My bike too has 39mm FCRs from the previous owner. He chose them intentionally for low to mid range improvement. I know everybody and their brother gets 41s for top end but to be honest I don't know why. This bike is plenty fast on the top end and any more would only be usable on the track anyways.
Mine pop like mad but its largely because I am jetted for race gas and I have slipons that aren't so tight.
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