They're close to Sport 40 but make sure you get a overall length. I ran into that problem with my 1/10 scale Bud T-6 kit thinking that it would work. It's 1" to short to run in sport 40. I extended the length and flattened the rear. Now all is good. I would also widen the 1/10th scale 1".Maybe a dumb question but is 1/10 scale close in size to a sport 40 or sport 21?
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