Hola , tengo una duda que espero me solucioneis. me ha dicho un mecanico que no se me ocurra echarle grasa a los componentes como eje pedalier direccion,etc en un cuadro de carbono ya que la grasa estropearia el carbono ¿que tiene esto de cierto? ¿se puede engrar sin problemas o no?. Me gustaria que alguien entendido me conteste. Gracias a todos
Pues si, el tendero tiene razón...se te puede inflar, separarse las capas,etc.Sé que existe algún compuesto especial para esto, pero la grasa de siempre no la uses con el carbono.
Pero hombre tu lo que engrasas en el eje pedalier y la direccion no es de carbono, son roscas y pistas de rodamientos que normalmente es de aluminio, acero etc. Creo yo.
¿¿Cómorrlll? Lo que no se debe de utilizar es grasa en uniones entre componentes de carbono, por ejemplo, y especialmente, entre una tija de carbono y un cuadro de carbono. Lo que también se hace extensible entre uniones carbono potencia-manillar. Existe no obstante un producto para estos casos, pero es específico para uniones entre carbono-carbono. http://www.cannondale.com/asset/iu_..._carbon_seatpost_installation_technote_en.pdf Pero si es aluminio y carbono has de dar grasa para que con el tiempo no solidifiquen los componentes en distintos materiales (por el foro hay gente que puede dar testimonio de estos casos). Yo engraso -como hace todo el mundo- el juego de dirección ahead de aluminio a la horquilla de carbono, cuyo tubo tambiéne es de carbono, y te puedo asegurar que el carbono con la grasa no sufre ningún daño. A ver si nos estamos liando con eso de que la grasa (de litio, y no todas) ataca las gomas, y pensamos que el carbono por ser plástico... Un saludo desde Ribadeo.
Eso es lo que hago yo para las uniones carbono-carbono en el mercado hay una grasa especial para estas uniones, yo utilizo de la marca morgan blue.
Para las uniones carbono - carbono y carbono aluminio hay una grasa espifica con particulas especiales para evitar q se solidifiquen, ritchey y fsa la comercializan ademas de otras marcas. Sobre lo del eje de pedalier las roscas de aluminio o de acero si que hay q engrasarlas ya que no es union de carbono. Un saludo
La discursión es principalmente por las tijas de asiento en fibra carbono, pero es extensible al material en sí, eso si, que cada uno haga lo que quiera. Saludos Here are responses from some carbon-seatpost makers. From Easton: No grease on carbon posts. Grease contains certain minerals that can attack clear coats, can penetrate the resin matrix and could cause swelling of the composite laminate. Can you say "stuck seat post?" Don't use grease. John G. Harrington Vice president, bicycle products Easton Sports, Inc. From Campagnolo: No grease. In some cases it can be dangerous to use grease as the chemical composition can cause a reaction between materials. Besides, it increases the torque required to clamp the post. Richard Storino Campagnolo USA From Deda: Absolutely no grease on carbon, ever. Also, do not use solvents to get old grease off, or to get old grease out of the seat tube. John Harrington of Easton and I believe that many solvent residues in the seat tube soften the gel coat of the carbon, then bond the gel coat to the inside of the seat tube, freezing the seat post in position for eternity. Tom Franges Deda Elementi North America tech support From Bontrager: There are some petroleum greases that are slightly acidic. That acidity can attack the resin used in carbon-fiber construction (frames or posts). This same acidity can attack aluminum or steel frames components, too. However, most greases are engineered to be slightly basic. Neither Trek's nor Bontrager's carbon resin is affected by this acidity. The main reason we suggest you don't use grease on any seatpost inserted into a Trek OCLV frame is that there is not enough surface roughness inside the seat tube to ensure your post stays where you put it. Scott Daubert Trek team liaison However Scott sell seatpost grease Scott Carbon Grease Fisher outdoors supply a grease made to prevent bonding of one object to another. http://www.fisheroutdoor.co.uk/publ....html?Fisherpublic=6r970r5l03c1ghr5i0nptqvom2 the grease from scott seems to be different from other greese ie scott if for stopping them from bonding and help stop slipping and normal greese it used to help parts move freely.... i dont think there would be a problem with scotts grease.. When i built up my road bike I put the carbon post in without using grease. The stupid thing is now stuck solid. I have just bought my new carbon scott from Kudu bikes and he told me there not to grease the seat tube with conventional grease, he used the above mentioned scott grease that has a gritty texture to it. Also, don't forget the Pace Carbon grease. It is also (supposedly) carbon friendly and will hopefully prevent/limit the chances of bonding and slipping. Can't seem to find it on their website though. For other tips on carbon see here. Carbon Bicycle And Component Care - Action Wheels Bike Shop Includes some good tips too. yep, Pace carbon grease- see here http://www.18bikes.co.uk/images/eighteen.gif "A small tub of blue goo to you, but a life changing synthetic suspension of friction increasing polymer globes as far as your sinking seatpost is concerned. A thin smear is enough to reduce clamping torque on carbon or alloy seatposts by up to 30%, minimising the risk of crush or cracking damage and keeping your seat height right for ride after ride" Specialized say "no grease" for their carbon posts. What if your previous post was greased, how do you remove all the grease from the seat tube? i read there is a friction grease for carbon posts Pace have some out soon IIRC finishing line degreaser on a rag wrap around a stick and plunge down the seat tube..
