Talk:Run-flat tire

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Changing Tire and Tyre[edit]

The original author -- SteveBaker -- wrote this article on 28 December 2005 as follows: "A pneumatic vehicle tire that is ..." Therefore, the original spelling is tire and the article title should not be changed to "tyre" Thank you, CZmarlin 14:09, 5 June 2007 (UTC)[reply]

Agree very much, even though I'm British - leave UK and US spellings as the original author wants them. If you suspect a genuine mistake - look it up before changing anything!78.54.178.38 (talk) 16:17, 27 April 2009 (UTC)[reply]

Photo(s) needed[edit]

We need a photo or two for this article! Anybody have any? --24.21.149.124 (talk) 04:01, 31 December 2008 (UTC)[reply]

AFV Use[edit]

UK armoured cars have had run-flat tyres since the late 1930s. On later vehicles there is a second ring of 'wheel nuts' usually painted bright red. These secure the rim to the wheel-proper and must not be undone without caution and the proper tools as IIRC, the rim is under great tension and can be dangerous. The post-war Ferret had these wheels as can be seen on the picture at right. —Preceding unsigned comment added by 213.40.251.230 (talk) 20:25, 10 November 2009 (UTC)[reply]

Although run flats have indeed been used in the UK (the Dingo was the first to use solids) and these wheels have red-painted nuts, the red-painted nuts are merely there to indicate a two-part wheel with either type of tyre. Many UK mil trucks have (and need) red nuts on their wheels. A two-part wheel rim allows tyres to be changed more easily without tools, provided that all tyre pressure is released before starting to undo the red-painted ones. Andy Dingley (talk) 00:42, 6 April 2014 (UTC)[reply]

=More criticism[edit]

- not every car service (especially in small towns) can handle this technology. - lack of season tires (winter/summer) - less energy efficiency then standard tires - harder than standard tires —Preceding unsigned comment added by 83.230.121.1 (talk) 09:29, 17 November 2009 (UTC)[reply]

There absolutely are both summer and winter tires available in run-flat. In fact, there are fewer all-season run-flats. Examples of summer run-flats are Dunlop SP DSST and Michelin Pilot Sport ZP. Examples of winter run-flat: Dunlop Winter Sport M3 RunOnFlat. Run-flats were developed for high-performance automobiles whose manufacturers want to save weight by not having spares, e.g., Corvette and BMW. The drivers of such cars want seasonal tires, so most run-flats are either summer or winter. The Michelin Pilot Sport A/S Plus ZP is one of a handful of all-season run-flats. —Preceding unsigned comment added by 72.196.192.162 (talk) 03:59, 26 December 2009 (UTC)[reply]

BMW 5-series has run-flats and spare tire[edit]

BMW 5-series cars in the US can have both run-flats and a spare tire/jack. My 535 with xDrive (2010 model year) came with run-flats, a spare, and a jack with tools. I agree it's overkill, but it is available as such from the factory. —Preceding unsigned comment added by 72.196.192.162 (talk) 20:09, 24 December 2009 (UTC)[reply]

Grumman Aerospace work on run flat tires in the late 70's and 80's[edit]

Grumman Aerospace (now Northrop Grumman) had a number of patents relating to run flat tire technology starting in the late 1970's. Other than patent documents, however, the only reference I can find about their work is from page 12 of a company newsletter^[1]. Is it worth adding a reference in this article? Does anyone know of any other pertinent sources? — Preceding unsigned comment added by Secondwire (talk • contribs) 17:43, 20 August 2020 (UTC)[reply]

References

^ https://www.grummanretireeclub.org/wp-content/themes/grumman-child/archive-newsletters/grumman-world-1982-11-03-Volume-1-Number-3-Fall.pdf

I've added a difference between the regular and run-flat tires and asked for permission by email. — Preceding unsigned comment added by Gurkanemrecan (talk • contribs)

[1] ttps://www.grummanretireeclub.org/wp-content/themes/grumman-child/archive-newsletters/grumman-world-1982-11-03-Volume-1-Number-3-Fall.pdf

[1]