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Interesting about narrower q on the atom, that would definitely be needed for me, found it very noticeable on the gym versions, I do run my cleats slammed outwards as clearly favour a narrow q. Probably due to my slightly odd sizing I suspect some trialling would be needed as I now recall I also struggled to have the saddle sufficiently forward (this probably then impacted the handlebar reach required) once high enough for my relatively long legs (is there a name for anti trex syndrome (gibbon)) as with the angle of the seat tube on higher settings you seemed (to me) to get quite far behind the BB (as I write this it seems odd that this would much different than a standard bike so feel free to disregard).
Suspect I may be better keeping an eye out for a direct drive trainer then I can as hippy says use my bike, or possibly even demote bike to turbo duties and also buy another bike! Suspect I am an outlier with sizing, currently needed a 130mm stem to get a position I am happy with (bike fit approved) #longandnotlow I (sadly?) took a tape measure in to gym and couldn't get that close to 'my' bike fit position.
I did actually buy the clamp that allows you to use your saddle and easily swap in to a gym bike. If this reappears during lockdown tidying and someone wants one, shout up and you can likely have for p&p plus forum donation.
Q factor is 160mm on the Atom rather than 173mm on the Wattbike Pros.
Sort of in the middle of road and mountain bike Q factors.
Can't say I've noticed the difference with my road bikes, can feel the difference with my Duraace 7710 cranks, which feel too narrow at 136.3mm.
Also fixed crank length at 170mm, which also doesn't bother me, though I usually ride 165mm.
I haven't done any turbo rides longer than an hour though, so some of the fit differences might get more uncomfortable for longer sessions maybe?
You can change the handlebars, so if you can't get quite enough reach, then you could replace them with longer reach dropbars for an extra 20mm if needed?