My Metzler Roadtec (rear; I guess front will be here soon but don't need to install unless to match brands) arrived today (2 day shipping), has a much deeper grooves then the Michelin PR3/4, and the original tires. I don't mount my tires so I can not tell you how hard that would be. I know lots of BMW riders use Metzler tires, so I hoping to get good results. I ride Avon AM21 on the '84 BMW R100RT at present, but don't use that machine very often. I went to Avon because the Metzler Lasertec (size requirement 3.50) has a groove right down the center of the front tire: which follow rain grooves not very pleasant . I really should ride it more, but it is much harder to start in cold weather and I guess I just always jump on NT and more mileage. I really like both rides, they are some what similar, and both get many second looks. Most thing both are BMW's, and I guess they are kind of brothers in design uses.