My tyre size not available as an option

Hi,
I have a Canyon Endurance AL 7, tyre size is 700/30. The closest ones that Zwift offers me:
700/28
700/32

Does it matter much which one I pick?
Thanks,
Pa.

Either should be fine, but can you give a complete rundown od your setup.

Also, read this: https://forums.zwift.com/t/how-does-zwift-determine-my-speed/

Hi Paul,

I’ll read that- thanks.
I have the Canyon bike, dumb trainer (Tacx Blue Motion), Wahoo speed & cadence sensors, laptop with bluetooth & wifi connection.
Thanks,
Pa.