Bigger wheels accelarate faster?

  • Thread starter JacquesVosser
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In summary, A larger wheel will result in slower acceleration and higher top speed if the engine has enough power. On the other hand, a smaller wheel will result in faster acceleration but may reduce top speed. The weight of the wheels is largely irrelevant; what matters is that changing the wheel size affects the gear ratio. Going from a 28" to 30" tire diameter is equivalent to swapping a 4:56 gearset for a 4:11 unit. The difference in performance also depends on the torque provided to the ground and the moment of inertia of the flywheel.
  • #1
JacquesVosser
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HI i live in South-Africa and a few of us guys have been fighting on a car club about something...
I say that if you get 2 of the same cars (Ford Fiesta ST150) which has a standard of 17" wheels. Now you keep the same wheel on the one car and on the other you change the wheel to a larger wheel (Same weight) the the standstil accelaration would be faster on the larger wheel.They say that a larger wheel makes the top end faster and the standing start slower?

So the question is: Does a bigger wheel make my car accelarate faster from standstill but be more slower on top end?


Hope to hear from you soon.

Jacques
 
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  • #2
You've stated it both ways in your posts.

A larger wheel will result in slower acceleration and higher top speed if the engine has enough power. If not, at least the top speeds in each gear but the last will be higher.

A smaller wheel will result in faster acceleration if tire spin doesn't become an issue, and top speed may be reduced if the car was properly geared for top speed before the wheel change.
 
  • #3
And the weight of the wheels is largely irrelevant, unless there's a huge difference such as tungsten vs. magnesium rims. What matters is that changing the wheel size (and this means tire diameter, not the rims) alters the gear ratio. Without using the actual numbers, going from 28" to 30" tires would be equivalent to swapping your 4:56 gearset for 4:11 unit. Again, those are made-up numbers. By following the power train from engine to ground, you can figure out the actual ones.
 
  • #4
Danger said:
And the weight of the wheels is largely irrelevant, unless there's a huge difference such as tungsten vs. magnesium rims. What matters is that changing the wheel size (and this means tire diameter, not the rims) alters the gear ratio. Without using the actual numbers, going from 28" to 30" tires would be equivalent to swapping your 4:56 gearset for 4:11 unit. Again, those are made-up numbers. By following the power train from engine to ground, you can figure out the actual ones.


WHat wil be the defference on a car that puts out 118KW at the flywheel? if you go from a Standard mag+Tyre 205/40/17" to (new mag) 215/35/18" ??

The reason why i thought it would be faster on lower speed is cause like i bicycle when you give an amount of force on a bigger wheel it moves easier and the distance is a bit more that it covers on the road?
 
  • #5
JacquesVosser said:
HI i live in South-Africa and a few of us guys have been fighting on a car club about something...
I say that if you get 2 of the same cars (Ford Fiesta ST150) which has a standard of 17" wheels. Now you keep the same wheel on the one car and on the other you change the wheel to a larger wheel (Same weight) the the standstil accelaration would be faster on the larger wheel.They say that a larger wheel makes the top end faster and the standing start slower?

So the question is: Does a bigger wheel make my car accelarate faster from standstill but be more slower on top end?


Hope to hear from you soon.

Jacques
Bigger wheel is equivalent to a higher gear; go faster ultimately, but take more time accelerating. Think of the radius as a lever arm.
 
  • #6
If the transmission and wheel size are matched to provide the same torque to the ground (to eliminate the complication Danger pointed out), the wheel with the lower moment of inertia (typically the smaller one) will provide better acceleration. Moment of inertia is resistance to rotational acceleration.

If the wheels and gear ratios aren't matched, you also have to consider the moment of inertia of the flywheel. Also, this is all moot if the limiting factor is the friction of the tires.
 

1. How do bigger wheels accelerate faster?

Bigger wheels have a larger circumference, which allows them to cover more ground with each rotation. This means they can achieve a higher speed in a shorter amount of time compared to smaller wheels.

2. Is it true that bigger wheels have better acceleration?

Yes, it is generally true that bigger wheels have better acceleration. However, other factors such as the weight of the vehicle and the type of surface being driven on can also affect acceleration.

3. Can I increase my car's acceleration by installing bigger wheels?

Yes, installing bigger wheels can potentially improve your car's acceleration. However, it is important to consider the overall weight and balance of the vehicle, as well as any potential modifications needed to accommodate the larger wheels.

4. Are there any downsides to using bigger wheels for acceleration?

One potential downside is that bigger wheels can add extra weight to the vehicle, which can impact its overall performance and fuel efficiency. Additionally, bigger wheels may also require more power to rotate, which can affect acceleration.

5. Do bigger wheels always result in better acceleration?

Not necessarily. While bigger wheels can generally improve acceleration, there are other factors that can also affect it, such as the type of tires, the condition of the road, and the engine power of the vehicle. It is important to consider all of these factors when looking to improve acceleration.

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