Honda Element Wheels and Tire Size options

Wheel and tire options
Stock Element wheels
If they are on 16 in wheels, most Element people use tire sizes from 215 to 235 in width. 
For example, the Falken WildPeak H/T02 are a popular option for those who want to do light offroading (https://www.tirerack.com/tires/falken-wildpeak-h-t02)
These are the 16 inch tire sizes that I have seen people use on stock wheels: 215/75/16, 225/75/16, 235/70/16. Sidewall height can vary depending on tire brand and model. 
If you decide to go with the larger 235/70/16, it is highly recommended to run wheel spacers (at least 1"). We make our own with ARP studs (see link below). Also, the larger tire may contact some of the plastic splash guard pieces when you are full-lock. 

You will need the set of wheel spacers (4 pieces). 
https://aerogenicsusa.com/products/offroad-spec-hubcentric-bolt-on-spacers-arp-studs?_pos=1&_sid=4003491c6&_ss=r

Aftermarket Wheels
Another option is to use aftermarket wheels. This option will not require wheel spacers since they are lower offset. 
Our wheel collection: https://aerogenicsusa.com/collections/wheel-accessories

Our most popular wheels, 16x8+20. You can run any of the tire sizes mentioned above. We include hubcentric rings but you will need to get tuner style lugnuts (see link below)
https://aerogenicsusa.com/collections/wheel-accessories/products/offroad-mst-wheels-gunmetal-16x8-20
https://aerogenicsusa.com/collections/wheel-accessories/products/offroad-mst-wheels-bronze-16x8-20

I have these wheels on my Element which can also fit the same tire size as above. 
https://aerogenicsusa.com/collections/wheel-accessories/products/offroad-mst-wheels-mt45-matte-bronze-16x7-35
https://aerogenicsusa.com/collections/wheel-accessories/products/offroad-mst-wheels-mt40-matte-bronze-16x7-38

Lugnuts for aftermarket wheels
https://aerogenicsusa.com/products/carbon-steel-lugnuts?_pos=1&_sid=31ba3731e&_ss=r