SPEED CALCULATOR

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SPEEDS IN GEARS with

10 inch WHEELS and STANDARD 3.23 REAR AXLE

10 inch WHEELS and HIGH RATIO 2.78 REAR AXLE

12 inch WHEELS and STANDARD 3.23 REAR AXLE

SPEED IN GEARS EXAMPLE for TRIKE OWNERS WITH RELIANT 850 ENGINE

14 inch WHEELS ; 165/60 X 14 and STANDARD 3.23 REAR AXLE

15 inch WHEELS ; 205/50 X 15 and STANDARD 3.23 REAR AXLE

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SIDE BY SIDE SPEED COMPARISON of 10 , 12 , 14 and 15 inch WHEELS

Side by side speed comparisons of 10 , 12 , 14 and 15 inch wheels

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Click Here for Speed Calculator Link

While I cannot guarantee the accuracy of the outcome ,

I believe it is probably accurate .

Some wee snippets of info for use on the calculator above ;

GEARBOX ; STANDARD RATIOS { 850 }

1^st ; 3.88 ...... 2^nd ; 2.05 ...... 3^rd ; 1.32 ...... 4^th ; 1.00

and

AXLE ; STANDARD RATIO { 850cc } ; 3.23

AXLE ; HIGH RATIO { 850cc } ; 2.78

AXLE ; STANDARD RATIO { 750cc } ; 3.545

AXLE ; REGAL SPLIT CASE TYPE ; 4.354

and

TYRES { STANDARD 10 INCH }

WIDTH ; 1.45

ASPECT RATIO { PROFILE } ; 80

DIAMETER ; 10 inches

TYRES { STANDARD 12 INCH }

WIDTH ; 1.45

ASPECT RATIO { PROFILE } ; 70

DIAMETER ; 12 inches

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The following is the copy of the page you will see when you go to the brilliant link above

The Gear-Tire-Speed Reference Tools

cribbed, not authored, by yours truly

This program is for calculating the speed (MPH) for a given transmission gear and differential. All calculations are round up. Calculations are to be treated as approximate only.

To use this program you need to key in five (5) pieces of information. The tire size of the driven wheel (tread width, sidewall ratio, and wheel rim diameter) transmission gear ratio and differential ratio (final drive). This information can then be used to compare different tire and wheel combinations to tranmission gears and differentials.

The following is an example to help to decode a tire size like 185/65R14

185 = tire width in millimeters, measured from sidewall to sidewall

65 = sidewall ratio, the ratio of sidewall height to tire width

14 = wheel rim diameter in inches

The transmission gear ratio needs to be expresses in a decimal formate, like 1.444.

The differential ratio needs to be expressed in a decimal formate, like 3.444. If you have the number expressed as a ring and pinion like 7:31, you need to calculate the ratio by dividing the second number (31) by the first (7) to come up with the correct format and in this case it would be 4.429.

After keying in the five (5) pieces of information, click on the "Show Speed" button below to start the calulations.

Gear Speed Data Entry Section

Step 1: Key in the following information.

Step 2: To calculate the speed, please click on the "Show Speed" button below.

Step 3: To see the results of the calculations SEE BELOW:

Gear Speed Information Section

To calculate or compare different gears and transmissions, go back to the Gear Speed Data Entry Section and type over the information you want to change. After making the changes, click on the "Show Speed" button to recalculate.

To reset this form, click on "Clear Form" button below.

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ALTERNATIVE SPEED CALCULATOR

http://www.cargister.com/calculator-gear-ratio

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