Don, thank you for pointing that out and if our record drought continues I could probably get by on slicks. Note the very even treadwear pattern despite running these tires at 60psi. Since I AM in the market for replacement tires (the default being our stock Dunlop Enasave) and I like my stock alloy wheels, my priority is a tire with the lowest rolling resistance, willing to sacrifice handling, noise, comfort, treadwear, etc. Anyone have any suggestions for the latest and greatest?Don wrote:It looks like your tire is worn out, Joe - I can see the wear bars worn flush. Time for a new pair
Wonderful observation! Have to remember that one.MLucas wrote:The new i3 from BMW is equipped with the skinny tires. Another I-MiEV first copied by competition. Funny no one is complaining about them on a BMW.
I think if you showed that tire to anyone with any expertise in tires, they would immediately tell you it has been run severely overinflated. All of the tread in the center is gone, while both outer edges still have tread - Pretty much the exact opposite of what you see on most worn out tires. The outer edges are designed to 'bite' in to prevent the tire from sliding sideways, so they are usually the first to go when the tire is run at the recommended pressureJoeS wrote:Note the very even treadwear pattern despite running these tires at 60psi
JoeS wrote:SPARE TIRE
FiddlerJohn wrote:...The T135/70D15 pressure was 21 psi without a TMPI sender. That's why it was warm to the touch, but WHY WAS THE TMPI INDICATED? All four OEM tires with TMPI had 50 psi.
The chart doesn't jive with your 24.4 number, does it? The Revs/Mile is way off tooFiddlerJohn wrote:My OEM front tire is 145/65R15 with a 24.4" Overall Diameter.
I *think* the iMiEV's computer did that to you, on purposeNow the interesting part:
At the junk yard I put the T135/70D15 on the front left and set out for home which was forty some GPS miles away. My RR was 9 more than the GPS so I felt safe. After hypermiling for 14 miles my RR was only 2 more than the GPS. I expected the difference to increase, but it was deceasing and fast. It was starting to get dark. At this rate I wouldn't make home. Or possibly get stuck in a toll tunnel.
Then the TMPI (tire monitor pressure sensor indicator) on the dash lit up. I pulled into a McDs and put the OEM wheel/tire back on. The T135/70D15 was warm to the touch but looked like it had good pressure. In a short distance the TMPI went out.
I got home with RR=1. The T135/70D15 pressure was 21 psi without a TMPI sender. That's why it was warm to the touch, but WHY WAS THE TMPI INDICATED? All four OEM tires with TMPI had 50 psi.
Don wrote:... The chart doesn't jive with your 24.4 number, does it? The Revs/Mile is way off too ...
Don wrote:... It monitors the ABS signal from each of the 4 wheels, so it noticed your left front with the smaller tire was turning lots more revolutions per mile than it should be, so it *knew* that one was very low on air, which triggered the TMPS indicator on the dash. The RR meter also calculated in the extra drag on the car running with a nearly flat (so it thought from it's calculations of the Revs/Mile) so it knew you were not going to be getting the 'normal' miles/watt hour and it was alerting you to the fact that you weren't going to be getting the range you expected
These darned 'smart cars' are pretty tricky, aren't they?