WTF just happened at that light?!

[tdragger]

Car tires don't stick better, pretty well proven at this point.

says who?

 

[Mittzy]

Add some more HP to the equation and you can do all that spinning stuff with your front wheel in the air...
If I take off as you did I would probably disappear in tyre smoke and lose direction - it seems I gotta be rolling before I stick it hard....

 

[Claviger]

says who?

Bob Carpenter when they set the land speed record with their rocket 3, they tried a car tire and it just ended up spinning more than the bike tire so they went back to the bike tire.

Hard car tire vs soft bike tire = loses every time for grip/traction.

Width of tire does not determine grip. Width only determines longevity.

A quote from a physics forum:

Mehcanisms of Tire grip. Friction Mechanical Keying Adhesion As they are madr from deformable rubber, tires dont exactly follow basic friction theory. So to just say that F=mu*r is strictly wrong. Although it basically does floow this during the elastic range. Tires only give grip when they are at the correct temperature. this is the most important thing you can remember about tires . Now on to business. Tires are the most important part of the suspension, either they are designed to fit it, or the suspension is designed around the tire. People who say wider tires make more grip because ;''there is more rubber on the road' are wrong. They are both wrong that it makes mroe grip and that there is more rubber on the road. When you make a tire wider, you alter the contact patch to be wider , but it reduces in length.

So depending on sidewall stiffness, a wider tire can actually give less rubber on the road. The main reason for tires being the size they are is actually heat management. Wider, low sidewall tires will cool better than narrow tall tires. If you can;'t get a tire up to temperatie it will give no grip, if you get it too high you will cook the rubber and ruin the set of tires. Back to contact patch, you can safely assume that contact patch stays roughly the same area with wide or narrow tires (as long as the load stsys the same). Narroe will have longer contact patches and wide tires will have shorter. The reason why F1 tires are wide is primarily so that they dont cook (remember they arent just wide, they are fairly high sidewalled), but they ten dto have wider contact patches because they will give better grip going round corners. A wide tire will generate more lateral force per slip angle making cornering better. F1 cars DO NOT have wide tires for linear acceleration.

Conversely (Mike im goin to have to disagree with you here) drag racers acutally use the tires not becuase of the width, but the tallness. As we know a wider contact patch gives better cornering performance, a narrow but long contact patch is what you want for linear acceleration. so strangely, drag racers will actually be better with narrow tires. So why do they use wide tires? (remember the most important gip aspect of tires) Temperature! They want as longer contact patch as they can get, but need the width for cooling. (eith 4000+ horsepower you do kind of build temp rather well) But if you look at the contact patch shape between say, an F1 car or drag racer. (both are considered to use wide tires). The F1 patch will be wider and shorter for good cornering, the drag patch will be longer and narrower (relatively) for good linear acceleration. So to sum up: Wider tires are not always better. They dont always give better traction. It depends on the car, the situation, the conditions. Eg.

Rally cars use wider tires when on tarmac rallys, and use (surprisingly) very thin tires on ice rallys. F1 cars used to use narrow tires until aero began to be used in the 60's. Drag racers acutally want tall tires, width is there to stop the tire being destroyed. TEMPERATURE!!!!!! rawr. As example I can think of is formula student cars, they used to use 8inch tires but couldnt get them up to temperature. They switched to 6.5inch and got more grip because they can get them up to temp. hoyl beep thats the longest post i've ever done. I should do a tl;dr summary.

Reference Wider tire giving better traction debate!

More on it here:Friction - Wikipedia, the free encyclopedia width is not a factor in friction generation that increases or decreases friction, it only increases or decreases pressure, less pressure less heat, less heat less wear. All that goes out the window with the abnormal contact patch of a car tire on a bike.


Add to that misaligned bead of a car tire in a rocket rim, the liability, enjoying dragging pegs frequently, and the ability to afford bike tires there is literally NO reason to run a car tire.

 

[Jeff Cameron]

Seems like the Rocket was short shifted into 3rd gear in that video.....

 

[LOFTYBOB]

This beast needed a car tyre, went round corners pretty good as well



Never lost a drag on the street.

 

[LOFTYBOB]

Car tires don't stick better, pretty well proven at this point.

I disagree, and have over 100,000 Km's on car tyres to prove my claim

 

[Claviger]

Meh, not going to try and explain to people with hands over their ears why car tires on bikes are stupid, unless going for longevity of your tire, any more.

Ride it like you stole it whatever it is.

Curious what your ran in the quarter on that, must be in the 7s.

 

[LOFTYBOB]

Meh, not going to try and explain to people with hands over their ears why car tires on bikes are stupid, unless going for longevity of your tire, any more.

Ride it like you stole it whatever it is.

Curious what your ran in the quarter on that, must be in the 7s.

Wheelstanding when hitting the 100HP shot of NOS was the biggest problem, would normaly short shift 2nd to 3rd before hitting the giggle gas with a best time of 8.83 seconds for a 1/4 mile pass. Without a professional license from ANDRA, that was my first and only run on a track.

 

[sleeves]

Hi Claviger

I had a similar amusing incident with some low slung lotus sports car while I was on holiday had my saddle bags, pack and tent on the back. Pulled up at an overtaking lane that lead out of some roadworks, this thing suddenly winds itself on with two guys laughing at me, I added some R3 torque and HP and watched them disappear. Sadly here's me 2 minutes later

Did it teach me anything?, brake faster when the radar goes off...

Live and don't learn.

 

[Mittzy]

Hi Claviger

I had a similar amusing incident with some low slung lotus sports car while I was on holiday had my saddle bags, pack and tent on the back. Pulled up at an overtaking lane that lead out of some roadworks, this thing suddenly winds itself on with two guys laughing at me, I added some R3 torque and HP and watched them disappear. Sadly here's me 2 minutes later

Did it teach me anything?, brake faster when the radar goes off...

Live and don't learn.

Bugger!!!!!!