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Cheers. With compact drops and a 380 reach on my roadbike, I run a 100 stem. On my tourer it's 390 reach, 90 stem and the same bars. Similar on my cross bike.
So the thinking is, on a 29er: 420 reach, 60 stem. Maybe a 70 or 80 stem if I want a big bar sweep. Sounds like it should work right?
The concern was if I would want / need a stem shorter than any on the market... But I'm guessing that won't happen given the numbers above.
Sort of... It's not a bad place to start.
The reach to the bars on my Talbot & Ogre is only a tiny bit longer than on my Straggler, but then I use fairly wide bars ( anything from 710-780mm ). If i was using a 660-680mm, then it'd be pretty close to mtb bars around the same as drop bar hoods.
I've found that 25-30mm extra on the bars has required 10-15mm less on the stem.
Keep in mind that recent geometry is designed to work best with a fairly short stem wide'ish bar combo and allow yourself some room to manoeuvre either way.