I'm considering swapping out the suspension on my Clark (again).
I'm thinking of going to ring buckles.

The Clark has a sewn-in channel in each end that has a thick rope loop passed through it.

Like so:

Since I'm going to a ring buckle setup, I'd imagine that I want a thinner rope. But I also don't want something that's going to saw right through the gathered channel.

What rope should I use? and at what thickness?

Amsteel grey? 1/4"??

BTW, I weigh 260 lbs.