Geometry fun(help) (tarmac => factor o2)

Discuss light weight issues concerning road bikes & parts.
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itsacarr
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by itsacarr

I think we need a forum section just for math and geometry :)

Moving from an S-Works Tarmac (17) to a Factor o2 both size 54.

The factor Geo chart isn't super complete to fill out what's available online confidently, no wheelbase, fork length, rake ... (bike geo and comparator)

https://www.specialized.com/us/en/mens- ... 618-128857 (for geo)
https://www.competitivecyclist.com/fact ... meset-2016 (since factor no longer seems to have their own geo up)

If my math is right and it's probably not, the seat tube is .5 degrees slack from the factor to the tarmac. So if my inseam is 70cm would it be safe to assume that moves the seatpost 1cm rearward?

Anyone have any idea how those two 54's stack up? I ran 18mm of spacers with a 110mm -10 stem on the tarmac. Moving to a -6 degree 110 stem.

As usual any guidance is helpful. In other news, Specialized does a good job with their geometry charts.

by Weenie


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