At silverstone indoor I was running a 19 as people said it was right but I lacked both punch and speed on the straight with a 6.5 speed passion.
I then went up to a 21 which was better and kept increasing until the temps got to high but I ended up on a 23t which I use indoor and out. Indoor I added boost but outdoor I don't run any extra. This is at Coventry which is a big outdoor 1/8 track
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