That's what I originally thought Andy, but check this out... The 160 is at the bottom of the table. When I spoke to Bridgestone, they confirmed that the 4.5 was the ideal fitment also... I always thought I'd have needed a 5.25 or 5.5...

http://www.bridgestone-eu.com/bfe/v/index.jsp?vgnextoid=00000000000000000000001_2_260articleRCRD&vgnextchannel=000000000000000000000000000000000396RCRD
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NSR300R - Why did i ever have a 250...