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Sounds like the datum would be a good fit then if stack is the same and standover is smaller.
I ride a 110mm stem off road and it's more than fine.
So all depends how you want the bike to feel!
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Id say you’re overthinking it but you might actually want a shorter reach anyway and therefore not need as long a stem as you think.
Plus dunno what width bars you ride on your caad but you could go 2cm wider bars for off-road which could warrant a 1cm shorter reach too anyway.
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Put a stem that’s 20mm longer than standard and set at a positive angle, Job done.
Josh
greeno
edscoble
@jono84
Internet bike fit/gravel riding question.
I normally ride a 54 CAAD road frame with not much seatpost and very little standover clearance as the stack works for me. I've been thinking of making a switch to something more durable/comfortable and by chance my girlfriend has offered me her XS Datum as she isn't using it. Geo charts tell me stack is essentially the same but the reach is 18mm less on the Datum. Before i get excited and start trying to make it fit me i thought i'd ask the hive mind if it's a road(trail) to nowhere.
Looking at most the bikes posted here it seems like longer top tubes and shorter stems is the norm. The wheelbase on the Datum is still 10mm bigger then the CAAD but would i be at any significant disadvantage with a shorter top tube other than i'll need a longer stem which isn't ideal for getting rad? FWIW i'd be using 165mm cranks. Standover difference is 30mm but i would have thought that would be a good thing if i want to do sick jumps over bumpy stuff.