Bosch W 260 T2 spark plugs

I thought the 260 was closer a B9 NGK? When I went from 260s to the NGK I went 9s and have never had a prob. Maybe they're b/w 8s and 9s? I do know that 240s holed pistons very nicely in SF2s, did they not, Lee!!  :o
 
Yeah, 160kmh+ touring with you on the back. 140 mains and W240 (B8)was under the safe margin  We did plenty of it with 145 and W260 (B9) after that.
Normal riding is fine with B8. I have Champ N3 in my road SF atm, between 8 and 9.
 
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