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Old 24 April 2007, 17:55   #11
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Remember, the stresses on the tyre rise exponentially with speed so the increase from 60 to 70mph (17%) increases the stresses by 36%, at 80mph increased by 78%. If you have any defects they'll soon become apparent!
Interesting. Why is this?

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Old 24 April 2007, 17:56   #12
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where you are going, overtaking with the rib is going to be virtually impossible for much of it - so your speed is going to be determined by the truck or caravan in front anyway.
shows how much you know.... did the Forth Road Bridge to Inverness the easter bank holoday monday in 1 hour 39 mins ok ok so the rib was not on the back. but was just thinking that 50mph was way too easy. Neil I will keep a count of the caravans passed for you.

think the 55-65 sugestion should keep the boys in blue off the case and still let us make forward progress.
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Old 24 April 2007, 18:01   #13
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Key question - what condition are your trailer tyres in?
they are a year old and have done errrr 3 miles

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f near new they will probably be fine well above what you could expect to tow at (usually speed rated to 170km/h if I recall correctly)
ok will take the brave pills then

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However, if they are a few years old, been left exposed to sunlight suffering UV degradation, been run below recommended pressures and have a few cracks in the sidewall just for good measure, make sure you carry a spare!!
oh fear not have two spares. and have even dug out the jack.

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Remember, the stresses on the tyre rise exponentially with speed so the increase from 60 to 70mph (17%) increases the stresses by 36%, at 80mph increased by 78%. If you have any defects they'll soon become apparent!
ok but really was not thinking that 80mph would be big or clever so will leave this for some one else to test.
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Old 24 April 2007, 18:44   #14
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shows how much you know.... did the Forth Road Bridge to Inverness the easter bank holoday monday in 1 hour 39 mins ok ok so the rib was not on the back. but was just thinking that 50mph was way too easy. Neil I will keep a count of the caravans passed for you.

think the 55-65 sugestion should keep the boys in blue off the case and still let us make forward progress.
you must have been averaging 90mph - hope you managed to spot the unmarked cars

maybe you would get more sponsorship - for no of caravans passed on the A9
whilst towing the rib...
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Old 24 April 2007, 19:22   #15
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he was asking 'fuzz avoidance' questions yesterday and how to come by the scottish polis college stickers for the back of his car....

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you must have been averaging 90mph - hope you managed to spot the unmarked cars

maybe you would get more sponsorship - for no of caravans passed on the A9
whilst towing the rib...
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Old 24 April 2007, 19:29   #16
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he was asking 'fuzz avoidance' questions yesterday and how to come by the scottish polis college stickers for the back of his car....
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Old 25 April 2007, 02:55   #17
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you must have been averaging 90mph - hope you managed to spot the unmarked cars
Going by the trip computer 82mph average just for the record. and yep it was a bit like a Hollywood actress........... 100% fuzz free.
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Old 25 April 2007, 05:24   #18
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55-65 In lane 1 with lorries for company, usually a better standard of driving than in lanes 2 & 3.

We've got an all new axle at moment with some very good tyres, the whole caboodle tow very well and is stable.

I'd heard the "stress" argument before and but never saw any science behind the figures, it wouldn't surprise me if load rose like this on the bearings. Clearly the kinetic energy will be vastly higher.
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Old 25 April 2007, 09:34   #19
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Tyres are obviously subjected to more stress the faster you go. For a start you have heat build up which can be substantial. Then you have centrifugal force that is always trying to destroy the tyre along with external frcition of the road and internal friction of the carcass.

I have seen tread blocks peel away from tyre as they have become too hot and gone too fast. A blowout is only seconds away - ask Richard Hammond!!!
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Old 25 April 2007, 13:22   #20
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Please remember that this is one of those situations when "bigger is better" as there is a squared relationship between dia. and forces and peripheral speed and therefore heat, wear and forces. Small wheels are bad, big wheels are good.
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