it is very likely all you need a 110BCD 38t chainring. what kind of cranks? deore? something like this would likely be perfect
http://cgi.ebay.com/Profile-37t-110-...item439da33d34
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk