The Narrow/Wide chainring /Mundial de ciclismo toscana preselecciòn españa

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SRAM didn't actually invent the chain-security-enhancing alternating tooth thickness concept used on its XX1 chainring. As such, the company doesn't hold a patent and there's a flood of other labels now following suit. Race Face's Narrow/Wide chainring is one of the most recent examples and it's an outstanding choice for 1x riders who want to ditch their chain guide.

The idea behind the Narrow/Wide chainring is the same as SRAM's X-Sync: alternating teeth are made extra-wide to more fully fill the gap between the side plates as the chain passes through. Meanwhile, all of the teeth are also a bit taller than usual to further prevent derailment. It's a gloriously simple concept and best of all, it actually works.
We tested the Narrow/Wide chainring on several bikes over a wide range of situations, from general cross-country riding all the way up to six straight hours of lift-assisted downhill runs at Trestle Bike Park in Winter Park, Colorado. Even with no chain guide in place – but with a clutch-equipped rear derailleur – we never suffered a single dropped chain.That being said, we'd still recommend running at least some sort of minimal guide for full-on downhill racing or burlier enduro courses.

This sucker runs whisper-quiet too, with well-shaped teeth that carefully keep the chain on track regardless of what cassette cog you're using, plus no sliders or pulleys from a supplemental chain guide – which also cuts weight – to create any additional racket. Durability has been pretty good, too, with average wear over a couple of months of regular use.

http://www.bikeradar.com/mtb/gear/category/components/chainring/chainring-mountain/product/review-race-face-narrowwide-chainring-13-47573

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Preselección de España para el Mundial de Toscana
en Destacada, Noticias ESP 13/09/2013 0 106 Lecturas

Alejandro Valverde, Jonathan Castroviejo, Jesús Herrada y José Herrada (Movistar), Samuel Sánchez y Egoi Martínez (Euskaltel), David Arroyo (Caja Rural-Seguros RGA), Joaquim “Purito” Rodríguez, Dani Moreno y Ángel Vicioso (Katusha), Alberto Contador (Saxo), Luis León Sánchez (Belkin), Juan Antonio Flecha (Vacansoleil) y Xabier Zandio (Sky) es la preselección de 14 corredores para el Campeonato del Mundo de fondo en carretera de Toscana -Florencia, 29 de septiembre- que ha anunciado el técnico español Javier Mínguez en una rueda de prensa en la sala de prensa de la Vuelta a España en Oviedo.
“Valverde y Purito liderarán a España, el circuito es muy selectivo y les va fenomenal”, dijo el veterano técnico vallisoletano que debutará en Italia en su nuevo puesto sucediendo a José Luis de Santos. Mínguez quiso dejar claro que “la UCI nos obligaba a dar hoy la preselección de 14 corredores y eso es lo que tenemos. No he querido adelantar plazos, ya que nos queda el final de la Vuelta a España y las pruebas de Canadá. Además, quiero terminar de hablar con los corredores”, antes de anunciar la lista definitiva que será a mediados de la próxima semana.
Mínguez confirmó la presencia de Luis León y Castroviejo en la contrarreloj, el miércoles 25, aunque “no es seguro al cien por cien que vayan a hacer la prueba de línea. Es posible, pero todavía no he tomado la decisión”.

http://www.ciclo21.com/preseleccion-de-espana-para-el-mundial-de-toscana/