Are my tires supposed to rotate on the rim? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

thstone · 09-23-2018, 06:50 PM

It is completely normal for a tire to rotate on the rim (to some degree). With that being said, 360 deg in 20 mins seems somewhat excessive.

And yes, this could easily cause an out of balance situation. The wheel and tire are balanced with the tire at a certain location. If the tire was to creep around the rim, then the weight might not be in the correct location in relation to the tire causing an out of balance condition.

A better way to check this is to mark the tire at the location of the valve stem and then check later to see if the mark on the tire has moved in relation to the valve stem.

speedyspaghetti · 09-23-2018, 07:12 PM

Quote:

Originally Posted by thstone

It is completely normal for a tire to rotate on the rim (to some degree). With that being said, 360 deg in 20 mins seems somewhat excessive.

And yes, this could easily cause an out of balance situation. The wheel and tire are balanced with the tire at a certain location. If the tire was to creep around the rim, then the weight might not be in the correct location in relation to the tire causing an out of balance condition.

A better way to check this is to mark the tire at the location of the valve stem and then check later to see if the mark on the tire has moved in relation to the valve stem.

Good idea - I'll retest again tomorrow and see if it is still just as bad. What could be causing this? An issue with how the tire was mounted? Or maybe a defect with the rim?

Burg Boxster · 09-24-2018, 07:23 AM

Quote:

Originally Posted by thstone

It is completely normal for a tire to rotate on the rim (to some degree). With that being said, 360 deg in 20 mins seems somewhat excessive.

Yep - agree 100%.

Always chuckled when I ran Toyo Proxy R888s and how much they moved around a rim... particularly rear. I'd index when mounting new and see how quickly I could get one to rotate 360 degrees around...

speedyspaghetti · 09-24-2018, 07:53 AM

Quote:

Originally Posted by Burg Boxster

Yep - agree 100%.

Always chuckled when I ran Toyo Proxy R888s and how much they moved around a rim... particularly rear. I'd index when mounting new and see how quickly I could get one to rotate 360 degrees around...

I'm guessing it took you more than 20 minutes?