hi dave, as far as i know they are not legal yet at brca events.although a few t/c winter series are allowing them to run along side 19tmotors.our local club(stafford),allow you to run them ,and the 13.5's against 27t motors. there are a few racers now using the 10.5's on a weekly basis at club level. ask your local club if its ok to run,should be no prob really.
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