I've wheelied over a tree branch in the road, better to run over it with the back tire than the front.

 

no comment on the "simple physics" Everyone who knows how to ride a motorcycle knows the answer to that one...

 

you guys think i'm f***ing with you? They came up with those numbers (70% front brake, 30% rear) by testing on cruisers. On a cruiser you can't brake hard enough to transfer all of the weight to the front; so obviously the rear brake is going to help. Sportbikes are different. If 30% of your braking comes for the rear brake (asuming you're riding a sportbike), you aren't slowing down as fast as possible.

 

 

overall....its best to brake with both wheels on the ground. Turning a bike with both wheels is alot easier than turning an endo. So as for accident avoidence, two wheels will probly stop you faster, and be safer....but if you want to look gangsta while avoiding an accident, pop that back wheel up high and see if it works for you.

 

I'm with f4rider on this one...

Did a search, and found the 70% ~ 30% thing, on ridelikeapro.com
This must apply to non-sportsbikes, as locking up the front was mentioned as a thing that could happen in such a braking situation. Most sportsbikes with sticky warm tires on a good road, will not be able to lock up the front with proper braking.

Nomatter what brake you apply more pressure to, the weight will move towards the front. I'd say once all 100% of the bikes weight is on the front wheel, you'r in a max braking position, but only if both wheels are on the ground.
As soon as the rear starts to lift, one has to let off some brake pressure, to avoid flipping the bike, as the centre of gravity is moved up and forward.
Just look at racers, those guy's want to slow down as fast as possible. They always keep both wheels on the ground, but sometimes there's so little weight on the rear that it is waving back and forth.

I'm not sure that I am right, and I'd like it if someone would explain how 70% ~ 30% stops you faster than 99,9% on the front does.

I also found this site:

http://www.mecc.unipd.it/~cos/DINAMO...ng_new.htm#A99

Very scientific, but amongst other thing's it has this graph:



Quite hard to figure out, site explains it... See how the max braking force is reached with front brake only

 

Get your calculator and figure this in to the equation, Braking in its final form is being performed by the tire creating friction against the road that being said the more rubber you have on the road, the more braking can be performed. With your rear tire on the ground the more friction surface there is regardless of how much weight is on it. Maybe 70/30 is'nt the right ratio for a sport bike but you can still stop faster with both tires on the ground and braking.

 

i think what someone said is they lost the rear end of their bike, and because they do power slides (stunting) they knew how to control it....

stunting has saved my life a lot of times, i'm more aware of what is around me because i'm always looking for other riders and cars that will tear me down. i guess because i do wheelies i watch more cars, therefore i'm used to looking ahead in the road and seeing possible escape paths for an accident.

 

i did a wheelie running from a cop once so he couldn't see my license plate. Now thats life saving stunt skills

 

damn straight!

 

Braking is performed by friction, but almost all of it is between the brake pads and roters (unless your tire is sliding). And more area doesn't mean more friction.

Damn, even if what i say is right, I get flamed on because I'm a 19 year old squid. If Darius or Joe or Dan would have said that stuff, nobody would have said jack.

 

once again you stop 5' quicker then you do if you use the back brake

 

consider floating a piece of plastic on water..

the larger surface area, the easier it 'floats' if it's a little plastic BB, it will sink, if it's a large sheet of plastic it will float.. alot of that has to do with surface tension, but the larger surface area is my point with that..

consider the same with motorcycle, if 100% of the bike's weight is on the front tire, will it break loose easier at at a faster stopping rate then if there is two wheels on the ground, and a larger surface area to distribute the stopping power evenly ?

yes, there IS alot of friction at the pad area, but where does that friction alcually END up ?? at the contact between the tires and road, why do race tires 'ball up' or melt ? because there is ALOT of friction between the two, thats where the last point of friciton is.. the friction from pads slows down the wheel, and in turn from the tire to the ground slows down the bike... so yes there is ALOT of friction from the tire to the ground, thats why they can break loose..

is what that math site said about braking power..

basically, they stated that, if using ONLY front brake, you can get .64G stopping power, if using JUST rear, you can get .29G, but using both together you can theoretically get .8G of stopping power with a 90% front brake, 10% rear brake ratio... so sorry if I was off with my 70/30 I'm neither a mathmatician or phsyicist..

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I hardly believe 'powersliding' is considered stunting, moreso somethign that I praticed for emergency situations.. i'm sure most MSF cources pratice powersliding and hardly consider it a 'lifesaving stunt'...

as well as saying that because you do wheelies, you are more aware of the road.. how can you say that doing wheelies makes you more aware of the road ? I think I am more aware of the road because I don't want my *** to get runover, not because I do wheelies.. wheelies are something I do in a secluded spot, not inbetween traffic going to work..

always have an escape route for every position you put myself in while riding on the street, and that is the first thing you should learn when riding on the roads, not something that comes with stunting or doing wheelies..

 

EVERYone has a valid point. But if you don't attemp to roll an endo it dosen't come up that high ( maybe 2 or 21/2 ft ). Enough to slow you down fairly quickly. And power sliding is in the parking lot going to park and that bitch thinks that she is going to get to that parking spot before the bike does. that is enough to pull in the clutch, brake(slide), turn, and raise middle finger as bike stops. I think that being envoled in stunting it gives you that extra awareness that you normally wouldn't have if you didn't.

 

Almost got it, but no. All the brake pads do create friction on the rotors to slow the wheel, the wheel in turn has a tire on it which contacts the road. This is where your missing the point the tire creates friction against the road. Just try it for yourself, go put an old battlax front thats been sitting outside for years on the front of you bike and see how well it stops.

 

i'm done arguing with dumbasses

 

.

 

i'm done with ignorants

just go ask your high school's physics teacher and see what he has to say..

my post had supporting facts, opinions and examples, I don't know what else can prove it to you..

just because you can do a few wheelies and a few endo's does not mean you know everything about riding motorcycles.. some people have been riding since before you even knew what a motorcycle was.. I think people like Keith Code and other motorcycle instructors know just a LITTLE more then you and me, and I'll definatley take their word for it over yours..

i'm out....

 

Holy sh i t! This thread is great!

 

ok so sorry but it IS faster to slow down on 2 wheels than one. The almount of friction is increased by surface area, stopping is created by the friction of the tire to the road. the brakes on the rotors slow the movement of the wheel but untamently its the tire that is what is stopping you. you will NEVER slow down faster on 1 wheel than two. yes there is a point where you will be having less pressure on the back tire but not NO pressure unless ur backtire is on the ground and then you are having no friction from the back and its not helping you slow down. the 70 thirty thing is different for sportbikes but its not 100% front tire.