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That mounts like an e-type derailleur right? So it shouldn't be a problem.
Only thing I'd be concerned about is the thickness of the plate reducing the amount of axle the NDS arm clamps down on to.
Howard-
Yeah, that was my thinking too. Plus a lot of MTB chain devices are mounted like that on modern MTBs with external bearing cups, so it can't be a totally ridiculous design. One concerns is that the area of the bracket that will be clamped is not totally flat, but has several, regularly-spaced raised areas, presumably to allow them to be slightly compressed and add grip. I wonder if that could result in everything not tightening up straight.
There's actually already 2 spacers between the frame and drive-side BB cup. The design allows for them apparently, so I wouldn't lose any clamping area.
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^^ This.
Also, I’m not sure what you mean by coaxial in that context. Concentric maybe? If so, that won’t be an issue either. As long as the BB she’ll has been faced off properly then it’ll be fine.
ffm
jj72
I ran my last daily bike with a chain guard (SKS Chainboard), which attaches via a bracket that's clamped between the drive side BB cup and the frame. That bike had a square taper BB and that never caused any issues (after I had tightened it up properly). My new daily bike has external BB cups (Hollowtech 2) and I've been advised that it's a bad idea having that type of fixing because there is a risk that the BB cups (and therefore bearings) will end up not being coaxial, which would lead to greater bearing wear and possibly early failure.
Is that true?