Has anyone used these on E Bike?
NEW AMERITYRE AIRLESS FLAT FREE BICYCLE TYRE 26 X 1.95PAIR MOUNTAIN TREAD | eBay
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NEW AMERITYRE AIRLESS FLAT FREE BICYCLE TYRE 26 X 1.95PAIR MOUNTAIN TREAD | eBay
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Tyres any good
- Thread starter gray198
- Start date
There have been a number of attempts to market these, but every review is critical.
The concept is fundamentally flawed, since a tyre has to have two different directional stabilities. They need to be vertically flexible but laterally very stable, this achieved in the carcase design but impossible to achieve with solid polyurethane. The end result is some discomfort through limited vertical give with too much lateral flexing making for less stable cornering than is desirable. I'd think ok for two wheel trailers though or possibly a slow riding utility cyclist.
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The concept is fundamentally flawed, since a tyre has to have two different directional stabilities. They need to be vertically flexible but laterally very stable, this achieved in the carcase design but impossible to achieve with solid polyurethane. The end result is some discomfort through limited vertical give with too much lateral flexing making for less stable cornering than is desirable. I'd think ok for two wheel trailers though or possibly a slow riding utility cyclist.
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Would the shortcomings or drawbacks with this type of tyre be noticeable on the rear wheel?
There is the obvious advantage of never suffering a puncture on a bike with a difficult to remove rear wheel/motor/gear set-up and I can't imagine anyone riding that type of electric bike noticing any great change in handling characteristics. I, of course, have no idea since I have never ridden on airless tyres....well, not since I was about six; my trike had solid tyres.
Flecc's point about slow-riding utility cyclists probably covers most readers of these pages!
Indalo
There is the obvious advantage of never suffering a puncture on a bike with a difficult to remove rear wheel/motor/gear set-up and I can't imagine anyone riding that type of electric bike noticing any great change in handling characteristics. I, of course, have no idea since I have never ridden on airless tyres....well, not since I was about six; my trike had solid tyres.
Flecc's point about slow-riding utility cyclists probably covers most readers of these pages!
Indalo
C
Cyclezee
Guest
This review from 2005 says enough to put me off http://hex.meiring.org.uk/pdm/Audax/articles/Amerityre.html
I also note from the second photo on the eBay ad that they are for steel rims?
I also note from the second photo on the eBay ad that they are for steel rims?
Probably because of the amount force required to get the tyre on the rim. I bet it is a right wrestling match to get the tyre fitted.
Exactly right. When Peter Eland of VeloVision reviewed a pair of these they were fitted by the supplier who, to Peter's alarm used two huge screwdrivers as tyre levers to force them onto the rim. Very risky with alloy rims.Probably because of the amount force required to get the tyre on the rim. I bet it is a right wrestling match to get the tyre fitted.
The lateral stability matters even on the rear wheel only, it can be disconcerting for the bike's rear end to creep out onto a different line around a bend.
Curious to know a little more about airless tyres and and their application on bicycle rims, I researched the web. Many attempts have been made over the years but each one seems inferior to the pneumatic tyres we know so well.
Problems I hadn't reckoned on include tyres "skating" inside the rim under braking and increased rolling resistance. Spoke loosening is also mentioned which is a tad worrying if true. All in all, having to mend the odd puncture of a modern, Schwalbe-type, puncture-resistant tyre doesn't seem too onerous after all!
Indalo
Problems I hadn't reckoned on include tyres "skating" inside the rim under braking and increased rolling resistance. Spoke loosening is also mentioned which is a tad worrying if true. All in all, having to mend the odd puncture of a modern, Schwalbe-type, puncture-resistant tyre doesn't seem too onerous after all!
Indalo
There have been various types of completely "puncture proof" tyres over the years, the solid polyurethane one being the most recent and least satisfactory in many respects.
The only one that has enjoyed widespread acceptance, first by the military and later for certain civil applications had been the "run-flat", These are seemingly normal tyres using air inside but which are able to support the vehicle fairly safely when holed. Basically they consist of a very thick and quite rigid carcase construction which of course does very little for comfort. Repair is usually by replacement and their life is quite short due to the development of high temperatures in the thick carcase under normal running conditions.
A remaining proposed one from very long ago consisted of a spiral of spring steel wire around the whole of the inside of the tyre, but to give the two differing compliances, at each sidewall point of the wire spiral it had a smaller loop in the wire facing inwards. This increases the vertical compliance without too severely affecting the lateral, though overall stability still did not look good.
Of course in every case these solutions have the considerable disadvantage of not having a variable resistance to differing loads, as in more or less tyre pressure.
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The only one that has enjoyed widespread acceptance, first by the military and later for certain civil applications had been the "run-flat", These are seemingly normal tyres using air inside but which are able to support the vehicle fairly safely when holed. Basically they consist of a very thick and quite rigid carcase construction which of course does very little for comfort. Repair is usually by replacement and their life is quite short due to the development of high temperatures in the thick carcase under normal running conditions.
A remaining proposed one from very long ago consisted of a spiral of spring steel wire around the whole of the inside of the tyre, but to give the two differing compliances, at each sidewall point of the wire spiral it had a smaller loop in the wire facing inwards. This increases the vertical compliance without too severely affecting the lateral, though overall stability still did not look good.
Of course in every case these solutions have the considerable disadvantage of not having a variable resistance to differing loads, as in more or less tyre pressure.
.
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