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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?
chiroshi-
Thanks for a quick response! And good questions :)
Hmm yes, so maybe I'm asking too much of a single rim, and should stick with 21mm and keeping it as a road set. Why not below 30mm for 25mm rim, out of curiosity?
Nope, entirely not worried about aero gainz.
I love and use tubeless for gravel tyres. However, not at all curious for road. If we end up in a place in ~5 years where 32c is the norm for road, I'd probably explore tubeless at that point.
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Have you ever ridden 28c tyre on a 25mm internal rim?
hazzelfrazzel
broken_777
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?