what's this on the bottom bracket?

02gf74

Old School Grand Master
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the 3 bolt hole thing on the bottom bracket - is it for some chain holder device?

641721497_tp.jpg
 
Wow! These are so so rare i had only ever heard of them before this. What you have here is a super dooper mount for brushed dmc cranks. They are supposedly hard to get going but once started reach 88mph easily. They bolt on to a plate with 17 m10 bolts which then bolts on to that mount. The titanium copper mix makes them rust free and you can have a 6t cog if you wished.

Was it expensive?
 

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