So, I've been racing for a few years on a 53cmTT Raleigh Rush Hour Pro with Reynolds Track Pro fork. Current position has a setback seatpost, 110mm 10d stem flipped up with 117mm total HT stack under the stem.
It meets my needs perfectly adequately, but I had some time on my hands and went through the general calculator on Tiemeyer's website and it recommended a minimum 55cmTT for me. (see attached screenshot)
I've got my fit really quite dialed in over the last years, and I race RR/Crits/etc on a 54cmTT bike with no spacers and a -12d stem... I'm very happy with my track position, but it is achievable on either a 55 or a 53.
Is handling on steep tracks the reason Tiemeyer would recommend a larger bike (shorter stem, longer top tube for different steering input response time)?
At 145ish and 5'10, I'm very much an enduro with workable pursuit legs... so sprint geo isn't something I'm worried about.
Admittedly, I race on a 400m track with 27ish degree banking, so anything works there - but this year I'll be traveling to Alpenrose, Burnaby, and Col. Springs - I'm thinking about it now & trying to sort it out before the season hits.
A teammate has a 55cm Rush Hour Pro that I can trade for, so the option is out there and I'm not sure.