Mike,

It is 57mm.  2-1/4" should work.  many of Japanese 70 size ARFS use 57mm. Kyosho Oxalys, Osmose etc.  I believe Hirobo also uses same size.


Where can I get one of the Zeque 70?  I tried to get them directly from China, but the shipping charge was amazingly high not to mentions the price of the ARF.

Ihncheol