# Driving with a slightly bulged tire is dangerous?

**URL:** <https://community.cartalk.com/t/driving-with-a-slightly-bulged-tire-is-dangerous/181365>\
**Category:** Maintenance/Repairs\
**Created:** [December 21, 2021, 3:39am UTC](https://community.cartalk.com/t/driving-with-a-slightly-bulged-tire-is-dangerous/181365 "2021-12-21T03:39:26Z")\
**Posts on this page:** 1\
**Showing post:** 36

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**Author:** ![CapriRacer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/capriracer/32/22_2.png) [@CapriRacer](https://community.cartalk.com/u/CapriRacer)\
**Post date:** [December 24, 2021, 10:48am UTC](https://community.cartalk.com/t/driving-with-a-slightly-bulged-tire-is-dangerous/181365/36 "2021-12-24T10:48:25Z")

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And just so everyone knows, the problem with the Firestone tires in 1978 was a chemical they (and everyone else) used to promote adhesion of rubber to steel - HMT (hexamethylenetetramine). In the presence of water, it turns into an acid - and it turns out that water vapor can diffuse through rubber. Firestone was the last to discover the problem and replace that chemical - and that’s why the successor to the Firestone 500, (the Firestone 721) also had the problem.

The way the company handled this became a textbook example of what not to do!

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