Speed in Gears? - K-Bikes.com - Excellence in Motion
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post #1 of 15 (permalink) Old Jul 5th, 2006, 8:27 pm Thread Starter
 
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Speed in Gears?

Anyone know what the max mph is in each gear and at what rpm?
I have never seen it published.


thanks/ken
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post #2 of 15 (permalink) Old Jul 7th, 2006, 10:23 pm
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I have seen an indicated 180mph in 6th
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post #3 of 15 (permalink) Old Jul 8th, 2006, 12:35 am
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I'm Topping Out At 289 Kmh And On That Pass I Held It For 10 Sec Without Lifting
So I'm Stuck There At Only 289!!!!!
Has Anyone Made Passes With Filters And Pipe???

Stroker
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post #4 of 15 (permalink) Old Jul 8th, 2006, 1:01 am
 
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Quote:
Originally Posted by stroker
I'm Topping Out At 289 Kmh And On That Pass I Held It For 10 Sec Without Lifting
So I'm Stuck There At Only 289!!!!!
Has Anyone Made Passes With Filters And Pipe???
Probably the same. You'll just get there a little quicker.
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post #5 of 15 (permalink) Old Jul 8th, 2006, 1:06 am
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Quote:
Originally Posted by FaceThePower
I have seen an indicated 180mph in 6th
I seem to remember a top speed of a KS recorded on a salt pan at 178mph (286 kph). If you can get the rev limiter to top out in 6th and there is no wheel spin then the bike has to be at max. It won't matter if you have add on performance gear the top speed is determined by the rev limiter. Any extra power / torque just increases your rate of accelleration up to the rev limit.
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post #6 of 15 (permalink) Old Jul 8th, 2006, 8:36 pm
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Quote:
Originally Posted by Lenz
I seem to remember a top speed of a KS recorded on a salt pan at 178mph (286 kph). If you can get the rev limiter to top out in 6th and there is no wheel spin then the bike has to be at max. It won't matter if you have add on performance gear the top speed is determined by the rev limiter. Any extra power / torque just increases your rate of accelleration up to the rev limit.
Hence the part where I say "indicated" We all know speedo's are off on every bike and car for the most part. Just for reference...crusing at 140mph "indicated" my GPS unit showed 134mph actual.
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post #7 of 15 (permalink) Old Jul 9th, 2006, 5:29 am
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can be done with math....but have to know what your 6th gear ratio is and exact tire circumfrence is?...
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post #8 of 15 (permalink) Old Jul 17th, 2006, 3:27 pm
 
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Quote:
Originally Posted by RoadKing
Anyone know what the max mph is in each gear and at what rpm?
I have never seen it published.


thanks/ken
I banged the rev limiter in 4th and a quick glance down and WTF told me 140MPH. I quickly shifted to 5th and re-engaged. One other time I hit the rev limiter in 2nd at 90 MPH as I recall (it's been awhile since that happened). German autobahns were a great place to be!
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post #9 of 15 (permalink) Old Jul 17th, 2006, 7:36 pm
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Originally Posted by BAK04GT
can be done with math....but have to know what your 6th gear ratio is and exact tire circumfrence is?...
One difficulty with theoretical, non dynamic speed calculation is the distortion of the tyre cross section shape at high speed. The tyre walls stretch and the tyre diameter effectively increases the faster the wheel and tyre rotates. Next time you see drag racing with the pre run burnout have a look at the way the rear tyres expand in diameter as they spin up.

All this means that throughout the revs VS speed relationship there are progressive increases in gearing. This is not an application for a simplistic linear calculation of resultant speed. In fact the progressive increase in effective rolling radius with speed pushes into the world of calculus - advanced mathematics and non linear equations. Theory is just that - there is no substitute for a well run field test with a good GPS or split timer. Its a hell of a lot more fun too than pounding a calculator / computer.
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post #10 of 15 (permalink) Old Jul 18th, 2006, 1:42 am
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but with timing you have the "time space continum" to calculate......sure is a head scratcher isnt it
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