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bigger tires
I have a ele club car ,with 8 inche tires it will do 19 .2 mph............soooo if I put on 10 inche tires will I go 22-23 mph??? I know someone has done this. thanks:gc::gc::gc:
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about 2 mph faster
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That means at 60 miles per hour you could be two miles further.
The math would suggest saving your money! |
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here is a speed calculator that will answer your question SPEED CALCULATOR |
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If you switch to 205 65-10 tires you will increase your speed by approximately 2.5 mph. If you buy 205 50-10 tires you will not see any speed increase. |
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bigger tires
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The mph speed will increase because the effective distance covered will be greater at the same engine RPM than as a smaller diameter tire. |
The speed of the tire rotation is determined by engine RPM. That would not change by increasing tire/wheel size. However, the actual speed of the cart will increase. Thereby making the speedometer give you a false low reading. Still reads 20mph, but now traveling 22mph.
This was an important thing to remember when we all put larger tires on our cars back in the 70's. You might get a speeding ticket because you are going faster than you think. |
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bigger tires
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Actually, the rotational speed of the tire will increase with a larger tire given the same RPM as the smaller tire. Your 70's car showed a false mph because the speedo gear was driven off the tranny. |
If you have a smart phone you can check your cart speedometer with your phone's GPS speedometer to see how accurate it is. Yes there is an free APP for a GPS speedometer.
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My house came with a Par Car with 8 inch tires. Top speed was 17.5 with no way to make it faster until I put 10 inch tires on the back. Picked up 2 mph. Ciearance kept me from changing the front tires to 10 inch, but it rides just fine the way it is. Found matching hubcaps for both sizes.
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If the tire RPM stays the same, then wouldn't actual speed change be a function Pi *D.
3.14* 10/3.14* 8 ? |
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Geez, the mph or distance traveled in a given amount of time is a function of the tire circumference and RPM. Hence a larger tire will travel a greater distance then a smaller one at the same RPM.
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Your screwing this guy up by not explaining the aspect ratio difference. A 65 aspect ratio will have a larger overall diameter then a 50 aspect ratio. That's why the 65 travels faster. |
I suspect you have all the information you need by now :)
If you want another option, consider leaving the standard tires and spending about $225 on a Plumquick Bandit rebuild or new Plumquick motor ($325). High Speed & Performance Electric Golf Cart Motors & Motor Controllers - Plum Quick Motors Understand with that motor, you are now not a legal golf cart (by definition) since you can exceed 20 MPH, so you have to understand and accept all of the consequences. It is not my intent to preach, just make you aware. FYI, you will not be the only one out there who can go 23 MPH. |
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Bobs Golf Cart Speeometers is exactly correct. Changing tires and wheels too 205-65-10
On a Club Car will result in a speed increase of 2.5 MPH. Speedometers are calibrated in MM of the circumference of a wheel and tire will spin at the max that the carts controller will allow, the increase of rubber on the road with the larger assembly will result in the additional 2.5 MPH. |
thanks frank
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So the speed cart gains on straight and level may be countered when you climb hills with slower speed and more load on the batteries? On gas carts the governor will kick in and speed the cart up to almost governed speed within few ten thousands. |
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Something else I noticed on the star? Tires had severe in and outside wear on the back? |
As has been pointed out, the increase in speed is minimal. Somewhere around 2 mph. But you will get a smoother ride. Small bumps are not felt as much with the larger tires.
Make sure that you have enough clearance. With larger tires you may experience the tire hitting the wheel well when you hit bumps. You may need to lift the cart a bit. |
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The switch probably killed half the motor poles thereby increasing your speed. A lot cheaper then an overdrive. |
Cheap, accurate speedometer.
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Increasing the size of the tire can be problematic with Club Cars, not because in increases the speed a bit, but because the wheel well clearance is so close to the 8" tires. Oversize tires require a "lift kit" to raise the cart so the tires won't rub the wheel well when you turn.
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Thus if the speedometer is calibrated to think you are going 20 mph at an engine RPM of 4850 with a certain sized tire, and you put a bigger diameter tire on the vehicle, you will then be actually going faster over the ground at that 4850 RPM but the speedometer (not knowing you have changed the tire size) will not be changed but will still be reading "20 mph" at the 4850 RPM engine speed even though you are really traveling faster than that with the new bigger tires. |
If you are talking about a golf cart, that is not the way it works, at least on my Yamaha. On my Yamaha, and I assume this is true for most if not all golf carts, there is a sensor on the front suspension that measures tire rotations. When the speedometer/odometer is setup, the tire diameter is entered. With the tire rotation rate and the built in timer, the speed is a trivial computation. There is no need to know the engine RPMs.
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I worked in the auto industry for 38 yrs. & I'm no expert on drive trains but it makes sense to me that 8 in. tires will make the rear axle run faster & your engine will only pull the cart as fast as the engine will let you but 10 in. tires spin the rear axle slower so in turn the engine will spin the rear axle faster because the bigger tires will spin the axle less times. I asked this same question to my salesman when I bought my golf cart & he said bigger tires make no difference. So what's the difference, better ride? I disagree with the salesman. Bigger tires will make your cart run a little faster. The only con I can see is, don't complain if you get pulled over for going over 20 mph.
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For example, if the outside diameter of a tire was 12" the the circumference would be approximately, 18.85" A tire with a 14" outside diameter would have a circumference of 22". The 12" tire would travel 18.85 inches every revolution and the 14" tire would travel 22". Assuming that the speed of the revolutions is the same, the larger tire would travel 18.85 inches sooner then the smaller tire. Or, the larger tire would travel 22" in the same time that the smaller tire travels 18.85 inches. Either of which is the definition of going faster. The argument might be that putting on a larger tire may make the axle turn slower because of the weight. If that's the case, then we'd have to know exactly how much slower the axle turns and exactly how much further a point on the outside of the tire moves to determine whether the cart will go slower, faster or the same. But, in my experience and in the experience of most experts that I've spoken with, larger tires will give you a bit more speed. In other words the amount that the axle is slowed down, if at all, doesn't offset the additional distance the tire will travel. Another point is that if you put larger tires on the back of the cart and not on the front and your speedometer is attached to the your front tires, no adjustment to the speedometer needs to be made. The speedometer is simply measuring how many revolutions the tire is making and multiplying that to how far each revolution make the cart travel. |
I would wonder if a cart was designed for 8 inch tires and 10s are put on, do you put more strain on the motor?
Also, if you are going on a 3 mile trip, you would save about a minute of travel time, and that assumes you are the only cart on the trail. Since there usually are other carts you will catch up to that are going at 20, or slower, the time saved is relatively negligible, and probably not worth the expense. |
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All I know is two posters with golf cart repair/service experience have stated that larger tires/wheels will give you a little more speed.... good enough for me.
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A voice of reason and logic within a thread of misunderstanding and chaos. |
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If the OD of a tire is 12 inches, the circumference is 37.7 inches. If the OD of a tire is 14 inches , the circumference is 43.98 A more real world example is the stock tires on an 8 inch rim that came with my Club Car versus the bigger 205-65-10 tires on 10 inch rims. Stock tires: 18 diameter has a circumference of 56.55 205-65-10: 20.5 inch diameter has a circumference of 64.4 I go about 8 inches further with the larger tires during one revolution. |
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