Can a motorbike out brake a car?

[Jantar]

Well it's not hard really i made morcs rvf400 with "wooden brakes" stop in a bike length from 60kph in a carpark after being on it 30 seconds.....

1 bike length = 2.3 m
60 kmh = 16.7 m/s
V^2 = 2*f*s
so f = 279/4.6
or f = 60 m/s/s ie 6 g.

That is 6 times what is physically possible, so stop talking crap SM.

[FJRider]

The key to good braking is reaction time(time taken to react), AFTER brain gets the message you do need to brake, and actually braking. At 100 km/hour about 28 meters is covered a second. Thats about 2.8 meters every 10ths of a second. So at a following distance of say 10 meters, and the vehicle in front STOPS(ie. hits something), you have about 2 and 1/2 tenths of a second before YOU are there. How goods YOUR reaction time ??? Are YOUR brakes up to it ???

[Jantar]

That's impressive.

I've never measured my stopping distances.

I recall Autocar magazine testing a few supercars for best 0-100 and 100-0 times (an R34 GTR won overall) and the stopping distances from 100kph were in the order of 30 metres.

The very stickiest bike tyres have been tested at just under 1G braking performance. That is equal to 38 m from 100 kmh.
So the data you give for supercars is in the right order. I have yet to see a bike decellerate at more than 1G unless there is some other outside inluence. Last year I stopped at 2.5G and I'm still waiting for the surgery as a result.

[FJRider]

It does help if YOU stop at the same speed as the BIKE.

[Jantar]

It does help if YOU stop at the same speed as the BIKE.

Geez, I hope not. The bike stopped at close to 5G. The previous rider who did that stopping performance on the same day was carted off by the flying doctor.

[FJRider]

But you weren't braking were you ???

[The Stranger:Me]

Even IF a bike can out brake a car, can you?
It really is a skill that requires a bit of practice to get right and particularly to make it a natural reaction in an emergency situation.

One tip, which will no doubt be contested, don't cover your brake with 2 fingers. All or nothing.

Why everyone is rattling on about ABS I am not sure. ABS on most cars and all motorcycles (with the exception of some BMWs) increases stopping distances. Sure it allows for control, which is nice if there is an out, but if the extra few metres you loose with ABS means life and death, it sucks big time.

[Katman]

What the fuck that is impossible. I think you will find its more like 8m at 30kmh.

Close. It's actually 7 metres from 30kph.

[MaxB]

Even IF a bike can out brake a car, can you?
It really is a skill that requires a bit of practice to get right and particularly to make it a natural reaction in an emergency situation.

One tip, which will no doubt be contested, don't cover your brake with 2 fingers. All or nothing.

Why everyone is rattling on about ABS I am not sure. ABS on most cars and all motorcycles (with the exception of some BMWs) increases stopping distances. Sure it allows for control, which is nice if there is an out, but if the extra few metres you loose with ABS means life and death, it sucks big time.

Quite right. ABS is designed to retain steering control of the vehicle and as a trade off stopping distance is slightly increased. That is the whole point. That you retain car control. It allows the driver to stand on the brake pedal without risk of locking up. A lot of drivers don not realise this and follow too close thinking they are safe.

ABS does not work so well for bikes because of the changing contact patch on cornering. Some systems get round this by detecting the lean angle and disabling themselves for a few seconds mid corner and rearming when upright.

[scracha]

This question comes up reasonably often; Jim2 has mentioned some test results indicating that bikes can, in fact, out-brake cars in the wet and the dry.

I'm fairly sure that actually doing so takes balls and skill, though. It's easy to stomp on the brake pedal in a car, particularly one with ABS, but hauling a bike to a quick controlled stop is a maneuver requiring care and precision.

Exactly. ALL bikes should have ABS if you ask moi.

[skidMark]

1 bike length = 2.3 m
60 kmh = 16.7 m/s
V^2 = 2*f*s
so f = 279/4.6
or f = 60 m/s/s ie 6 g.

That is 6 times what is physically possible, so stop talking crap SM.

What the feck are you on about.

want me to show you?

So what it's meant to take over 12 metres to stop from 60 kph?

Sorry is there no traffic where you are from?

And a 2.3 metre long bike? hang on, last i checked i didn't ride a chopper.

[jrandom]

What the feck are you on about.

You're not that dumb. You know about the gravitational acceleration constant, how '1G' is defined, right? That's about as good as bike tyres get in terms of accelerations they can keep sticking under.

Working out what acceleration a particular stopping distance equates to is straightforward, and the stopping distance you propose equates to six times the braking performance of bike tyres.

No, I don't think you can stop in a bike length from 60kph. That's pure bollocks. And Jantar was being generous with his 'bike length' - would you prefer your statement to sound even stupider if we lower that number?

...

Actually, come to think of it, I nominate you for the 'King of the Shyte Talkers' award.

want me to show you?

Who do you plan on borrowing a bike from to show him with?

[sAsLEX]

However a car with modern ABS can (again, not will) outbrake a bike without ABS. It all comes down to reaction time and driver/rider ability.

An F1 car can outbrake a bike without touching the brakes.

One tip, which will no doubt be contested, don't cover your brake with 2 fingers. All or nothing.

Why?

I only use two fingers for braking and that is plenty.

[koba]

Another factor to think about its a sportsbike (and others, I guess) needs to load up the front tyre to swing some weight on it before actually biting in to the real braking, perhaps this means that a car may initially outbrake a bike by alot but possibly be reeled in a bit afterwards depending on bike/car/rider/driver.
Just an idea.

[marioc]

http://www.youtube.com/watch?v=7Oz44oGaI4c
I thought bikes would outbrake cars but then I dont know much at all!
btw fifth gear? what a fuckin rip off of top gear.

Actually its not a rip-off at all and has been around just as long.
At least you get a female mmmm Vicki! and boy can she drive.
Better show than top gear anyday