aside from the effect of seat tube angle difference, is the head tube angle the same? the top tubes may be near the same length, but do they intersect with the seat tube and head tube at the same height? is the stem height, angle and length the same? are the bars the same?
between all those it'd be easy to end up with way more difference than 50mm
Reach values can easily be misinterpreted because they are only comparable at the SAME stack height. If you're you're comparing 54cm and 56cm frames, for example, the later may have a 20mm taller head tube. You should subtract 6mm from the reach of the smaller frame to bring it up to the same minimum height as the larger frame. The difference in reach will then be 6mm greater than shown in the geometry chart.
Unless you have something totally odd like a 76 degree seat tube angle combined with an 70mm head tube it simply isn't possible to get a 420mm reach with a 541mm top tube.
You need to measure your stack and reach the same way Canyon does, and then correct the reach for any difference in stack to get a proper comparison.
I suspect your measuring reach on your current bike to the bars rather then to the center of the head tube?
http://velonews.competitor.com/2012/05/ ... lly_216035
http://www.cervelo.com/en/engineering/t ... d-fit.html
http://gearinches.com/blog/misc/bike-ge ... comparator" onclick="window.open(this.href);return false;
CarlosFerreiro wrote:While it's not the traditional approach, I think stack and reach comparisons make it easier. Depending on the manufacturer's geometry ideas you can easy get their 52, 54 and 56 models with essentially the same reach, just different stacks.....
my crux and my sworks sl3 have the same "effective t-t" 537mm from specialized
but the crux has a stack of almost 25mm higher and reach 10mm shorter than the sworks (making it more upright for me, which is fine for cross). Also* angles make a big difference.... same reach even could be affected by steep or less steep seat tube angles. the smaller seat tube angle (and going up higher) u will go further away from the bars.
cervelo has some nerdy power point presentations on stack and reach.
from what i've seen about cervelo and canyon., they both seem to have a similar "style" in taller headtubes (stack) than their other competitors of the same "sizing"
If two frames have the same reach, but different stacks, then the reach should be corrected to the same stack height on both frames, for a proper reach comparison. You would subtract 3mm of reach for each 10mm of stack height difference, from the reach of the smaller frame.
Of course a smaller frame with less stack could be setup with a lower bar, but most comparisons are made, assuming that the fit is intended to be the same on both frames.
But if you ride a 75 degree sta combined with no set-back seatpost or 73 degree sta with a seatpost with lots of setback it'll be difficult for you to get the same position on a 74 degree sta. So sta is something that should be considered when comparing geometries.
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