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165s are always best but 170s shouldn’t present too much of a problem ons pepper track frame like an Omnium. I don’t think you’d get turned away anywhere for them.
That said, I’d recommend having a good think about why you want to deviate from 165.
170s seem to be mainly used by the “I started riding track recently and think these will make me faster somehow” brigade if you know what I mean.
As for bars, just get any road bars. Probably something on the narrow/shallow end of things but that’s pretty much personal preference.
Started track cycling and am building up my own bike. Getting stumped on what bars to get. Can anyone recommend any non-sprint track bars?
Also, looking at getting 170mm cranks. They'll be fine for Herne Hill and maybe some indoor velodromes right? Don't know the BB-drop of the frameset (Giant Omnium) that's on the way.