I could live with 42 in the middle and that'd leave my 52 for the occasional overdrive gear or two and I'd have enough on the low end just using a 28 tooth inner ring. It turns out on both the stronglights I have the 52 rings are basically toast anyway so I'd happily run a 42-28 compact double and eventually snag another 52 ring off ebay or something... 'course there will be derailleur issues to sort out too. Anyway this is an exciting thread now!