I suggest you try a touring bike. You might find that one designed for the sort of on and off-road touring you are doing is better than an MTB, CX or gravel bike, e.g. the Spa D'Tour and/or Wayfarer.POIDH wrote: ↑30 Dec 2022, 5:00pm I come at things as a mountain biker (since early 1990's), used to...
My wife and I for various reasons are now doing more touring and day rides - on and off road. New fangled terms such as 'gravel' often appears in discussions. We still ride mountain bikes.
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I've seen some things that just seem to make sense for touring:
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Geometry which takes a lead from mountain bikes rather than twitchy road bikes.
As for the racks etc., aside from the engineering aspect covered by CJ, there is also the advantage of sticking with standardised parts wherever possible, and therefore a frame which is designed for them. If a conventional 4 point rack fails, a replacement can probably be bought from a bike shop or Decathlon in the nearest town. Moreover, standardised parts will give the greatest range of design (within the standardisation), price points and value for money. If your panniers will not quite fit on a unique proprietary rack or there is some other incompatibility or niggle, you may be stuck with the problem, because there are no alternative rack designs for that proprietary fitting.