25mm tyres

oh?

you try running 19 mm tires at 120 psi.

I've tried 20mm tubs at high pressures and was faster on wider lower pressures. I felt much faster on the rock hard skinny ones though.

now you're really sounding like an idiot. thanks for the "i tried and i felt" proof. I'm out of this.

elaborate.

You talk of bullshit in this thread and then make a statement that "Gatorskins are indestructible"
Thought I would just point that out as wouldn't want to add to all the bullshit.

now you're really sounding like an idiot. thanks for the "i tried and i felt" proof. I'm out of this.

I posted a link earlier which gave an explanation. You then suggested I tried something that I already have.

I'm not sure why you are being hostile.

oh?

you try running 19 mm tires at 120 psi.

I have. (A few years back). The ride's crap and the handling's shit. And they're not that fast, unless you happen to have aero section wheels.

In the past year, I've used and abused a range of tyres. The fastest, without a doubt, are my 25mm Pro Race 3, running at 85/90psi. Hands down the fastest tyre I've used, and it's noticeable. I'm also currently using 23mm Open Corsa IIs 110/115psi, which serves as a good comparison, because it's widely recognised to be one of the fastest 23mm tyres out there. (Corsas for the dry, PR3 for the wet, though the PR3s are now on full-time). And it's not as fast as the PR3. Same wheels, same bike.

now you're really sounding like an idiot. thanks for the "i tried and i felt" proof. I'm out of this.

There was a more scientific explanation posted in link earlier in thread

http://www.schwalbetires.com/tech_in...ing_resistance

now you're really sounding like an idiot. thanks for the "i tried and i felt" proof. I'm out of this.

You, of course, backed your comments up with solid science.

Oh.

the width of the tyre IS NOT going to affect your likelyhood of punctures to a great extent. Ultra races have shit puncture protection so just get something better and pump it up to just below the max pressure. 2mm difference in width is not going to make a serious difference, just buy a better tyre! (gatorskin/ribmo/shwalbe etc)
Every experience i have had with those tyres has been bad!

From Grant Petersen:

The biggest, best bargain in bicycles is air in the tires, yet for the last twenty years or so there's been a heinous trend toward tires with lower and lower volumes. This is bad because these skinny tires need to be pumped up to outrageous pressures like 110 to 145 psi just to protect the tubes from pinch flats and the rims from flat spots. Such high pressure tires roll fast on smooth roads, but as soon as the road turns slightly rough or slightly wet, they're uncomfortable and slippery.
The whole idea of hard skinnies is speed, but it doesn't work that way. Speed comes from fitness, not hard & skinny tires.
It's better to ride on higher volume tires that can be ridden at lower, more comfortable, and grippier pressures.
Bigger softer tires are often faster than hard skinnies, anyway. When a hard tire hits a bump in the road, two things happen. First, the bike is jolted upward, slowing its forward progress. Second, you-the-rider are jostled at least to the point of having to recover from the feel of the bump, and maybe even to the point where you lose control. Certainly, if you hit a bump as you're cornering at high speed, the wheel will likely lose the ground, and you'll go down.
With a softer tire it's a different story. Instead of the bike and wheel getting bounced, the larger, softer tire deforms and it smacks the bump (or edge of the pothole), and the tire rolls right over it, continuing its forward motion nearly unimpeded. Around the corner, you maintain traction. You can relax more because, as you ride in and out of the shadows on an unfamiliar road, or at night, you know your tires are there as a buffer for you.

the width of the tyre IS NOT going to affect your likelyhood of punctures to a great extent. Ultra races have shit puncture protection so just get something better and pump it up to just below the max pressure.

My goodness, have you not read the thread :-)

Width matters because it allows you to lower your pressure. Lower pressure matters because it reduces the chance of puntures. Do not pump up to the max, it's ridiculous, and ride quality and handling suffer massively too!

There was a more scientific explanation posted in link earlier in thread

http://www.schwalbetires.com/tech_in...ing_resistance

tell me you're kidding..

directly off your page:

Why do Pros ride narrow tires if wide tires roll better?
Wide tires only roll better at the same inflation pressure, but narrow tires can be inflated to higher pressures than wide tires.

yes there is a lot of bollocks on this thread ^^

yes ive read it, but i also have experienced opinion of my own tool

do you really think a tyre at lower pressure has less chance of punctures? do you ride a bike or drive a f##king tractor?

did you read what i said? I said in theory, not in practice.

From Sheldon:

Rolling resistance does decrease theoretically with any increase in pressure, but with modern, high-quality tires the rolling resistance at correct inflation pressure is already so low that the infinitesimal reductions gained are more than outweighed by the trade-offs.

From Grant Petersen:

The biggest, best bargain in bicycles is air in the tires, yet for the last twenty years or so there's been a heinous trend toward tires with lower and lower volumes. This is bad because these skinny tires need to be pumped up to outrageous pressures like 110 to 145 psi just to protect the tubes from pinch flats and the rims from flat spots. Such high pressure tires roll fast on smooth roads, but as soon as the road turns slightly rough or slightly wet, they're uncomfortable and slippery.
The whole idea of hard skinnies is speed, but it doesn't work that way. Speed comes from fitness, not hard & skinny tires.
It's better to ride on higher volume tires that can be ridden at lower, more comfortable, and grippier pressures.
Bigger softer tires are often faster than hard skinnies, anyway. When a hard tire hits a bump in the road, two things happen. First, the bike is jolted upward, slowing its forward progress. Second, you-the-rider are jostled at least to the point of having to recover from the feel of the bump, and maybe even to the point where you lose control. Certainly, if you hit a bump as you're cornering at high speed, the wheel will likely lose the ground, and you'll go down.
With a softer tire it's a different story. Instead of the bike and wheel getting bounced, the larger, softer tire deforms and it smacks the bump (or edge of the pothole), and the tire rolls right over it, continuing its forward motion nearly unimpeded. Around the corner, you maintain traction. You can relax more because, as you ride in and out of the shadows on an unfamiliar road, or at night, you know your tires are there as a buffer for you.

I think this is the perfect answer. depends on your roads.

Honestly i never thought about that. I was only thinking in an ideal sense, and now about road type.

overall the past 9 posts have brought out some usable information.

do you really think a tyre at lower pressure has less chance of punctures? do you ride a bike or drive a f##king tractor?

Yes, absolutely and without a doubt!* And I ride a load. And I use tyres, at appropriate pressures, that people dismiss for being puncture prone (e.g. open corsas). And I don't tend to puncture much.

• The caveat is that you have to have enough pressure to avoid pinch flats. Pinch flats are caused by too low pressure. But casing punctures are made worse by higher pressure. There is a trade off and a sweet spot. Also with ride and handling.
  

I think this is the perfect answer. depends on your roads.

Honestly i never thought about that. I was only thinking in an ideal sense, and now about road type.

overall the past 9 posts have brought out some usable information.

Apology accepted.

Group hug?

;-) nice ant. I get a bit tossy sometimes on the internet. not that bad in person.

the theory behind the PSI thing is that a lower pressure will allow a sharp object to deform the tire, rather than puncture it. I don't know what happens in practice. this is as i understand it.

I'm much nicer on the internet than in real life :)

The narrowest tyre I will run now is a 23 and that's on my TT bike and race bike. My general ride about bike has 32s on it.

http://www.sheldonbrown.com/tires.html#pressure
http://www.sheldonbrown.com/tires.html#rolling
http://www.sheldonbrown.com/brandt/rolling-resistance.html

I did not double click the fucking post button stupid double submit motherfucker.

do you really think a tyre at lower pressure has less chance of punctures? do you ride a bike or drive a f##king tractor?

I do actually. Within reason.

the theory behind the PSI thing is that a lower pressure will allow a sharp object to deform the tire, rather than puncture it.

Exactly. It's not the best example, but compare 2 similar balloons, one with low pressure, the other one really inflated. I can garantee the latter will be easier to burst.

Anyway, any thread about tyres is doomed. I wish you all a safe and puncture-free ride.

Lower pressure.. more chance of a pinch flat, less chance of a penetration puncture.