Me ha llegado la corona que voy a poner en la nueva rueda de 18″
Para usar el buje Talon no sirven ni la corona ni el disco originales, además prefiero dejar la rueda original completa por si la quiero utilizar con neumáticos mixtos.
Así que he pedido esta preciosidad de corona. Es un Renthall Twin Ring que combina la ligereza del aluminio en el centro con la dureza del acero en el exterior. No se cuanto pesa el original pero este son 633gr
Para mantener el mismo desarrollo que con la rueda de 17″ he tenido que aumentar en tres dientes la corona pasando de 45 a 48 dientes. Para calcularlo me pasaron esta web que es fantástica:
http://www.gearingcommander.com/
La cosa queda así:
De serie lleva un piñón de 15, la corona de 45 y rueda de 17″. Según esa web a 6000 rpm va a 158,5 km/h
También tengo un piñón de 14 que es el que utilizo normalmente si no tengo que hacer tiradas largas por carretera
Con el piñón de 14 va a 147,9 km/h.
Si usáis esa web veréis que con la rueda de 18″ lo más parecido es poner una corona de 48:
Con 15/48 a 6000 rpm va a 154,4 km/h
Con un piñón de 14 va a 144,2 km/h
La diferencia con la de 17″ son sólo 4 km/h
Ahora a esperar que llegue el disco y a probarla…
I have received the rear sprocket I ‘m going to fix in the new 18 » rear wheel .
In the Talon hub the OEM rear sprocket and brake disc doesn’t work, plus I prefer to leave the OEM wheel if I want to use it with road tires.
So I ordered this gorgeous sprocket. It is a Renthall Twin Ring that combines the aluminum lightness in the center with the hardness of steel on the outside. I don’t know the OEM sprocket weight but this one is 633gr.
With the 18″ wheel I have to increase three teeth teh rear sprocket if I want to maintain the same ratio I have in the 17″, from 45 to 48. To calculate this you ca use this great website:
http://www.gearingcommander.com/
The OEM has a 15 teeth front sprocket and 45 rear. According to that web at 6000 rpm will be 158.5 km / h
I have also a 14 teeth front sprocket which is what I normally use if I don’t have to do long trips in tarmac.
With the 14 / 45 at 6000 rpm the bike run at 147.9 km / h.
If you use the web you will see that to maintain this ratio with the 18” rear wheel you need a 48 teeth sprocket:
With 15/48 at 6000 rpm: 154.4 km / h
With a 14/48: 144.2 km / h
The difference with the 17 » is only 4 km / h
Now to wait the disc arrives …
I’m sure its lighter then the original. Do you know how heavy your bike is now?
Yes, it must be lighter because the center is aluminium.
No, I don’t know the wheight, I am looking for a place to wheight it but I can’t find it… but I’m still looking for it!!
Lookin’ good! I wish I could get this motorcycle and replicate your mods. You are building the type of motorcycle I want, unfortunately Yamaha N. A. doesn’t allow us to special order it.
Maybe just putting every wheel from the bike on a bathroom scales. A stupid idea but in theory I think it should work if you add on both measurements 🙂
I tried this way… but it doesn’t work: https://traildreamer.com/empezando-a-quitarle-peso-a-la-xt660z/
🙂
I’m sorry didn’t know that you already tried it….but I think with two bathroom scales it doesn’t matter if the bike is exactly horizontal. Maybe I’m wrong.
Probably you are right but I hav only one scale and my wife is going to be angry if I spoil it 🙂
I’m sure I’m going to find a more professional way to wheigt it but I prefer to wait till the bike is finished… hope very soon!
Cheers!