I'm replacing my tires on a 08 g35x and wondering about the existing tire valve stem. It's aluminum which means the tpms sensors are on the valve right?

When the tires get replaced, do they reuse the valve stem?

 

They should re-use the whole valve/tpms assembly unless they find something wrong w/ them during inspection.

 

True, I got new wheels and tires. The tire shop just reused my old TPMS sensors/valve stems without any problems. FYI, just make sure they remove the TPMS sensor correctly. I saw a you tube video where the technician accidentally snapped off the TPMS sensor while removing the tire from the wheel. Check out this video at about 1:20 to see what happened. Notice how he was breaking the bead on the tire exactly where the valve stem is.

 

If you are just replacing the tires and didn't have a leak, you don't even half to touch the tmps. Make sure they don't charge you for valve stems or tmps servicing. Down the line, it might be worth it to have the servicing done which involves removing the tmps and replacing the sealing 0-rings.

 

My bad, I assumed it was a new wheel install. Good video link too.