What strings did Metallica's Cliff Burton use?

[cliffburtono]

I've been heating a lot of debate on weather Metallica's Cliff Burton uses heavy gauge or light gauge strings. I used to believe it was light because of how easily he's able to bend the strings in some of his live performances, but I've been getting a lot of responses on the ultimateguitar forum that they're actually medium gauge and he's just got really strong fingers.

If anyone has an actual legit answer backed by argument I'd appreciate the input, but for now I'm just gonna have to use my 'ask the audience.'

Thank you!

 

[Root 5]

I believe he used light gauge SS Rotosound 66s. Correct me if I'm wrong.

 

[FourBanger]

Seems to Roto 66 has a pretty good consensus. However a lot of guys seem to have 'heard' they were heavy. I have also heard he used light, specifically from some sources the 35-90 Roto 66 set. Watching video I would guess he used something more on the light end than the heavy. It is my observation that folks usually mistakenly attribute heavy tone to thick bass strings, which is a fallacy.

 

[cliffburtono]

Seems to Roto 66 has a pretty good consensus. However a lot of guys seem to have 'heard' they were heavy. I have also heard he used light, specifically from some sources the 35-90 Roto 66 set. Watching video I would guess he used something more on the light end than the heavy. It is my observation that folks usually mistakenly attribute heavy tone to thick bass strings, which is a fallacy.

It does seem like it because of how high he can bend the strings in the live video. I looked around some other threads and I found the guys that 'heard from a very reliable source' that he used heavy strings, but obviously there's no real evidence for these claims. Some guy made a good point about the luthiers at Aria who equipped their CB signature basses with light gauge rotos to really duplicate the bass he was playing, so I'm gonna trust that theory.

Thanks again for the input!