Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,172
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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Yeah, unless the hubshell were designed for such elevated (roughly doubled) level of cyclic loading on each spoke, the 36h flange might not be durable in use.
It would be worse if each pair of same-side spokes don't cross and engage adjacent holes at a near-tangent to the flange, that is one way that the stress level is partially mitigated.