Speed Calculator

[jsmith2232]

Some of you might find this useful...
http://home.earthlink.net/~gellett/400ex.htm

[Carl_YFZ]

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[300exrider15]

can u do that for a 300 ex

[BlasterEaten250]

thats pretty sweet

[400exstud]

Nope. Only 250R, 400ex, ATC350x, Banshee, Cannondale, DS650, LT500R, Z400, 2001 Raptor, 2002 and up Raptor, and 1985 Tecate-3.

[zeppelin]

they should use 400exs for space travel

[EXevan91]

true keep the stock gearing but put in 50 inch tires :) fun

[BlasterEaten250]

i guess if you add a new rev limiter to a 400 you can go 81 mph.:ermm:

[Quad Boy 660r]

Cool, though I doubt my 03 Raptor does 80.71 MPH.

I hope it does.

[exrider008]

stock gearing on a 400ex is 15/38 right?

[BlasterEaten250]

Originally posted by exrider008
stock gearing on a 400ex is 15/38 right? si:chinese:

[400exstud]

Originally posted by BlasterEaten250
i guess if you add a new rev limiter to a 400 you can go 81 mph.:ermm:

Yup, on the project 450R Harlen put a vortex ignition (+1000 RPM) on and he gained 11 mph measured by a dyno.

[spent21]

that's all fine and well, but somewhere along the lines you have to have the horsepower available at the given rpm to overcome wind resistance, rolling resistance, and friction (assuming that you are running on flat ground.)

[Quad Boy 660r]

Originally posted by spent21
that's all fine and well, but somewhere along the lines you have to have the horsepower available at the given rpm to overcome wind resistance, rolling resistance, and friction (assuming that you are running on flat ground.)

Yeah. theres a lot of variables.

BTW, when it asks for how tall the tire is, is it front or back, or does it make a difference?

The fronts on my Raptor are 20s but the backs are 19s.

[pit/wood]

Originally posted by spent21
that's all fine and well, but somewhere along the lines you have to have the horsepower available at the given rpm to overcome wind resistance, rolling resistance, and friction (assuming that you are running on flat ground.) yeppers,theoritical speed and real world speed are just a bit different.

[zeppelin]

the calculator assumes you have enough power to pull the gearing tha you use. if you give a 100hp motor the same gearing as an xr50, then the top speed will still be the same. and the rear tire are the only ones that make a difference, bigger tires = taller gearing

[400exstud]

Originally posted by Quad Boy 660r
Yeah. theres a lot of variables.

BTW, when it asks for how tall the tire is, is it front or back, or does it make a difference?

The fronts on my Raptor are 20s but the backs are 19s.

It wants your rear tire height.

[bwamos]

Originally posted by 300exrider15
can u do that for a 300 ex

Use the "generic calculator" link at the bottom of the page and fill it out using the first window to setup for a stock 300ex. Then from there just change tire sizes and sprocket sizes for a comparison.