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This is the preferred single-row bearing for kart racing and performance engines for its low contact ball bearings and race(bearing cage).
AKRA Rules for Crankshaft Bearings
Any 9 ball self-aligning bearing allowed. NO ceramic bearings allowed. The bearing may be clearanced for slip fit in the block.
NKA Rules for Crankshaft Bearings
Crankshaft bearings shall be of metallic (magnetic steel) construction (excluding retainers) and be of conventional design and stock appearing and the same dimensions as the OEM bearings. This includes inner and outer races as well as the balls and rollers. No other materials allowed.