How Flat a Radius to not fret out w low action?

[tribalfusion]

Does anyone know technically how flat a guitar's radius needs to be to bend without fretting out if the action is in the 2 or 3/64ths of an inch range like Holdsworth's action on a neck with little or no relief?

Is 16" a flat enough radius or does it need to be 20" or higher? Allan himself uses a 25" inch radius and his signature model is a 20" radius though he himself doesn't bend much these days...

Thanks

[JAMESAK51]

16" is plenty flat if you don't have any neck or fret issues.My charvel model series and my Jackson have a 12"-16" compound radius and I had very little trouble setting them up at 3/64" on the low E and 2/64" on the high E at the 12th fret. All of mine are buzz free.
Hope this helps!!

[sully]

you can get by with 12-16. It's also important that your frets are level, have fallaway up the neck, and the bridge radius matches.

Sully