Chainset/BB for on one double fixed hub

On the on one site it states
Now does this mean I'll need a 50mm bottom bracket, please help.
If you could provide a link to a product that matches it would be great.
Chainline is 50mm
Now does this mean I'll need a 50mm bottom bracket, please help.
If you could provide a link to a product that matches it would be great.
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thanks for the advice guys but I think plain old common sense (what you've offered) should have resolved this query. I now feel stupid