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.
I assume you matched BB position, in which case it appears BB drop is perfectly matched between the two. Matching BB is best.
It looks to me like the head tube is steeper on the 55 than the 53. Is this true? This may make for snappier handling with a reduced trail. Other than that, my personal preference is to err on the smaller side since it's lighter, but that's just my bias. I don't worry about slamming the stem aesthetic.
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And everyone buying a bike should expect to have to replace the stem.
Thanks for the input. Yes I took the plots I made in bikecad.ca 's software into photoshop, gave them a color, then aligned them on the BB. Good eye! The headtube is indeed steeper on the 55, 73.5d vs 73d on the 53 (which would have more trail).
I am so on the fence. Part of me is like you and wants to go with the smaller size. However, if I don't have to, I'd rather not end up with 35mm - 40mm of spacers to get a fit similar to my current bike. Decisions...decisions...
Wise words. Thanks for the input.
Dallez wrote: I'd rather not end up with 35mm - 40mm of spacers
I wouldn't either especially since 40mm of spacers is the limit on most forks, and on some it is less.
So flip the stem up. It's slightly lighter and stiffer that way anyhow. With a 6 degree stem that will cut roughly 20mm off the spacers.
I've had my Cervelo R3s (2006 and 2009) that way since 2006 and I have yet to hear a comment in the real world about it. Not that I would care.
It seems to only be in forums that people think stem position is a significant indicator of riding ability.
I say go with the 55, out of your examples. If you find yourself becoming more flexible and aggressive, you can always use a -17 stem.
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