EVMan wrote:Since the tires have marked outer-side , and the treads are little not symmetric , but little directional , i thought they are not meant to rotated side to side and Costco will refuse to rotate.
The tread is asymmetric, but the tires are not marked as directional, so apparently Bridgestone doesn't care which way the tread rotates. As installed on a new i3, the direction that the tread rotates differs between right and left tires, so it must not matter. So Costco should not refuse to rotate side to side.
EVMan wrote:I was thinking , If max life is 20K,
If the outer side cannot become inner side side, then only 1 rotation at 10K ( 1 rotation after original)
On our Honda Insight's Bridgestone low rolling resistance tires, I did a full rotation every 5k miles because both inner and outer edges of the front tires wore much faster than on the rear tires even though I inflated the front tires to the sidewall maximum pressure to try to accelerate wear on their center tread area. These tires wore out after ~40k miles.
I planned to rotate our i3's tires side to side every 5k miles also. I bought a tread depth gauge to measure the inner, center, and outer tread depth in line with the valve stems every 5k miles. At 5k miles, I didn't detect any tread depth difference between left and right side tires, so I decided not to rotate and to measure tread depth again at 10k miles. I am happy not to rotate because I prefer the rotational direction of our Giga World 19" wheels as they are now mounted, but apparently BMW doesn't care which way any of the i3's wheel rotate because BMW eliminated side-specific wheels at the end of the 2014 or early in the 2015 model run.
EVMan wrote:if in case, the outer side can become inner side ???
One sidewall is marked "Out", so Costco should refuse to mount the "Out" side on the inner side. So there's no need to unmount the tires from the wheels except to repair a flat tire or to replace a tire.
The inner and outer tread are quite different. Unfortunately, the inner tread wears faster due to the negative camber setting and is also more shallow when the tire is new.