[sr5959]

Hi guys, had a low tire warning yesterday, and when I checked the tire it was half normal pressure so I think I'll have to repair or replace. I have about 10k miles on the car so do I have to replace both rear tires? I have 17" Conti all-seasons. Thanks!

[zeezz]

Do you check regularly? If not, it might have just gotten low enough to trigger a warning, if you fill it up and it deflates more then you have a problem. To my understanding tires will lose a normal amount of air over time though.

[chrisny]

Warning comes on way before half and any normal loss should more or less apply to all tires and not be so drastic. Sudden temperature changes can have a big impact, but again, not just to one tire.. Not sure I would worry about replacing both tires to keep wear the same, but I guess that depends on how low the tread is on the one that is still good.

[sr5959]

Thanks guys, I filled it up and was able to drive to work with no further warnings, I think it's a slow leak although I can't see the cause. I will try to get it repaired.

[JUSKIDN]

extreme weather temp changes can also make the pressure go up and down

[claykin]

Most likely a puncture. Repair it. Just make sure the tire shop has a leverless tire changer. Or, you may end up with rim scrapes.