Narrow bars

My shoulder width is 44cm, and I've got 44cm bars on my old bike and been perfectly comfy. I've just taken delivery of my swanky new steed and the shop specified 42cm as the chap said my arms were a bit flared out.
However as the spec was for Deda bars, 42 is measured edge-to-edge, so the comparative size of these bars is actually 39.5! They feel very narrow and a bit unstable.
When the bike was fitted I was told (and I trust the guy, you understand, he's a good mate) that my arms were parallel and hence the bars correct.
a. Does this mean the match-bar-width-to-shoulder-width rule of thumb is, in fact, dubious, and loads of broad chaps are running narrow bars?
b. If I get the 46cm Deda bars (i.e. 43.5 in the real world) am I likely to have insufficient cable length to easily swap them over?
Seriously losing sleep over this - I run the risk of insulting my friend.
However as the spec was for Deda bars, 42 is measured edge-to-edge, so the comparative size of these bars is actually 39.5! They feel very narrow and a bit unstable.
When the bike was fitted I was told (and I trust the guy, you understand, he's a good mate) that my arms were parallel and hence the bars correct.
a. Does this mean the match-bar-width-to-shoulder-width rule of thumb is, in fact, dubious, and loads of broad chaps are running narrow bars?
b. If I get the 46cm Deda bars (i.e. 43.5 in the real world) am I likely to have insufficient cable length to easily swap them over?
Seriously losing sleep over this - I run the risk of insulting my friend.
Андрю
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Alu is real.
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Alu is real.
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You are kidding? At the end of the day you need to be comfortable riding your bike and if that means running bars that are wider than he deems appropriate then that's your prerogative. If he's insulted or offended by that then he isn't worthy of friendship.
Road - Wilier Izoard Centaur/Cube Agree C62 Disc
Allround - Cotic Solaris
******************************************
Alu is real.
******************************************
Alu is real.
Its a new bike - it will feel different for all sorts of reasons.
Personally I'd give it a good few rides and see if I can live with them. If you see Ed Clancy riding his bike - his bars are really narrow - and he's a big guy. Works for him. Marginal gains maybe ??