the upper link of a Ghost AMR RIOT, Devinci Spartan or Salsa Bucksaw) with the end result that pedaling neutrality at SAG could be achieved without elevating pedal kickback too much. (note: compared to the Demo 8 pedal kickback curve becomes more humped)
I can't imagine that there is a defensible patent covering the Lapierre linkage. And the Horst-link patent has ended, so anyone can build a bike like this without restriction.
Un saludo
Chris
Specialized is already working on a new DH Bike, but it's probably going to be a 2016 model. And I'm really curious about the numbers of the new Demo 650B 2105... If they keep the 26er front triangle it's going to be the worst year ever for the brand.
Best regards,
Tony.
Si, por que vaya año llevan.
Adaptando un cuadro de 29 a unas ruedas de 27.1 por abajo (Stump), y adaptando uno de 26 a esas mismas ruedas, por arriba (Enduro).
Saludos.
Y las 29" tambien muy paradas, a estas alturas toda la gama debería llevar vainas cortas y desviador con Taco. La Enduro de 29 salió en el 2013 y es la única que lo lleva.
In the last few days Specialized has announced the new bike. And it is that horrible thing that was seen at Whistler earlier. No doubt the suspension kinematics will have been improved but I think the same improvements were achievable with the old design, too.
Advocates of the Lawwill link should feel encouraged because the new Demo linkage has more in common with that linkage than the Horst-link that previously had a defining significance for the "FSR" label. The term FSR has been reduced to a bit of marketing fluff.
Even without an exact account of how this new linkage works it is easy to get the basic idea. During the course of travel the IC now projects forwards and down (previously rearwards and down) and there is a lot less movement of the IC than for the previous bike. AS at SAG will probably be higher than for the previous bike and will quickly reduce as the bike moves though its travel. AR will be at a moderate level at SAG and also will reduce as the bike moves deeper into its travel. The changes in AS are welcome and the changes in AR probably don't matter that much.
What has been improved on the new bike could have also been easily fixed with a few pivot position changes on the existing design.
I, for one, will have to convinced that there is anything about this new bike that is a notable improvement on the existing one. My feeling is that it is a step backwards.
Un saludo
Chris
Chris, I checked the new Demo yesterday and guess what... It works almost the same as the old one. It's not like the graphs are one in top of the other, but it's really really close: Low AS, Low PK, mild progression and very low BS. So it's all about weight, looks, etc...
Best regards,
Tony.
The new Demo has already shown up in the Linkage public domain library of bikes. The simulation seems pretty good for something that was developed based on the limited information that was available.
Like Antonio says, the new bike is very much in line with the old one. LR escalation seems a bit higher and pedaling has had a very slight improvement.
Specialized lovers are going crazy over a bike very much like the one it will replace. "Looks great", according to those bright sparks.
Un saludo
Chris
Perdón por la entrada después de tantos años..tengo una duda,voy a montar un Vivid air.¿Que tune sería correcto?.
Yo pondría un tune medio, el cuadro es muy progresivo y no creo que le haga falta nada mas.
Un saludo.
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