Chief has it… the Plus frames are 23 / 24 / 25″
The 23″ is a Spaceframe as this offers excellent standover clearance. Its geometry is the same as the 24 and 25 Diamond Pluses. When I say same this is shared ‘Jones Geometry’ for the PLUS models, just as the 29 frames have their own version of ‘Jones Geometry’. The sizing of the two models (Plus and 29) is such that a 24″ Plus is the correct size for a rider who would ride a 23″ 29 Jones.
That makes things a little clearer? Jeff will then talk about stem length and straight/layback seatposts and seat angles and rake and trail and rim width and tyres and tyre pressure and much more. Passion.
In other news – Jeff spoke to Rohloff man at Interbike. They are making a 148mm thru-axle Speedhub and will work with Jeff to create the precise bolts (etc) needed for it to fit a Jones Plus.
Errors and omissions excepted. Any (other) questions, do ask.
Best (not) in Show… http://www.bikepacking.com/plog/2016-interbike-awards/