I was looking for a little input from you guys/gals on a new frame I am considering purchasing. Based on my current bike which fits well, I seem to be in between sizes. I can see pros/cons to either size. Based on the following comparative parameters, which do you think is the better fit? FYI I currently have an effective top tube of 548mm and a HT of 155mm with 20mm top cone/spacer and a -6d / 110mm stem. Also, I only ride for fun and do weekend rides of about 30mi and several local rallies throughout the season of about 50+ miles. In other words, purely non competitive amateur.
53 (all values relative to current bike)
Eff TT: -3mm
ST : + 15mm (TT has less slope than current bike)
55 (all values relative to current bike)
Eff TT: +12mm
ST : + 25mm (TT has less slope than current bike)
53 pros: Seems to match my current frame pretty well minus the shorter HT.
53 cons: More spacers? yikes.
55 pros: Potentially could run minimal spacers (aesthetic +). Taller HT might be better as I age with the bike (turning 35).
57 cons: I would need a shorter stem or different bars to reduce reach. A 100mm would probably do the trick.
This is only my second frame so the only baseline I have is my first and current bike. I haven't switched frames before so I have no way of knowing if these differences listed are negligible or not. Also, unfortunately, assume I won't be able to take either for a test ride before hand.