Join Date: Oct 2005
Location: Philadelphia, PA, USA
Yep, I think that you're looking for a "B", not a "K". I really don't believe that there is a safety issue at all with any 'quality' tire no matter what the rating, unless you're overloading in excess and speeding your arse off for any length of time. However, the wear may be a bit more premature. "B" is a higher load rating.
Do you know when a tire is speed rated, let's say a V-rated tire. That tire is speed tested to stay safe at 149 MPH for a period of 24 hours! That, to me, is one muf'n tough tire. You can look up the H, W, or whatever for speed rating, but that doesn't change that 24 hour test. When they "B" rate the tire, they just add more load for the same timed/speed test. How much more? I don't know.
I've used the non "B" M1s since they came out, and still use them from time to time for the back because they make my K handles so well. When riding hard, I only get 2-3K out of the back and 3-4 out of the front, but the softer compound is worth the performance/handling you get from them. I now only use an M1, non "B" tire for the front because of its steering characteristics that I like with the KRS. I haven't tried the "B"s yet, and I don't really believe they'll handle any better, nor do I believe that I get too many more miles out of them. I guess I'll try one day and see, but till then, I'm simply not convinced that there is much of a difference with our bikes, unless you're really cutting the road with 2 up. Otherwise, I think that perhaps with a big fat heavy hog, then there could be a considerable difference.
No current bike.
(previous: 01 K12RS (*RED*)