Remember Me? Results 1 to 9 of 9. Thread: Gear Ratio chart. Gear Ratio chart I think this is still accurate I'm sure someone will correct me if I'm wrong, lol. Member Mathematically the numbers are correct, however, I do not know whether those combinations will fit physically because of motor mount limitations. Funny because I mess with gearing on my electrics all the time, but more or less stick with stock gearing on my fuel powered RC's.

I'm sure a dremel rotary tool would cure any limitation in the motor mount adjustability though Speed costs money, how fast do you want to go? They should fit the stock spur is a 72 tooth and the clutch bell stock is a The chart above is spur and clutch bell teeth.

If I'm understanding this right, the Final Drive Ratio s is another way of saying the transmission drive ratios, right? One other thing, do the differentials have a ratio also or are they ? Any technology, sufficiently advanced, will appear as magic. The stock diffs are 2.

It took into account all the different gears and did the math for you. I will look for it. Last edited by Rickz96; at PM. The clicky chart says my Tmaxx top speed is 34mph in second gear but I am pretty sure my truck is faster then that LOL. Really cool! Originally Posted by Rickz What can I say Dust and Smoke screens Rule!

Censorship Advocate All times are GMT The time now is PM.Understanding the concept of the gear ratio is easy if you understand the concept of the circumference of a circle. Keep in mind that the circumference of a circle is equal to the diameter of the circle multiplied by Pi Pi is equal to 3.

Therefore, if you have a circle or a gear with a diameter of 1 inch, the circumference of that circle is 3. The following figure shows how the circumference of a circle with a diameter of 1. Let's say that you have another circle whose diameter is 0. You'll find that, because its diameter is half of the circle's in the figure, it has to complete two full rotations to cover the same 4-inch line.

This explains why two gears, one half as big as the other, have a gear ratio of The smaller gear has to spin twice to cover the same distance covered when the larger gear spins once. Most gears that you see in real life have teeth.

The teeth have three advantages:. How Maglev Trains Work. Prev NEXT. Understanding the Concept of Gear Ratio. This content is not compatible on this device.

They prevent slippage between the gears. Therefore, axles connected by gears are always synchronized exactly with one another. They make it possible to determine exact gear ratios. You just count the number of teeth in the two gears and divide. So if one gear has 60 teeth and another has 20, the gear ratio when these two gears are connected together is They make it so that slight imperfections in the actual diameter and circumference of two gears don't matter.

### Bike Gear Ratio Chart

The gear ratio is controlled by the number of teeth even if the diameters are a bit off.You see gears in just about everything that has spinning parts. For example, car engines and transmissions contain lots of gears. If you ever open up a VCR and look inside, you will see it is full of gears. Wind-up, grandfather and pendulum clocks contain plenty of gears, especially if they have bells or chimes.

You probably have a power meter on the side of your house, and if it has a see-through cover, you can see that it contains 10 or 15 gears.

### Differential Gear Ratio to Tire Size Guide

Gears are everywhere where there are engines and motors producing rotational motion. In this edition of How Stuff Worksyou will learn about gears, gear ratios and gear trains so that you can understand what all the different gears you see are doing. You can see effects 1, 2 and 3 in the figure above.

In this figure, you can see that the two gears are rotating in opposite directions, that the smaller gear is spinning twice as fast as the larger gear, and that the axis of rotation of the smaller gear is to the right of the axis of rotation for the larger gear. The fact that one gear is spinning twice as fast as the other results from the ratio between the gears, or the gear ratio Check out our gear ratio chart for more info.

In this figure, the diameter of the gear on the left is twice that of the gear on the right. The gear ratio is therefore pronounced "two to one". If you watch the figure you can see the ratio: Every time the larger gear goes around once, the smaller gear goes around twice.

You can see that if both gears had the same diameter, they would rotate at the same speed but in opposite directions. Gas-powered vs. Electric Cars: Which Is Faster? Are manual transmissions really faster than automatics? What are manual transmission synchronizers? Gears are generally used for one of four different reasons: To reverse the direction of rotation To increase or decrease the speed of rotation To move rotational motion to a different axis To keep the rotation of two axis synchronized You can see effects 1, 2 and 3 in the figure above.

Related Gas-powered vs.Often times these numbers are overlooked when buying a truck. These number reflect your towing capacity and will affect your fuel economy. What do these numbers mean? An article I wrote about oversized tires, gearing and MPG. In basic terms, a lower gear ratio coincides with a lower RPM while driving at speed. Lower RPM correlates to better fuel economy.

Great for the truck you drive to get groceries. In this case a lower gear ratio lowers the amount of weight you can tow. Which will cost you more at the pump but will give you more towing capacity.

There are other factors such as engine size. Type of engine, gas or diesel. Engine configuration V8 or I6. Automatic vs manual. However for this article I am going to focus on the 6, through 19, GVRW class range trucks that most of us drive. Plan on writing an article later on trucks and weight configurations. Visit Equipment page for a short video on replacing a cam shaft position sensor on the old 7. A daily driver that you may pull a boat with on the weekend should do fine with a 3.

However if your planning on pulling a 5th wheeler a long distance you best opt for a 4. Terrain is another consideration. If you use your truck for local work on mostly flat terrain you may be fine with a lower gear ratio. Here in the hills of TN, and being in the landscape business, I always opt for the high gear ratios. There are two ways to check. Below is the VIN tag on my little ranger. The axle code is R7. R7 is a limited slip with a 4.

Can you change your gear ratios? Prices will vary. The gearing must be properly calibrated and shimmed otherwise you may damage your investment. With newer trucks you may have to consider adjusting some of the engine and transmission programming.

The other thing to consider is resell along with correct documentation. For the most part a truck will do what you ask of it in the first place. In closing, most trucks will accomplish what you need it to.

Either check the ratio yourself or have a trusted mechanic look it up. The individual your buying it from may not have any knowledge of the gear ratio. BusinessEquipment. Truck weight class. Differential ratios 3. Popular Posts 1.A Gear Box is an assembly consisting of various gears, synchronizing sleeves and gear-shifting mechanism fitted inside a metal housing. Of which, the gearbox is an integral part. These components include the clutch, gearbox, couplings, propeller shaft, axle shafts, and differential.

The gear ratio is the ratio between the input and output gears. The driving gear and driven gears in a gear box define the gear ratios. The input gears get the drive from the engine and they rotate the output gears which, in turn, drive the wheels. The ratio of the number of rotations of output gear to the number of rotations of input gear is called Gear Ratio.

**HOW TO: Gear Ratios Explained - POWER REPUBLIC**

For e. Following is a chart of gear ratio found in an MUV 's gear box. The gear ratios vary from vehicle to vehicle. In trucks, the gear ratios are typically higher than cars as they have to carry the heavy load. A gear box contains gears of different sizes. In a gear box, the first gear is biggest in size and provides maximum torque output while producing minimum speed.

Hence, it is used when climbing slopes. All the gears between 1 st and last gear vary in size; in a decreasing ratio.

Thus, it provides a varying combination in terms of pulling ability and speed. So, the vehicle could be driven smoothly without any drop in its acceleration. The gear box basically improves the vehicle's driveability in all conditions. In contrast, the last gear or the top gear, at times an Overdrive, is smallest in size.

However, it provides minimum traction but maximum speed. A gearbox with an Overdrive means its output is higher than its input that connects to the engine. In other words, the overdrive gear rotates faster than the engine speed.

Thus, it provides higher speed and better efficiency as the engine runs at a lower rpm in relation to vehicle speed. In some advanced designs, there are more than one 'Overdrive' gears; usually two.

Thus, Dual Overdrive aka 'Double Top' provides even higher speed and better efficiency in a vehicle. The input gears are fixed on the countershaft making it a single unit. It drives the individual gears on the main-shaft which rotate freely on the bearings.

Thus, the gearbox passes the drive to the wheels depending upon the gear which engages on the main-shaft. When you push the shifter-sleeve towards the desired gear, that gear locks onto the main-shaft and rotates it.The way that gears interact with each other is important to know for anyone planning to make the most of them.

Most modern cars have gear ratios that were calculated with computers, but bikes and mechanical home projects do not. If you're mystified by gear ratios, it will help to know what a gear ratio is, and how it affects other parts of your mechanical device.

Where there are a number of gears meshing together, the number of teeth on them will form an important ratio: the gear ratio. When several gears are meshing together, they form what's called a gear chain. The ratio is only calculated from the first gear, the driving gear which is attached to the power source, and the last gear in the chain.

If you count up the number of teeth on gear one, and on gear X the last one and set them in a ratio 1:Xthis is the gear ratio. If the number can be reduced, you should reduce it, for example a ratio of teeth teeth reduces to The gear ratio is necessary for calculating the speed a given gear chain will produce. When you have that information, you have half of the information needed to calculate the speed. So, if you have the speed the motor is putting into the gears, you can very easily calculate the speed of gear X.

On a bike, you have a slightly different system: instead of a pair of gears meshing directly, they're attached by a pulley chain, but the gear ratio still applies. On a mountain bike, for example, you have a set of concentric gears attached to the pedals, and more gears attached to the drive wheel. The ratio of teeth on the wheel gear to the teeth on the pedal gear will still form a ratio--and if you pedal at a set speed on the bike, changing that gear ratio will change how fast you go.

In a gear chain, when there are a number of gears in the middle, something fairly interesting happens to the middle gears. You may have noticed that in the previous calculations, the only gears that are important are the first and last. This is because gears in between don't impact the speed--they'll go as fast or slow as they need to.

What they will change, however, is the direction: if there's an odd number of gears, the first and last will turn in the same direction. The benefits of knowing the gear ratio is that you can use that to your mechanical advantage. There is a trade-off between speed and torque, which is rotational power.Clock Gear Math Here is what we are trying to do: Make a device where the minute shaft makes one revolution every seconds.

That's it. Early clocks behaved this way with just a minute hand. It wasn't until much later that clocks were made with hour and second hands. Let's ignore the second and hour hands for a moment to make the calculations easier. Other hands are merely gear ratios to the minute hand. In our example the minute hand is the shaft with the 90 tooth gear.

This shaft makes one rotation every seconds or once an hour. Another simplification to make understanding the calculations clearer is to keep the units consistent.

In our case we will use seconds as our unit of time.

It is very easy to get caught up in minutes and hours getting all confused with dividing and multiplying by 60 that your head will spin. For example the minute hand rotates once an hour. Why isn't it called the hour hand. Because the hour hand rotates once every 12 hours. That's why.

## Differential ratios 3.73, 4.10, 4.88…

In our example the Escapement shaft makes one revolution every 60 seconds. It doesn't have to but many clocks use this shaft as the second hand. Then the gear ratio between the escapement wheel and the minute hand is then divided by Or Multiply the driving Wheels and divide by the pinions to get a 60 :1 ratio. OK, this is fine for Gary's Clock but what if I want to make a wall clock where the pendulum isn't so long? Maybe you've seen other clocks and wondered about the math behind the gear ratios.

Here is an explanation Some common gear practices. The smallest number of teeth on the pinion should not be less than 8. An even better scenario is where the pinions are not smaller than 12 teeth.

Small tooth pinions less than 8 teeth do not engage very well. See the gear animation page for more evidence. It is also uncommon to see gear ratios larger than 10 to 1 for regular spur gears. We could make a clock with a tooth gear and 10 tooth pinion as an example and still get a 60 to 1 ratio. A tooth gear is pretty large. The tooth gear with teeth similar in shape to our example would be 60 inches in diameter. A bit large. Let's look at two common gear trains. One with 3 shafts between the minute hand and escapement and another with 4 shafts.

Case 1- 3 shafts. This arrangement is the same as the one used in Gary's Clock. Remember the minute hand makes one rotation every seconds. The escapement shaft rotates faster than the minute hand by a factor determined by the gear ratio. Multiply the driving gears and divide by the pinions to get gear ratio.

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