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Post by silverdragon on Apr 2, 2014 8:13:21 GMT
Its an age old discussion, as old as run-flats tyres themselves....
If you get a puncture on a bike, "You are a passenger", and "Pick a soft spot in the scenery", thats what is expected...
However, I KNOW that you can survive a tyre burst and end up upright with both feet on the ground at a standstill with minimal damage.
Experience, I have survived a front-wheel blow out tank-slapper at 45-50 mph, I cant give exact speed, as I had more interesting things to look at right then other than the speedo?...
So, CAN you survive a high-speed (But Legal?..) blow out on the front end.
And are Run-Flats a hindrance?...
My experience says yes, they probably would be, the harder side-walls would hinder cornering ability long before they became useful as a puncture survival tool.
Simple fact is you need the tyre side-walls to deform when you lean on them....?....
Or does anyone know better?....
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Post by the light works on Apr 2, 2014 15:01:28 GMT
motorcycle or bicycle?
I know for my personal preference on a motorcycle, I prefer the squish in my front end to come from the shocks rather than the sidewalls. on a bicycle - mine is so old it does not have shocks.
I know my long running dream as a lad was to have the new puncture proof tires - puncture proof as in there was no air to leak out of them. more because flats on bicycles are more commonly a nuisance than a hazard.
on a motorcycle, I would be inclined to feel a tire that could not suffer catastrophic failure would be a good thing - but a tire that could be flat without me knowing about it would be a bad thing - because the rating on a run flat tire is for how far it can go before it falls off the wheel; and one issue is that a person can have a flat without knowing it. (which is the reason for the proliferation of tire pressure monitoring devices)
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Post by silverdragon on Apr 3, 2014 6:46:29 GMT
I dont understand how a run-flat would work on a bike anyway.
As soon as you lean the bike over to go round a corner, that hardened side-wall is going to lean in the wrong direction....
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Post by the light works on Apr 3, 2014 6:53:02 GMT
I dont understand how a run-flat would work on a bike anyway. As soon as you lean the bike over to go round a corner, that hardened side-wall is going to lean in the wrong direction.... you mean when flat or when inflated? |
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Post by silverdragon on Apr 3, 2014 7:01:54 GMT
Erm... Kinda Both?....
Just how would a run flat work on a bike when flat?....
All that loose rubber from the tyre, just how would you get cornering grip when all that is flapping about?....
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Post by the light works on Apr 3, 2014 7:26:45 GMT
Erm... Kinda Both?.... Just how would a run flat work on a bike when flat?.... All that loose rubber from the tyre, just how would you get cornering grip when all that is flapping about?.... by having rigid enough belting that the rubber doesn't flap about. modern run-flats are essentially airless tires - that hold air. |
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Post by silverdragon on Apr 3, 2014 9:17:50 GMT
So why not just fit a tyre filled with high-density foam that replicates the normal characteristics of a normal tyre.
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Post by the light works on Apr 3, 2014 15:24:12 GMT
So why not just fit a tyre filled with high-density foam that replicates the normal characteristics of a normal tyre. That is what they do with airless bicycle tires. I think beyond that, the air still provides desirable characteristics as far as resilience is concerned. |
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Post by silverdragon on Apr 4, 2014 6:07:35 GMT
The airless bicycle tyres I have seen are hoops that you stretch over the rims, and are only rated to a certain speed, otherwise they stretch back over the rims themselves when heated up and span to a speed that gives enough centrifugal force.
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Post by the light works on Apr 4, 2014 14:56:48 GMT
The airless bicycle tyres I have seen are hoops that you stretch over the rims, and are only rated to a certain speed, otherwise they stretch back over the rims themselves when heated up and span to a speed that gives enough centrifugal force. at least for the older airless ones, here, it was a hoop that you inserted in a standard tire, like an inner tube. |
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