Theorectical top speed of a bike

[Whosthedaddy]

Is there an equation or calculation that can be done to estimate the theoretical top speed of any bike given the engine size and capacity, wheel diameters, dry weight, riders weight etc
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Current : MSX 125 Past : CBR 900RR Monkeybike : c50 LAC : ZXR750 H2 : FZR600 : ZX7R P3 : YW100 : TRX850: Trophy 900 T309 : GSXR 600 L0: Monkeybike : XJ6S Whosthedaddy

[0ddball]

There are plenty of good flash ones on the net where you just plug in the numbers. Try motorcyle top speed calculator in google.

The theoretical speed is independant of bike and rider weight, and even engine power. It is purely a product of max engine revs and gear ratio's.

To get a pretty accurate idea of a true top speed you have to factor in engine power and resistance factors. But weight is still irrelevevent.

[simonthepiema...]

I've never understood the whole weight is irrelevant although I think its true. what if you have a 600 bike with 90bhp and 180kg weight against the same engine and gear ratios but weighing 1 ton. The 1 tonner wouldnt have the poqwer to reach its max speed surely? Assuming they're both the same dimensions but maybe the second bikes made of lead or something

Anyone explain?? I should have paid more attention during those physics lessons at school

[NSR-Rulez]

https://www.cosportbikeclub.org/misc/SpeedCalc.html

Dont use that one, apparently the top speed for my NSR is 217.2mph

Great, i have the fastest NSR 125

I think not.


NSR-Rulez
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Past: 1985 Suzuki GS 125 + 2002 Honda NSR 125 R-2 + Ford Fusion
Present: Honda CBR 600 RR-5 + Suzuki SV650S-K4 + Mitsubishi FTO GPX

[cagiva gezzer]

Here is mine for the mito. Just subsitute your gearing information.

Also, someone elses tzr chart, which makes pretty graphs. Not sure about the marcos in it though.
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"because one stroke isnt enough and four strokes waste two"

[Andy C]

you can work out how fast the bike be going redline in 6th if you know the gearing and wheels. Like my SV (RIP) would go 150mph BUT the bike couldnt redline in 6th only 7k rpm so reached 130mph
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99 RS125 --> 02 SV650s --> 03 Speed Four --> 92 RXS100 --> 93 CB400sf --> 01 CB600f Hornet

[Jack_Cheese]

[Whosthedaddy]

I know that the theoretical top speed is gonna be different from the actual top speed achievable, need to get a pen and paper out to work out the various numbers needed to crunch.

Thanks fellas
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Current : MSX 125 Past : CBR 900RR Monkeybike : c50 LAC : ZXR750 H2 : FZR600 : ZX7R P3 : YW100 : TRX850: Trophy 900 T309 : GSXR 600 L0: Monkeybike : XJ6S Whosthedaddy

[McJamweasel]

[lilredmachine]

On my 4t 125, the long 6th gear is good for 90-95 MPH, of course the most i have ever seen on the clocks is about 87 down a large hill. It doesn't get to within 2 k of the 11.5 k redline.
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Bikes: too many, too much for one man to maintain anyway.

[0ddball]

[0ddball]

[BanditsHigh]

Here's my version, displays in both MPH/KPH and displays graphs as well (hover over points on graphs for exact values).

Hope it's useful

All the best ... Barry

[McJamweasel]