CSC Gravel wheelset - advice needed on rim depth

[mahaj]

Hi all,

I’m looking at these CSC gravel wheels but I can’t decide whether to got the 40x30mm or 35x28mm rim. So basically 23 vs 21mm internal width.

https://www.aliexpress.us/item/1005006281662446.html

I run 40mm wide tires but want to keep options open for tyre sizes between 28 and 45mm. I mostly ride smooth gravel with occasional rocky single tracks. Not looking for aero gains but some weight savings conpared to old Mavic Allroad alloy wheels.

The trend seems to favor wider rims but I feel like 21mm internal might be sufficient.

Any comments are appreciated! Also in general wrt these CSC wheels.