I also drill holes in concrete to secure my bikes. Kryptonite makes what looks like a nice floor anchor, but I normally just buy an eye bolt (and epoxy) from the hardware store large enough to pass a fairly thick cable eye through. I'd probably consider that and a Kryptonite chain as the main security, but still wrap a cable or two to secure the wheels. After that, I'm not sue what else you could do.
I have a hammer drill you can use if you don't mind a trip to the north end of the Berkeley Hills to get it. -Ryan -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.