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21mm internal will be fine up to 35mm, over that and I would go for a wider rim. With a 25mm rim I wouldn't go below a 30mm tire.
Are you worried about aero gainz at all? When you say inner tubes for now, does that mean you are tubeless curious? -
I have 25mm XC rims, road tires will be designed around smaller widths. Don't think it will make much a difference either way
chiroshi
Netakure
@hazzelfrazzel
Any wheel builders willing to share some expertise about internal width of rims?
Considering several options for a primarily "nice summer" road wheelset that I intend to run with 28mm GP5000s with inner tubes for now. The main bike I plan to use them on can take up to 32mm, though.
Potentially in the future I might want to fit some wider tyres and put them on the gravel bike. But definitely want to bias for road.
Options I'm looking at have either 21mm or 25mm internal widths. From online research, either will definitely be fine. What would you choose between those, and why? Would you pay a slight price premium for 25mm internal width, or not?