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Originally Posted by GregS
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I use these too and they work great. Not on the 250's 3.5" rear rim though, these definitely need the 4" rear rim of the 300, nothing narrower.
It might be interesting to know that Kawasaki Japan just announced that the domestic market Ninja 250 "KRT Edition" (whatever that is) will be getting Bridgestone S20 110/70/17 and 150/60/17 for what they describe as "improved handling".
I've heard a couple of faster guys on 300s tell me that they had to go to a 150 rear because they were running out of edge with a 140. But then again I've heard people say a 140 rear is fine for racing so who knows. In general however, a 150 is generally considered optimal for a 4" rim. 160's need 4.5", 140 need 3.5", 180's need 5.5", and so on. But there is obviously some flexibility to these rules.