Since you are currently on hold on the frame side, you could always opt for a Pompetamine and run a 135mm single speed rear disc hub. Just get a bolt on fixed cog and you are done.
There are a handful of polo players using one of these hub (freewheel, not fixed) and no complains yet, only caution is avoid the mistake of ordering the mini freewheel one: http://www.winstanleysbikes.co.uk/product/30777/DMR_SingleSpeed_Rear_Hub_DMR_HUB_SS_M_36R?gclid=CIfYzOKWm7oCFbGWtAodGSkATw
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Since you are currently on hold on the frame side, you could always opt for a Pompetamine and run a 135mm single speed rear disc hub. Just get a bolt on fixed cog and you are done.
There are a handful of polo players using one of these hub (freewheel, not fixed) and no complains yet, only caution is avoid the mistake of ordering the mini freewheel one:
http://www.winstanleysbikes.co.uk/product/30777/DMR_SingleSpeed_Rear_Hub_DMR_HUB_SS_M_36R?gclid=CIfYzOKWm7oCFbGWtAodGSkATw