Ecotric Fat26 and Rocket26 Max tire size?

[WESTMIFATBIKER]

I'm looking to run winter studs. Anyone know if these bikes (with the stock 26" wheels) can accomodate anything bigger than the stock 26 x 4" tire? Does the front rigid fork and suspension fork have room? How about the rear dropout?

 

[pagegarage]

Overall the ecotric e-bikes is a low-budget option. You can read this fat bike review might be helpful.