quote:

---

Originally posted by TimEmo
back to the wheel circumference
u forgot to add the tyre twice cuz its on both sides of the tyre so
u'd get
16 * 25 + 195/100 * 80 = 596 diamter
* pi to get teh cicumference

---

quote:

---

Originally posted by AuroraSport

quote:

---

Originally posted by TimEmo
back to the wheel circumference
u forgot to add the tyre twice cuz its on both sides of the tyre so
u'd get
16 * 25 + 195/100 * 80 = 596 diamter
* pi to get teh cicumference

---

bollocks you're right

so its 0.0011628589 miles afterall

---

quote:

---

Originally posted by CorsaB4ever
yes but its the surface area that needs to be accounted for not the circumfracne beacuse 2 wheels with the same cirucmfracne will turn at diff speeds if they have different surface areas

---

quote:

---

Originally posted by Rob H
Gear boxes turn at a different speed to the engine.... well actually the input shaft (from the engine) turns the same speed as the engine, but the output shaft turns at a different rate, depending on the Gear your in.

Basically the gear box is a torque multiplier to transfer the torque from the engin into a usable torque that will turn the wheels.

1st gear is rougly 3:1 ration, so for thee turns of the input shaft, you get one turn of the Out put shaft. Fourth is usally a 1:1 ratio, so for one revolution of the input shaft, you get one revolution of the output shaft. Fifth is usuall an overdrive gear, where by the output shaft turns more than the input shaft, arouns 0.8-0.9:1 ratio.

The output shaft however then goes on to a final drive gear which brings the speed of the engine relative to the wheels even lower. The Differential can also be used to further increase the relative speeds .

---

quote:

---

Originally posted by Dean_W

quote:

---

Originally posted by CorsaB4ever
yes but its the surface area that needs to be accounted for not the circumfracne beacuse 2 wheels with the same cirucmfracne will turn at diff speeds if they have different surface areas

---

---

quote:

---

Originally posted by Dean_W
Surface area? As in the tyre?

---

quote:

---

Originally posted by CorsaB4ever
to get an acurate distance of how far a wheel will travel from one rpm, you would need to consider the surface area of the whll as opposed to just the circumfrance,

---

quote:

---

Originally posted by CorsaB4ever
yes but its the surface area that needs to be accounted for not the circumfracne beacuse 2 wheels with the same cirucmfracne will turn at diff speeds if they have different surface areas

---

quote:

---

Originally posted by Robin
surface area has nothing to do with it.

---

quote:

---

Originally posted by Rob H

quote:

---

Originally posted by CorsaB4ever
to get an acurate distance of how far a wheel will travel from one rpm, you would need to consider the surface area of the whll as opposed to just the circumfrance,

---

You'd need to know the ditance traveled by both wheels, but don't need to know the area of the tyres. I can see where you were going though, but for the accuracy required by Corsasport, I think travelling in a straight line would be an adequate assumption .

---

quote:

---

Originally posted by Robin

quote:

---

Originally posted by CorsaB4ever
yes but its the surface area that needs to be accounted for not the circumfracne beacuse 2 wheels with the same cirucmfracne will turn at diff speeds if they have different surface areas

---

a 195/45 16 wheel/tyre combo and another 195/45 16 wheel/tyre combo will rotate once over the same distance, providing the tread depth and tyre pressure is the same, surface area has nothing to do with it.

---