Tyres on the wrong way for over two years

[Yellow Saddle]

What are the first two and who decided on the order?

It is too difficult to explain and besides, you have to be prepared for hours and hours of Euclidean maths. You are not up to it.

 

[winjim]

What other mechanisms do you propose? And to be clear, "road" is dry asphalt/cement.

Given that the road surface is not completely smooth, I would expect there to be some mechanical interlocking of the surfaces. Of course the effect of some of this will be merely to increase surface area and therefore increase the amount of VdW interactions, but I'm just suggesting that there are likely to be more complex effects than a simple smooth surface model would suggest.

 

[winjim]

It is too difficult to explain and besides, you have to be prepared for hours and hours of Euclidean maths. You are not up to it.

What's that quote about explaining things to your Grandma?

 

[ufkacbln]

Next week's hot topic:

Tea, does the milk go in the cup first or last?

And does it matter which way you stir?

The tradition was that Europeans were unable to make china of sufficient quality to accept boiling water .... so milk was placed in to stop the cup breaking

Never understood why they didn't just use cold water... unless there was Ye Olde Marketing of Milk Guild who through a chain of pamphleteers made milk the preferred choice

Stirring is simple - depends on hemisphere

 

[ufkacbln]

As a thought

Would the Coriolis effect mean that the OP's tyres would have been the right way round.... if they lived-in Australia?

 

[mjr]

The footprint of a road tyre is smaller than any part of a car tyre between the sipes. So even at car speeds it's unlikely to aquaplane.

Tread on a bike tyre becomes useful off-tarmac.

Including tarmac covered in shoot, as is common in most countries.

I'm pretty sure you're wrong about car tyre distance between sipes but my road bike has 32s on and I'm not going to put the calipers on my car tyres. The bike's not going fast enough anyway.

 

[smutchin]

You say you were at the Winchester Crit today, it's a shame I didn't know what you look like, I would have loved to come and speak to you, about tyres.

Shame it wasn't raining, you'd have been able to spot him easily - he'd have been the one aquaplaning about all over the shop on his slick tyres.

 

[Yellow Saddle]

What's that quote about explaining things to your Grandma?

If she doesn't have a PhD you may as well tell her to shut up and go play bingo. It is not worth wasting good mathematics on her. Pearls before the sow or something like that.

 

[Yellow Saddle]

Given that the road surface is not completely smooth, I would expect there to be some mechanical interlocking of the surfaces. Of course the effect of some of this will be merely to increase surface area and therefore increase the amount of VdW interactions, but I'm just suggesting that there are likely to be more complex effects than a simple smooth surface model would suggest.

None with static friction. However, once we have kinetic friction, then hysteresis plays a role too. Mechanical interlocking never plays a role unless the two surfaces are perfectly mated (like gears) and then we are relying on the shear strength of the softest material, not VdW. This is a digital thing. Either it meshes or it doesn't. There isn't a second-best interloper.

 

[winjim]

None with static friction. However, once we have kinetic friction, then hysteresis plays a role too. Mechanical interlocking never plays a role unless the two surfaces are perfectly mated (like gears) and then we are relying on the shear strength of the softest material, not VdW. This is a digital thing. Either it meshes or it doesn't. There isn't a second-best interloper.

Given that the tyre rubber is soft though, doesn't it deform in such a way as to provide that perfect mating?

 

[ufkacbln]

Given that the tyre rubber is soft though, doesn't it deform in such a way as to provide that perfect mating?

I thought for a minute that this is how you get Brompton tyres, but realised that with a soft rubber it could be a problem with that theory

Can you get viagra for tyres

 

[Yellow Saddle]

Given that the tyre rubber is soft though, doesn't it deform in such a way as to provide that perfect mating?

No. Imagine a perfectly soft (conforms to every nook and cranny) but perfectly frictionless material. Now imagine whether or not it will "hook and mesh" with road irregularities and resist them enough to create friction.

 

[Racing roadkill]

Given that the road surface is not completely smooth, I would expect there to be some mechanical interlocking of the surfaces. Of course the effect of some of this will be merely to increase surface area and therefore increase the amount of VdW interactions, but I'm just suggesting that there are likely to be more complex effects than a simple smooth surface model would suggest.

And you'd be right.

 

[Racing roadkill]

As a thought

Would the Coriolis effect mean that the OP's tyres would have been the right way round.... if they lived-in Australia?

Coriolis effect is a macro effect ( extremely large volumes of fluid are needed ) hence the stuff you sometimes hear about toilet flushes and sink draining being effected differently in either hemisphere aren't right.

 

[Racing roadkill]

Given that the tyre rubber is soft though, doesn't it deform in such a way as to provide that perfect mating?

you're nearly there. The mechanical effect is providing a mating, the chemical effect is what seals the deal.