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@gbj_tester
650C rims are 571mm, 26" MTB are 559mm. You'd need an extra 6mm of brake drop to make a 26" usable, and if you didn't fatten up the tyre to compensate you'd be dropping the front end by 6mm, which steepens your angles by less than a degree and cuts the trail a bit.
tl;dr - it will probably be OK