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# How fast does a average atv?

#1
05-30-08, 01:32 PM
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Join Date: Oct 2005
Location: Costa Rica
Posts: 81
How fast does a average atv?

Go in first gear? I need to know because I need to gear an invention of mine so it will have good low end power. Just a pretty good estimate is what I need, nothing exact.
Thanks
Tornerito

#2
05-30-08, 01:42 PM
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What are you asking? How to gear an ATV down for low end torque? You aren't providing much information here.
What kind of ATV is it?

#3
05-30-08, 07:06 PM
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Join Date: Oct 2005
Location: Costa Rica
Posts: 81
sorry...

Ok lets make it a bit clearer. I built myself a small fourwheeler.
And I am in the process of putting a different motor in it.
It had a 5Hp now I'm going 6hp and a better engine. But I have an engine and a separate 5 speed transmission, so I can play with engine to transmission ratio. What I want to know is, what should my speed in mph be in first gear? I to gear it so it has good performance in first gear (Mud, steep terrain) Top(5th gear) speed is not really an issue. So I need to Know what for example is the "normal" (I know it varies with make, model, 2/4cycle .etc) at which a gear change (1st-2nd) is usually necessary.
Now maybe that made it even more difficult to understand

#4
05-30-08, 07:20 PM
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Take your engine rpm and do the math according to the gear ratios and tire diameters you have. That's the math taught in junior high school.
Example:
engine rpm=3000
gear ratio=10 to 1
output rpm=300

Then you have output rpm and axle ratio, then tire diameter.
Figure out how many inches around the tires are, how many tire revolutions it takes to go 1 mile, and the rpms of the tires.

#5
05-30-08, 07:27 PM
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Join Date: Oct 2005
Location: Costa Rica
Posts: 81
Originally Posted by oneofamill
Take your engine rpm and do the math according to the gear ratios and tire diameters you have. That's the math taught in junior high school.
Example:
engine rpm=3000
gear ratio=10 to 1
output rpm=300

Then you have output rpm and axle ratio, then tire diameter.
Figure out how many inches around the tires are, how many tire revolutions it takes to go 1 mile, and the rpms of the tires.
Ok I don't need to know how fast it will go. I already have all that ratio deal done. What i need to know is what i an ideal 1st gear speed so I can gear accordingly.

#6
05-31-08, 07:33 AM
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Join Date: Feb 2001
Location: SW Fla USA
Posts: 11,588
Some help maybe:

http://www.atvriders.net/atvtopspeeds.htm

I'm thinking if you top out at 15 mph or so in 1st, you'll have a fair amount of pulling power.

#7
05-31-08, 07:40 AM
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Join Date: Oct 2005
Location: Costa Rica
Posts: 81
Hey!

Perfect, perfect,
Thanks a million
Tornerito

#8
05-31-08, 07:47 AM
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Join Date: Feb 2001
Location: SW Fla USA
Posts: 11,588
That's why they pay me the BIG bucks.

Be sure to post back how it turns out, etc.

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