MT66's from Pirelli made my 250 so much more comfortable to turn and they don't follow any grooves in the road. I don't have a 450, but I imagine that the same tires would apply even in a larger size. I think my next set will be a pair of more expensive tires just to gauge their worthiness. The Metzelers have to be more expensive for a reason right. Right? We shall see. I trust the guy with 9k posts though. Can't go wrong with either tire for your bike. Cheap tires don't feel the same, my OEM Bridgestones were the worst tires I can imagine putting on any motorcycle and I would never do that to my 250 again.
Quoted from a sportbike forum concerning Metzeler versus Pirelli tires:
found SOME info on Metz site:
In its 130 year history Metzeler has always satisfied market demands with innovation. Metzeler has always been an industry leader, setting trends that others are still trying to achieve
1986 - Since the 1st January 1986, Metzeler had been a member of the Pirelli Group. A restructuring period of the existing different branches into independent companies took place, and in 1989, Pirelli founded Metzeler Reifen GmbH.
and other places...
Well-informed readers know that Pirelli and Metzeler joined forces a few years ago, a union that created a crowded tire lineup for the duo. The Diablo has the same mission as Metzeler's Sportec M-1, but Pirelli was careful not to divulge the differences between it and the Diablo. Pirelli, naturally, said its tire is better than the successful Sportec in certain areas but wouldn't specify which. To better differentiate the two brands in the future, we can expect Pirelli to be marketed more toward the sporting side of motorcycle tires, while Metzeler will edge closer to the cruiser and touring riders who love high-mileage tires, according to Pirelli brass.
even more other...
The information offered on this site relates to Pirelli and Metzeler racing tyres, both being manufactured by Pirelli. All tyres are produced in one factory located in Breuberg, Germany and distributed to Complog via the extensive Burton-on-Trent facility. Pirelli’s patented zero degree steel construction is used throughout the range. The renowned consistency of the tyre output may be attributed to the fact that all Pirelli/Metzeler tyres are mounted and checked by laser beam for complete accuracy before distribution.