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Cambio Sram XX 2x10

- MTB
Cambio Sram XX 2x10

 

Sram a vuelto a desmarcarse, como la marca de componentes mas innovadora presentando un grupo inedito: El Sram XX. ¿Dos platos y diez coronas !. Todo fruto de la experiencia en competicion, en el cual su expector no solo se ciñe a este Gueto, si no que se extendera a otras disciplinas...

Era natural que Sram, despues de su experiencia en los grupos de carretera, unificara sus cuatro marcas de montaña, para crear uno especifico para Mountain Bike.

 

Este llegara en el 2010, y se llamara Sram XX y promete dar un tiron de orejas a Shimano. Y su doble X, hara referencia a su denominacion comun X de marca, y a la traducion del latin X, como diez.

Quizas muchos se echen las manos a la cabeza, pensando que solo sera un grupo para los bikers mas en forma, solo para los corredores capaces de mover grandes desarollos...  Pero, ¡¡No sera asi!!

El casete contora con un piñon grande de 36 dientes, que unido a los diferentes desarrollos de plato (mas pequeño de lo habitual) logra desarrollos semajantes a los existentes en las actuales transmisiones 3x9 (tres platos y nuevo piñones). Evitando ademas, la duplicacion de desarrollo que existia hasta ahora.

 

Otra de las innovaciones del grupo es permitir la libertad absoluta en la eleccion de desarrollos. si hasta ahora no se recomendaba curzar la cadena, para asi no someter a inadecuadas torsiones; con el Sram XX, eso pertenecera al pasado y el plato grande se podra engranar con cualquiera de las coronas, sin importar que la cadena vaya completamente cruzada. Esto permitir rodar en el denominado BIG BIG. Plato y piñon grande Y de ahi, jugar con las piñones. Esto permitira evitar cambiar de plato constantemente y ahorrar en esfuerzo, tiempo y riesgos mecanicos.

 

Todo esto lo han conseguido reduciendo la linea de la cadena (la distancia del centro de pedalier al plato mediano) y de paso han disminuido la separacion entre los pedales (factor Q), asemejandola a una bici de carretera, que pasa a ser de 156mm.

 

 

Casete: 208 gramos (11-36)
Cambio: 181 gramos
Mandos de cambio: 183 gramos
Desviador: 118 gramos (abrazadera baja)
Pedalier: 684 gramos (BB30)
Frenos: 292 gramos (Post Mount, disco 160 mm)
Horquilla: 1.436 gramos (SID XX World Cup) / 1.546 gramos (SID XX) / 1.651 gramos (Reba XX) / 1.695 gramos (Revelation XX)

 

 

Por fin tenemos un poco de competencia a los gigantes de Shimano.

 

Ahora a esperar a las probaturas del vecino de turno, para conocer la evolucion y realidad de esta gran novedad.

 

5 comentarios

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Rottmoosy -

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uribetxg -

Estoy siguiendo con especial interes las evoluciones de este grupo de 10 coronas de montaña... porqué ya hace tiempo que me ronda en la cabeza una idea: utilizar coronas 11x32 + cambio procedentes de montaña en convinación con manetas de carretera (Shimano dura-ace, sram red). Hasta ahora imposible, dado que no habia 10v en montaña, pero, ¿funcionará la convinación con los nuevo XX?

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Hola Jon, me encanta tu blog, que sigo con regularidad. ¿No tienes ninguna dirección de correo electrónico de contacto?
Saludos,
Vanesa