Dunlop Direzza
Posted: Sun Feb 17, 2013 6:21 am[url]http://www.tirerack.com/tires/tires.jsp?tireMake=Dunlop&tireModel=Direzza+ZII&partnum=86HR4Z2&vehicleSearch=false&fromCompare1=yes/url]
anyone running these
anyone running these
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Dunlop Direzza
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Posted: Sun Feb 17, 2013 6:21 amRe: Dunlop Direzza
Posted: Sun Feb 17, 2013 7:12 pmOne low profile size in 14" and the rest in 15"-18"? Nope!
Re: Dunlop Direzza
Posted: Sun Feb 17, 2013 9:19 pm185/60-14 is the common tyre size for those who upgrade to 14" Minilites. Its rolling diameter (917 rev/mile) is a touch smaller than our more common 155-13 (912 rev/mile).
The 165-13 tyre is 887 rev/mile. To get close to that, you would need 195/55-15 tyres (892 rev/mile) but these are two lbs heavier than the 185/60-14 tyre.
All this is of academic interest only for S1-S3 Elans, since they have difficulty in accommodating 155-13 tyres under all circumstances. S4 and later Elans ans +2s might be OK.
Also note that the 185/60-14 is H rated, the others are V rated.
David
1968 36/7988
The 165-13 tyre is 887 rev/mile. To get close to that, you would need 195/55-15 tyres (892 rev/mile) but these are two lbs heavier than the 185/60-14 tyre.
All this is of academic interest only for S1-S3 Elans, since they have difficulty in accommodating 155-13 tyres under all circumstances. S4 and later Elans ans +2s might be OK.
Also note that the 185/60-14 is H rated, the others are V rated.
David
1968 36/7988
Re: Dunlop Direzza
Posted: Sun Feb 17, 2013 9:34 pmmsd1107 wrote:Also note that the 185/60-14 is H rated, the others are V rated.
I somehow can't believe that's very relevant to our unmodified Elans. With a top speed of less than 118mph we should be well within the T speed rating considering the low (750kg) mass of the Elan. Remember that the speed rating is based on sustained speed at the rated load of the tyre.
Re: Dunlop Direzza
Posted: Sun Feb 17, 2013 10:19 pmGood point. Tyres are rated based on maximum load weight and tyre pressure. The maximum sustained speed will increase if the load is decreased or if the tyre pressure is increased.
However, the speed rating is a general indication of tyre construction. A V rated tyre will generally have higher performance ratings (cornering, braking, etc) than its stablemate rated at S, H, or T.
This is generally of no concern in normal driving conditions. However, it is the outlier conditions (max braking necessary to avoid a crash, max cornering to evade an obstacle) where the higher rated tyre rewards its greater cost. As long as you do not get involved in dicy driving conditions, do not worry about these things. I always get higher speed rated tyres, although I do not plan on needing their capabilities.
David
1968 36/7988
However, the speed rating is a general indication of tyre construction. A V rated tyre will generally have higher performance ratings (cornering, braking, etc) than its stablemate rated at S, H, or T.
This is generally of no concern in normal driving conditions. However, it is the outlier conditions (max braking necessary to avoid a crash, max cornering to evade an obstacle) where the higher rated tyre rewards its greater cost. As long as you do not get involved in dicy driving conditions, do not worry about these things. I always get higher speed rated tyres, although I do not plan on needing their capabilities.
David
1968 36/7988