I've seen a Tarmac with a scratched downtube from a steady rack. I would advise you to get the fender compatible. It fits everything up to around a 2.4" tyre but has much better downtube clearance.
People have placed electrical tape on the rack to avoid this scratching the bike.
Currently doing this for my track bike.
@HoKe started
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I've seen a Tarmac with a scratched downtube from a steady rack. I would advise you to get the fender compatible. It fits everything up to around a 2.4" tyre but has much better downtube clearance.