Braking Distances
Paul Cassel
any road tests of bikes that include the standard braking distance stat that
almost every car mag does. Is the braking distance from say, 70 to 0 tested
by any rag or other reliable source? TIA.
-paul
Dan Carter
I don't know of any. In fact, the only US magazines that publish
braking performance in every test are Motorcycle Consumer News and
Rider. Cycle World includes it sometimes, and Motorcyclist and Sport
Rider now omit it completely.
The 70-0 numbers from car magazines can be compared to the bike
magazine 60-0 by calculating average rate of deceleration. That goes
something like this:
average deceleration = speed^2 / distance * 30
Speed is in mph, distance in feet, and deceleration in "g", a fraction
of the acceleration due to gravity. Simplified for 60-0 and 70-0:
average deceleration from 60 = 120 / distance
average deceleration from 70 = 164 / distance
Here are some recent results from Car and Driver and Motorcycle
Consumer News:
Initial Stopping
Vehicle Tested Speed Distance Deceleration
------------ -------- ------- -------- ------------
Triumph MCN 2/99 60 106.7 1.12
Speed Triple
Corvette Z06 CD 2/01 70 152 1.08
Suzuki MCN 1/01 60 117.6 1.02
GSX-R600
Harley MCN 3/99 60 122.2 0.98
Road King
Honda Civic CD 11/00 70 186 0.88
Land Rover CD 12/00 70 211 0.78
Discovery
--
Dan Carter, San Luis Obispo, CA, Dat...@att.net
1983 CX650 Turbo | 1988 Hawk GT | 1990 VFR750R (RC30) | 1997 VFR750F
Tom Crooze
stop faster than a gixxer 600? noonononon that can't be right. fix it! put
some RUBBER tires on the gixxer!
Tom
"Dan Carter" <dat...@att.net> wrote in message
news:jj4h5t080kf4ai8in...@4ax.com...
Dan Carter
> aack! those can't be right! audi TT conv. and porche boxter S conv. will
> stop faster than a gixxer 600? noonononon that can't be right. fix it! put
> some RUBBER tires on the gixxer!
The Porsche stops from 70 in 168 ft (CD 1/00) or .98g, the Audi in 166
ft (CD 7/00) or .99g. According to those tests, the '01 Gixxer nips
them by a few hundredths.
If you're keen to be embarassed by an unlikely opponent, the Honda
Valkyrie stops significantly better than the Gixxer, from 60 in 107.4
ft (MCN, 7/96) or 1.12g.
As discussed here recently, a sportbike, with its relatively high,
forward center of mass and short wheelbase, is often stoppie-limited.
When the back end comes off the ground, additional braking force can
produce only disaster.
Teemu Korpijaakko
of an R1 and a Subaru Impreza 22B. I think it was a 1999 issue. I'm sure
somebody in this ng has it lying around!
If I remember correctly, the Subaru managed to out brake the R1! But then
again, the 22B isn't an ordinary car.
That should answer most of your car v. bike questions.
"Paul Cassel" <pcas...@home.com> wrote in message
news:oh_56.6271$ge4.3...@news2.rdc2.tx.home.com...
Dan Carter
My first answer was a bit muddled because I failed to read the
question carefully. No bike magazines I know of test 70-0. Cycle
World sometimes does 60-0. MCN and Rider always do 60-0. My previous
answer assumed you knew 60-0 bike numbers and wanted to compare to
70-0 car numbers. Sorry for the confusion.
Paul Cassel
account heat/fade/etc, but I think it must be close.
-paul
"Dan Carter" <dat...@att.net> wrote in message
news:jj4h5t080kf4ai8in...@4ax.com...
Paul Cassel
(the only bike I have figures for before Dan gave some) will stop in 106
feet from 60 mph. A typical auto will stop in 170 feet, an SUV in 220 from
70 mph. I doubt the autos or SUV's will get down to my GS levels if measured
from 60.
-paul
"Teemu Korpijaakko" <tko...@castle.net> wrote in message
news:93aemg$72m$1...@slb7.atl.mindspring.net...
Paul Cassel
figures. I wonder why all the mags don't publish this. It seems a heck of a
lot more interesting to ME than quarter mile times ridden by experts who
will burn a bike out in a few runs.
As a note, my R11GS stops in 106 feet according to MCN - one of the figures
I have on hand.
-paul
"Dan Carter" <dat...@att.net> wrote in message
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Erik Astrup
>If I remember correctly, the Subaru managed to out brake the R1! But then
>again, the 22B isn't an ordinary car.
>
>That should answer most of your car v. bike questions.
And lets not forget it's a hell of a lot harder to do *maximum* braking on a
bike than in a car.
---------------------------------------
Erik Astrup - Team Iguana Racing (Ret)
1995 Triumph Tiger
1999 Yamaha YZF-1000R1
"It's such a fine line between stupid and...And clever."
http://www.mother.com/~eastrup/
---------------------------------------
Tom Crooze
audi tt quattro convertible brakes 116 feet from 60 to 0 mph. the 2000
porche boxter s convertible brakes 117 feet from 60 to 0 mph. according to
you, dan, the 600 gixxer stops from 60-0 in 117.6 feet. so is that not
longer than the other two cars (marginally)?
maybe we're talking about different cars, and i know that you stated the
audi and porche's stats from 70-0. but the gixxer's stats were 60-0, that's
why i compared it that way.
stoppieing just enough so that the rear wheel rises an inch above the ground
is probably the maximum braking you can get. of course when you're at slow
speeds and you have to stop in absolute time, stoppieing until right before
the point of no return is probably the best thing to do. of course the
front wheel will go forward a bit if you let go of the front brake
prematurely.
and you know that if you're panic braking, you have to shift all your weight
as far rearward as possible in order to keep the back end from lifting up.
i do it on my bicycle all the time. scares the hell out of cagers when i do
that.
Tom
"Dan Carter" <dat...@att.net> wrote in message
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Dan Carter
> wait wait wait. according to motor trend, sept. 2000, page 126, the 2001
> audi tt quattro convertible brakes 116 feet from 60 to 0 mph. the 2000
> porche boxter s convertible brakes 117 feet from 60 to 0 mph. according to
> you, dan, the 600 gixxer stops from 60-0 in 117.6 feet. so is that not
> longer than the other two cars (marginally)?
I cited Car and Driver's result, 70-0 in 168 ft or .98g for the
Porsche, slightly worse than the Gixxer's 1.02g. Your Motor Trend
60-0 result differs only in the decimal digit reported by MCN for the
Gixxer. I'd guess it's all within the margin of error. And, as Erik
points out, getting maximum braking out of something like the
ABS-equipped Boxster is much easier than on a bike, especially on a
dodgy surface.
Paul Cassel
like my GS which also stops shorter than cars recorded at 60 mph. My GS
stops at about 1.15g at full tilt - MCN test.
Anyway, if you say which WILL stop faster, I'd say the sport cage like the
Porsche will due to skills needed. If you way which CAN stop faster, then I
think we got them especially when you figure in all those Excursions and so
forth in the mix.
-paul
"Erik Astrup" <eas...@mother.com> wrote in message
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Gary
"Teemu Korpijaakko" <tko...@castle.net> wrote in message
news:93aemg$72m$1...@slb7.atl.mindspring.net...
> If I remember correctly, the Subaru managed to out brake the R1! But then
> again, the 22B isn't an ordinary car.
Well, the R1 is no ordinary bike! I think this would be a pretty good
comparison.
> That should answer most of your car v. bike questions.
It kills me when these car Vs. bike arguments start at how many think the
bike is automatically going to be superior over the car. It's just not so.