Got a feeling a 118 might be a bit tight! might just about get away with it if your not running front freewheel with a small 18/16 tooth up front. I ran a 128 on my old one with ffw, im guessin youl prob need the 128 to be honest!
Someone had difficulty finding these on here a while ago, your best bet is to post a topic in the wanted thread! Worked last time,someones bound to have one kicking about