I used to mount 24's on Serpent 26mm rims..(this way they would fot my Impulse,HPi's and tc3's)..
it was all the fad 2 years ago,so i tried it..
But I forgot who it was I was talking to..(a world champion,or a tire maker,I forget all the people I know)..anyway,he said doing this causes those wear marks in tires to be worse the usual..because your still using a 24 mm insert,and THATS what doesn't sit on the rim..its to small and shifts side to side..
I started mounting them on HPI 24 mm wheels..much better results..and wear..
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See Fastharry in Super Nitro racing at the HPI CHALLENGE...