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Comparing two rims equal in materials, running a 29 x 2.4 tire, will the 30mm outer diameter rim perform that much better than a 24mm outer diameter rim?

I'd like to run CX-Ray spokes to brass nipples on shallow 30mm wide rims. If I go freehub, it'll be Chris King. If SS specific freewheel, going with White Industries freewheel and Paul bolt-on hubs. Rider weight 200lbs dry.
 

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Comparing two rims equal in materials, running a 29 x 2.4 tire, will the 30mm outer diameter rim perform that much better than a 24mm outer diameter rim?

I'd like to run CX-Ray spokes to brass nipples on shallow 30mm wide rims. If I go freehub, it'll be Chris King. If SS specific freewheel, going with White Industries freewheel and Paul bolt-on hubs. Rider weight 200lbs dry.
You better mean 24 vs 30mm width, not diameter. A 29er tire has a bead seat diameter of 622mm.

Generally the wider tire will perform better on the wider rim. An inside width of ~22mm seems to be the sweet spot for most mtb tires.
 
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