You are talking about the first generation Volt from 2011-2015 which was a heavier car than the Bolt EV (about 200 pounds heavier). It originally came with Goodyear Fuel Max 93H tires. I'm not certain what tires came with later model years like the 2015.If I remember correctly, US Volts1 came with Goodyear 93's and had some sidewall blowouts - at least I read some reports on gm-volt forum - and were upgraded to 94s.
In Europe, Ampera initially came with Michelin Energy Saver tires rated as 94 and had no sidewall blowouts.
The second generation Volt 2016-2017 and the new 2017 Bolt EV both come with Michelin Energy Saver A/S 91H.