bosch 20t offset 2.5mm £14.99

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https://www.ebay.co.uk/itm/BCR-70e-Sprocket-Electric-Bike-Bosch-E-Bike-E-Bike-Cog-Sprocket-20-Tooth/113079299318?_trkparms=aid=555017&algo=PL.CASSINI&ao=1&asc=53531&meid=d94b004bec7141bdb9d950fd3d62b05b&pid=100643&rk=1&rkt=1&&itm=113079299318&_trksid=p2045573.c100643.m3226

you should be able to run dual front sprockets with this so 20/16 or 20/18 with out paying the 100 euro for the dual kit from Europe.

this is the kit to give you a idea what it looks like.

 

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[anotherkiwi]

you should be able to run dual front sprockets with this so 20/16 or 20/18 with out paying the 100 euro for the dual kit from Europe.

You realise that BBB are a company from the Netherlands? (yes that is in Europe! )

 

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the dual kit from Italy is here.
http://www.speedup.bike/prodotto/corone/

so that saves a few quid

 

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one on the right is the kit from Italy tho 18t and it is also thicker but this means there is not much left for the lock ring to grab on to and always come loose on my bike.

as long as there is a gap between the sprockets for the chain it will work.

that is a 12spd chain in the pic so a different spd thicker chain might not fit the gap.

 

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new 18t as would not work with the sram one £8.50 from same seller.

 

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works in all gears with both front sprockets