In my experience, 2 mm is enough to generate some rub, particularly if you stand up to pedal from time to time. What you ought to do is get some 25 or 27mm tubulars... Just have to mount them straight! :-)

Thanks all.
Ti frame with large chainstays that are already crimped. I am going to run it for a bit. I dont think rub on raw Ti will be an issue. I will keep an eye on it.

I'm right there with you....

I would get a tire that's 2 or 3 mm narrower and drop 2 or 3 psi. Then you get best of both worlds.

Care to share which tire that is?

Sometimes tight is a good thing :D

I have that much clearance (or less) at the front brake caliper on the Oltre. Probably >5 at frame intersections, so not much concern over rub/frame damage, even for out of the saddle climbs/efforts. The worst of it is occasional mud gather on the caliper, which prompts me to stop and clear it with a stick. Ive been using this setup for a year with very little trouble, but that's in a SW climate. I recommend giving it a try.

trouble if you break a spoke.....

Compass SBH EL

Of the tire and stays or bibs?!?

I go with 25mm wide HED rims and 23C tires. Perfection, IMO.