Same racket with a different decal (as with the Pro Tour 280 and 630 MP. ) Head used the Trisys marketing scheme in the USA but not in Europe.
Hard to compare a MP to an OS; two different animals. But, the 280 OS should be less stiff the that 260 Radical OS as the Trisys numbering system (150 through 300) reflected power level/flex.
The Pro Tour OS was only made for a few years as it was not a big seller (the Agassi Rad OS 260 was Head's primary OS racket.)
Last edited by Fearsome Forehand; 12-06-2012 at 06:48 AM.