I am aiming at my first Ironman in 9 months. I have raced a few Half-IMs and used Sidi T2 Tri shoes with zero troubles.
I also do some training in Specialized Road shoes. These have been equally comfortable but I broke a snap and need to replace them.
With a purchase in mind I wanted to see what people thought of as good Ironman Biking shoes. I have never surpassed 70 miles and I am curious if I will still love my Tri shoes at 112.
Specialized tri vents have always worked well for me. I use them as my road shoes, and racing du/tri (sprint to IM). Under 60 degrees out they get pretty chilly though.
I had the same shoes and was fine up to 100 miles or so and then I would get really bad pain. That’s just me though, plenty of people have no problems, you’ll find out by training. I wear LG tri shoes now, they’re wider and that works better for me.
I have a pair of Time RX Tri Carbons and have had zero issues in any race distance including IM. If the shoes fit well and are comfortable I think you will be fine.
specialized BG trivent have performed well on all my rides and ironman races. huge fan. you could give those a try, otherwise just stick to what has worked in the past.