Will these fit Specialized Sirrus 2011 Hybrid Bike
I'm worried that the tube is more oval than round
I just posted a review and I have a Sirrus and there is cabling underneath the bottom. You need to add foam or similar to the mudguard to give clearance from these cables.
They do the job but it is down to you if you want to go through the hassle.
It just so happens I had some foam used to lag water pipes and it was a 10 minute job to them sorted,