Wide Tire Kits

[mwc]

Fat tire kits put food on my table for years. I worked at a shop that did a bunch of drag race and fat tire stuff, not really my thing but it can look pretty good sometimes. 240's on bigger bikes like the Busa and ZX14 kinda fit the look of those pigs. Much bigger and it starts looking goofy. We did a few 18x14's, an inch wider than a 360. Too much for me but to each their own. Not everyone wants to drag knee

Roaring Toyz are good people, Bob is a great guy. I'm sure he can set you up, but he's in FL.

 

[aram]

My friend did one on his tl1000r. I think the wheelbase was stock or close to it. Looks goofy and tires are expensive, but he seemed happy. Just order a kit, any competent shop should be able to install it.

 

[HeatXfer]

Maybe I'm just old and in the way, but I just don't see the reason for that. It does nothing to improve the bike in any way, it adds weight, changes the geometry, worsens the handling and braking, and costs thousands of $$$. Besides being a fashion statement, what good does it do? :shrug

It's all about "style" baby! You either gots it, or you don't.

 

[Cincinnatus]

Thank all the gods, I don't have that "style".

 

[flying_hun]

Okay, let's not go too hard on the new guy, please. Different strokes, and all that.

 

[russ69]

60 inch bikes are cool...at the drag strip. Slammed long wheelbase bikes are for the straightline crowd, no problem with that.

 

[Wicked4Racin]

Now I can understand why someone does this, I still don't get why a California based rider would run them. I get enough shit for riding a 6" stretched BUSA without a fat tire. Now when I go back to our house in NC they are all over myrtal beach like a case of spring break crabs. Check out myrtal west and a few other east coast companies. Your going to have to run a jack shaft so 2 chains, offset stuff, brake relocator, etc etc. if you want it to look "fly" then paint it like a red bull can and epwear wings! I unfortunately don't do wide tire kits in my shop because i don't like putting my name on something goofy

 

[FXCLM5]

you know what, i went on a poker run a few years back, met a dood that had the same 08 wht/silver gsxr 1000 that i had a few years back which i sold. So of course we get to talking since i used to have his same exact bike.

He was a cool guy, we chatted it up at all the other poker stops, hung out at the end of run eating food and I forgot how the conversation started but he just starts telling me of his super plans of stretching the gsxr and putting a custom wheel/tire in the back and lowering it etc......

the guy was white, maybe barfer?

he had some skillz on the gsxr, but it threw me off, cuz judging the book by the cover, that would not be the route of modification I was expecting him to go on for his gsxr

 

[Shaggy]

I would absolutely expect a ZX14 to stop in less distance than a ZX6 or ZX10, given a skilled rider.

I didn't do any research on the comparison, but I would also assume that a ZX14R is probably at least 130lbs heavier than a ZX6R. That has to account for something regarding increased stopping distance.

 

[Junkie]

I didn't do any research on the comparison, but I would also assume that a ZX14R is probably at least 130lbs heavier than a ZX6R. That has to account for something regarding increased stopping distance.

With traction not likely to be a limiting factor, for a single stop (meaning not overheating the brakes) extra weight shouldn't really influence stopping distance.

 

[Hazardous Waste]

It's all about "style" baby! You either gots it, or you don't.

YA----------- Thats what he's talkin bout

 

[Shaggy]

With traction not likely to be a limiting factor, for a single stop (meaning not overheating the brakes) extra weight shouldn't really influence stopping distance.

Science does not agree with that assertion.

Force = Mass * Acceleration
Acceleration = Force / Mass

Braking means mass is a negative number, but it still requires more force to decelerate a heavier object. Of course rotor size and caliper size/design also come into play, and I'm not sure how the ZX14 and ZX6 compare in those categories.

I'm sure we'll never find out either.....

 

[RickM]

Science does not agree with that assertion.

Force = Mass * Acceleration
Acceleration = Force / Mass

Braking means mass is a negative number, but it still requires more force to decelerate a heavier object. Of course rotor size and caliper size/design also come into play, and I'm not sure how the ZX14 and ZX6 compare in those categories.

I'm sure we'll never find out either.....

More mass equal more friction between tire abd ground. So if there's enough braking power available from the caliper/rotor it should equal out

 

[tfkrocks]

You're thinking of inertia. Objects that have more mass and/or speed are less inclined to change their state of motion, which is stopping in this case.

 

[Junkie]

Science does not agree with that assertion.

Force = Mass * Acceleration
Acceleration = Force / Mass

Braking means mass is a negative number, but it still requires more force to decelerate a heavier object. Of course rotor size and caliper size/design also come into play, and I'm not sure how the ZX14 and ZX6 compare in those categories.

I'm sure we'll never find out either.....

If both bikes have enough traction and braking power to lift the rear wheel (which I suspect they do), mass doesn't matter. Mass can never be negative - acceleration can be, but really the direction doesn't matter.

You can reasonably approximate it as a pseudo-static equation. With the back wheel just barely staying down, there's no force applied at the back tire.

We have an X force and a Y force at the front tire contact patch. Y force is equal to weight of bike + rider. X force is equal to deceleration force.

In order for the situation to stay static, deceleration force times height of CG = weight times horizontal distance from contact patch to CG.

So we end up with two equations (mass, gravity, CG known):

Deceleration = (horizontal force)/(mass)

(horizontal force) * (CG height) = (vertical force) * (CG distance back)

and of course vertical force = mass * gravity

We can change around EQ2 to (horizontal force) = (mass) * (gravity) * (CG distance back) / (CG height)

Now we substitute that into EQ1 and get

Deceleration = (mass) * (gravity) * (CG distance back) / (CG height) * (mass)

This simplifies to

Deceleration = (gravity) * (CG distance back) / (CG height)

Since gravity is fixed, Deceleration ~ CG distance back / CG height

A stretched, lowered bike will have a center of gravity farther back and lower, resulting in more deceleration. Mass isn't important.

Of course, this is all assuming the bike has enough traction and braking power to do a stoppie... but a ZX14 does. That's not to say that the braking feel is the same, but it ought to be able to stop in a shorter distance.

It's been a long time since I've taken dynamics, I'm used to statics... but I think I did this right.

 

[Shaggy]

I meant acceleration was negative, not mass. :derp

 

[HeatXfer]

I went to a negative mass once: All the priest talked about was how bad things happen to you when you sin. Very negative mass...

 

[day004]

Thanks for the math Sheldon...

 

[Sharky]

I imagine braking might be mildly improved. In most cases on modern sprotbiles, braking is limited by wheelbase (stoppies) rather than traction. Acceleration (at lower speeds) is too. By lengthening the wheelbase, and presumably lowering the bike, the bike should be less prone to stoppies, and potentially have a shorter stopping distance.

For bikes running soft tires, longer/lower means they'll stop faster. I would absolutely expect a ZX14 to stop in less distance than a ZX6 or ZX10, given a skilled rider.

That doesn't mean there aren't handling downsides, but there are legitimate advantages to a longer wheelbase.

A zx10 is like 100lbs less than a 14 (or more). Might want to figure that into you speculation.

 

[ilikefood]

A zx10 is like 100lbs less than a 14 (or more). Might want to figure that into you speculation.

That doesn't matter. Cruisers are much heavier than sport bikes and they have skinnier tires and shitty brakes, but they still stop just a well as sportbikes or better. Doesn't matter how little your bike weighs if braking causes it to stoppie. Sportbikes' stopping ability on dry, clean asphalt is limited by their geometry, not tire traction or weight.