Borikï¿½n Mountainbike

astacio75 · Bicicletero Cronico Joined: 13 Sep 2008 Posts: 989

Aqui un temita para que den su opiniï¿½n si quieren.Me llamo la atenciï¿½n que se ganï¿½ el US National Cup, una carrera XC en una de estas.Personalmente no me llaman la atenciï¿½n pero tengo 3 panas con los cuales suelo rodar frecuentemente que tienen de estas y las adoran,incluso uno tiene 2 de ellas.
Aqui ventajas y desventajas:
http://www.puromtb.com/Default.aspx?tabid=426&type=art&site=2002&parentid=71

Trecko · Posted: Sun Jul 19, 2009 5:05 pm Post subject:

NO VUELVO A 26!!!

Trata esa Luis..

NO te arrepentiras!!
_________________
Disfruta la vida, es mï¿½s tarde de lo que crees...
Si te caes siete veces, levï¿½ntate ocho... y sigue pedaleando!!!...

Danny Valle · Posted: Sun Jul 19, 2009 6:24 pm Post subject:

Wheel Size and the Science of Hauling Ass

The basic concept of the larger diameter is simple: it will keep your wheels on top of oncoming obstacles. Rather than riding IN the terrain, youï¿½ll be riding ABOVE it, gaining more control and stability on even the roughest trails. Think of the difference between a skateboard wheel and monster truck tire. The skateboard wheel can come to a grinding halt on a pebble while the monster truck wheel can crush grannyï¿½s Oldsmobile. Yes, this example is a little extreme, but you get the idea.

The larger wheel offers increased centrifugal force, which in turn improves the bikeï¿½s stability. The extra three inches also increases the amount of tire contacting the ground at any one moment, meaning enhanced tire bite.
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Veintinuevepulgadas!!!

"One lick from the lollipop of mediocrity and you suck forever"

Danny Valle · Posted: Sun Jul 19, 2009 6:48 pm Post subject:

Why Ride A 29″er?
February 24th, 2008 by Guitar Ted
Why ride a 29″er?

This might seem like an odd question for this site and especially in 2008 when it would seem that a 29″er is an ï¿½obviousï¿½ option for any mountain biker these days. I would submit to you that if you are already on board with the 29″er as a bike for off road, this might seem as if it is the case, but there are a lot of folks still looking at 29″ers for the first time. To those who are new to the idea of a 29″er, I paraphrase a popular adult beverage tag line: This post is for you.

The most commonly heard attribute of 29″ers is their ability to roll over trail obstacles with less drama than smaller wheels do. While this is certainly true, it is far from the only thing going on with 29 inch wheels. Here I will briefly lay out the advantages for those who are curious.

Better Roll Over: Okay, lets get this out of the way right off the bat. 29″ers have a different ï¿½angle of attackï¿½ in relation to trail obstacles you might encounter. This realizes itself to riders as a smoother feel. Sometimes it negates the need for front suspension for some trail riders, thus the plethora of rigid front forks on big wheelers. It is also interesting to note that what is good for the front wheel is also good for the rear wheel.

Better Traction: 29″ers, by the nature of the diameter of the wheel, have a differently shaped contact patch than 26″ers do. (Some would argue that it is a bigger contact patch) However it really is, it is obvious that a 29″er has an ability to claw itï¿½s way up steeps and technical climbs that smaller diameter wheels can not match. This is aided by the following attributeï¿½ï¿½ï¿½ï¿½

Better Momentum Conservation: One of the oft overlooked characteristics of 29 inch wheels is their propensity for carrying momentum better than smaller wheel sizes do. This helps in clearing climbs, but it also causes 29″ers to be a bit tougher to get going from a slow speed, or stopped situation. If a 29″er rider can learn to work with the momentum factor of 29″ers, it can become one of your greater allies. Less braking is necessary due to the stability and better traction of 29 inch wheels. So if you can learn to trust that, the momentum saved can be a big benefit. Smaller wheels tend to not have any of these traits in the amount that 29″ers do, so using momentum with smaller wheel sizes doesnï¿½t work nearly as well.

Gyroscopic Effect While this is very closely related to the above mentioned benefit, I broke it out because this is the one thing that makes 29″ers seem so ï¿½safeï¿½ when downhilling, or while attacking technical terrain. A 29 inch wheel by its very nature will want to stay upright better than a smaller wheel will. This can work for you not only in high speed down hills, but in slower technical terrain as well. It is one of the reasons why many taller riders feel that the 29″er bike is less likely to ï¿½endoï¿½ than smaller wheeled bikes.

Loose Terrain Traversing/Traction There is a reason why early 29″er pioneers were winning mud bog contests and crossing sandy desert terrain better than their 26″er brethren were. The wheels seem to really excell at crossing loose sand, mud, and even snow. This is a direct result of many of the above mentioned benefits working in concert with each other, but is remarkable, so I mentioned it as a stand alone trait.

Geometry Quirks The positioning of critical frame elements on 29″ers results in a lower center of gravity in relation to the axles for the rider. This also results in a more stable feeling in corners and a less ï¿½endoï¿½ prone ride for riders choosing 29 inch wheels. It is also worth mentioning that the mere existence of 29″er steering conundrums has opened up a whole new facet for riders of 29 inch wheeled bikes, namely the ability to tune the steering characteristics of your ride.

There are many riders that hop aboard a 29″er and just decide that it works, others take awhile to ï¿½warm upï¿½ to them, while others find out it just isnï¿½t their cup of tea. Hopefully this brief list will help you to decide whether a 29″er is for you or not. But really, the best thing is to just go out and try one for yourself and see.

Happy Trails!
_________________
Veintinuevepulgadas!!!

"One lick from the lollipop of mediocrity and you suck forever"

Trecko · Posted: Sun Jul 19, 2009 6:55 pm Post subject:

Estoy de acuerdo!!

Lo mejor es correr una de esas 29er y comparar...

Se tu mismo el juez...
_________________
Disfruta la vida, es mï¿½s tarde de lo que crees...
Si te caes siete veces, levï¿½ntate ocho... y sigue pedaleando!!!...

cocotrok · Bicicletero Elite Joined: 09 Jan 2009 Posts: 649

estoy loco por tener una,pero no son baratas

Yetiman · Bicicletero Avanzado Joined: 19 Sep 2008 Posts: 178

Price Point tiene un cuadro 29 por 200 morlacos, unos aros 29 por 145 y horquillas 29 por 200!!! Asi pudes salir de las Rockallosas!!! Twisted Evil

ZAID · Posted: Tue Jul 21, 2009 8:18 am Post subject:

Consegui esta info en espanol, para los que le interese las 29er.

ï¿½29 Inchï¿½ o aro 29, la Mtb del Momentum

Viendo el mercado que se viene en bicicletas en el 2007, me llamaron la atenciï¿½n unas Cletas muy particulares, las ï¿½29 inchï¿½, como que a una Mtb comï¿½n le hayan crecido las ruedas, ï¿½veamos de que se trata?
Las ï¿½29 inchï¿½, es asï¿½ como se les dice a estas bicicletas; llevan ruedas aro 28 en vez de las comunes aro 26, se les dice 29 para no confundir las llantas de mtb con las de ruta, peroï¿½ ï¿½Que tiene de especial esto?, lee mas abajo.

Un poco de Fï¿½sica

Cantidad de movimiento o momentum: Esta propiedad estï¿½ asociada a la cantidad de masa que tiene un objeto y a la velocidad con que este se mueve; y es transferible de un objeto a otros. Es decir, una persona o un objeto pueden transferir momentum a un cuerpo. Para esto debemos interactuar con ï¿½l; dicho de otro modo, debemos ejercerle una fuerza..
Ahora bien, si todas las fuerzas sobre un sistema, sea este un cuerpo o un conjunto de cuerpos, se anulan entre sï¿½, es decir, la fuerza neta sobre el sistema es igual a cero, entonces el momentum del sistema se conserva, lo que significa que su cantidad de movimiento no cambia, es constante. Tambiï¿½n conocido como inercia de un cuerpo. Lo anterior se refiere a que, por ejemplo, si queremos mover una pelota de fï¿½tbol, debemos patearla. Si nadie patea la pelota, esta no se mueve. La acciï¿½n de patear la pelota implica que el jugador le transfiere momentum propio al sistema pelota.
Llevemos todo esto a la rueda de bicicleta, veras, la rueda 29 es de mayor diï¿½metro que la rueda 26 y entre mayor diï¿½metro es la rueda, menor es la energï¿½a que usas para mantenerla rodando, segï¿½n estudios realizados por Pepperdine University (http://www.pepperdine.edu/) por encargo de Gary Fisher. En la investigaciï¿½n encontraron que la rueda ï¿½29 inchï¿½ corre un seis por ciento mas rï¿½pido en subida y un tres por ciento mas rï¿½pida en circuitos de Cross Country que su hermana mas pequeï¿½a de aro 26, esto ocurre ademï¿½s por que la rueda, al ser de mayor diï¿½metro es menos afectada por piedrecillas, escombros, y terrenos suaves que una rueda de menor diï¿½metro.
Por lo tanto tener una rueda aro 28 en tu bicicleta de montaï¿½a significa incrementar el momentum, incrementar el momentum significa mas velocidad constante, aparte de mas agarre y estabilidad y mas velocidad significa mas diversiï¿½n en cualquier sendero o circuito en tu cerro o campo mas cercano.

Que significa tener 29ï¿½ en una MTB?

Mayor diï¿½metro de rueda, neumï¿½tico con mayor volumen, hace que el ï¿½ngulo sea menor al impactar obstï¿½culos y mayor, mas elongada la zona de contacto. El volumen del neumï¿½tico te permite correr con una menor presiï¿½n y te permite mayor tracciï¿½n en arena suelta, gravilla y nieve, el doblar en curvas cerradas o al seguir senderos no muy marcados.
Estabilidad. Estas ruedas en una bicicleta de montaï¿½a, hacen que esta tenga mayor control que las comunes Mtb. Las 29ï¿½ tienen una mayor lï¿½nea de apoyo en los neumï¿½ticos que las de 26ï¿½, esto provee un efecto de estabilidad, el tamaï¿½o de la rueda hace que la bicicleta tenga mas estabilidad y solidez cuando te enfrentas a escombros, rocas sueltas, surcos profundos y otras condiciones tï¿½cnicas del camino, segï¿½n los que las han probado, dicen que supera en muchos puntos a una 26ï¿½.
Simple. Te otorga un andar suave de trasera amortiguada a tu ï¿½hard tailï¿½, una gran ventaja para aquellos que les gusta hacer grandes viajes o un largo paseo al cerro.
Amplio rango de opciones de neumï¿½tico. Algunas personas piensan que no hay mucha oferta de neumï¿½ticos para las bicis 29ï¿½. La realidad es que la oferta de neumï¿½ticos para 29ï¿½con verdaderas caracterï¿½sticas para la montaï¿½a esta en expansiï¿½n, como las fabricas de bicicletas que estï¿½n agregando a sus catï¿½logos este tipo de bicicletas; ademï¿½s existe en el mercado una amplia gama de neumï¿½ticos de 700cc, desde los neumï¿½ticos para bicicletas de paseo hasta una entera gama de ciclocross, diseï¿½adas para barro y senderos de gravilla; neumaticos delgados para pavimento o turismo y por supuesto, unas con calugas y bien gruesas para xc o freeride.

Sin embargo, lo que he podido ver hasta ahora, que los inconvenientes de tener ruedas con mï¿½s diï¿½metro en el Mtb son:

a) La inercia de la rueda de mayor diï¿½metro: es mï¿½s difï¿½cil partir de cero, en subida y mï¿½s encima con barro o sobre gravilla con una rueda aro 28 que aro 26 (hagan la prueba).
Acumulaciï¿½n de barro: Actualmente no hay horquillas amortiguadas especiales para 29, eso si que ya estï¿½n en planes que para mediados del prï¿½ximo aï¿½o estï¿½n las primeras horquillas amortiguadas especï¿½ficas para 29, con el puente que une las botellas de la horquilla un poco mï¿½s arriba.

Algunas compaï¿½ï¿½as de bicicletas que fabrican las ï¿½29ï¿½

Gary Fisher ( son los que impusieron la moda), Cannondale ( con su nuevo modelo lefty 29), Black Sheep Bikes, Lenz Sport, Matt Chester, Voo Doo Cycles, Moots, Surly, Salsa Cycles, Walt Works, Wily Cycles, Curtlo Cycles, fabricantes independientes, Ventana Mountainbike Usa, Niner Bikes, Vicius Cycles, Kelly Bikes, White Brothers Cycling ( hacen horquillas especificas).
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ï¿½La vida es como la bicicleta, hay que pedalear hacia adelante para no perder el equilibrioï¿½.
Albert Einstein.
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cibuconet · Bicicletero Terminal Joined: 15 May 2009 Posts: 1005

buen artï¿½culo, gracias.

Sarria · Bicicletero Cronico Joined: 08 Apr 2008 Posts: 969

"So is the 26-inch hardtail dead?"
http://www.velonews.com/article/95579/mtb-nats-the-death-of-traditional-cross-country-bikes

astacio75 · Bicicletero Cronico Joined: 13 Sep 2008 Posts: 989

BigEye · Posted: Tue Jul 21, 2009 7:27 pm Post subject:

ï¿½Twenty-nine-inch wheel bikes will supplant 26-inch wheel bikes by 2017. In ten years, all mountain bikes sold from $1000 to $1500 and above will have 29 inch wheels. There will be holdouts, but the 29er will take the place of the 26 inch bike as far as the average mountain biker goesï¿½.

Chris Sugai
The Niner M.C.R. 9 Converting Nonbelievers
Mountainbike Action Magazine
March 2008

Dr.E.Castro · Bicicletero Master Joined: 16 Mar 2008 Posts: 366

voy a tener que empezar a escribir la cartita a santa ,niner wfo

Danny Valle · Posted: Tue Jul 28, 2009 1:37 pm Post subject:

Turner Sultan Wink

http://www.turnerbikes.com/09swf/bikes/img/09sultan_white.html
_________________
Veintinuevepulgadas!!!

"One lick from the lollipop of mediocrity and you suck forever"

John Doe · Bicicletero Palidoso Joined: 28 Jul 2009 Posts: 67

En el tiempo que llevo corriendo e visto como no se aceptan cosas nuevas. Vi como las single speed vinieron y se fueron y como las 29 llegaron y aunque quedan por ahi son bien pocas.

Si son tan buenas por que hay tan pocas en la calle?

Yo probe una de un pana y aunque cuando tiene viaje es una chuleria arrancarla me explota, en una ruta de parar y arrancar me esbarato pero cuando coje viaje es un coete.

Alguien a probado las 650b o 69ers?

Dr.E.Castro · Bicicletero Master Joined: 16 Mar 2008 Posts: 366

santa cruz tall boy full carbon

astacio75 · Bicicletero Cronico Joined: 13 Sep 2008 Posts: 989

astacio75 · Bicicletero Cronico Joined: 13 Sep 2008 Posts: 989

Danny Valle · Posted: Wed Jul 29, 2009 10:16 am Post subject:

Ventana El Chucho 69er !

_________________
Veintinuevepulgadas!!!

"One lick from the lollipop of mediocrity and you suck forever"

John Doe · Bicicletero Palidoso Joined: 28 Jul 2009 Posts: 67

Olvidate de las companias, aqui cuantas 29, 69 o 650b hay comparado con las 26? Saquen cuenta y me entenderan.