The 'standard' Daren drum (6l) and the smaller one (3l) are the same diameter (198mm, 7.8 inches). The next three sizes up (10l, 15l, 20l) are a bigger diameter (274mm, 10.8 inches).

I know 2 extra inches can make all the difference - does anybody know if it is possible to get a larger Daren drum into Daren Cilau (or if anyone knows that _they_ are bigger than that and got into Daren)? I'm sure it can be done probably, just thought I would see if anyone knew...

No idea on your query.  But decathlon do a larger one the same diameter

Can't make a promise but I imagine 12 inches should be easily doable. But why?

What can't you fit in the normal sized ones?