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The caliper mount holes and the wheel axle are connected at a fixed distance for easy adjustment. That is the whole point of these sliding dropouts.

Rear flat mount caliper mounts are (usually) always for 140mm rotors. with the extra option of a 160mm adapter (as @snottyotter hints at)

edit: or see @Phildas reply :)

Try using the brake a couple of times. The pistons should adjust a bit out (maybe...) and engage sooner

m6 and m5....

Scandinavian hygge can also be a kind of dictatorship....

tightening torque of 4-7nm (page 36)

from the bleed nipple (or fitting) ?

Shimano bleed nipples work by the bottom being jammed against a narrowing in the calliper fluid tunnel. The rubber seal is only for when it is open. So before anything else, try to tighten the nipple a bit more...

If the fitting is the right kind (straight m8 and not m6 banjo) it is easy to swap over.

https://www.lfgss.com/comments/15178667/

You could mix and match shimano levers

If the post-mount shimano caliper has the same piston size as the flat mount it is (nearly) a straight swap.
So if the caliber has 2 white ceramic pistons (...which will be most of them) it can be replaced with a flatmount one.

It looks like you can remove it by unscrewing the small cog (with 2 chain whips)

So like the left one here:

https://www.sheldonbrown.com/k7.html

The Shimano XTR M9100 XC Brake Caliper (post mount) uses flat mount format pads (so you only have to buy one sort of pads for your bike)

but it is a bit expensive.

Ha.. I thought it was a photoshop collage...

j02 is not for flat mount

all shimano flat mount calipers use the same pad size
You could use:
https://www.bike24.com/p2303937.html
without fins: K03S Resin

https://www.bike24.com/p2142762.html
k04s metal

remove

yes. maybe a bayonet fork or front fairing is a better idea.

Front brake hose in front of headtube under fairing.
rear stuff on top of stem (under a cover) into a top tube that is slightly higher

Inspiration:

(just the shapes , not the actual brake setup)

or extend the headtube (with a extra tube :)) like this:

https://cyclingtips.com/2019/12/bikes-of-the-bunch-stinner-aero-camino/

just ehhmm... neater than these examples :)

Or more importantly if I put a solid spline in there I could make a beater fixie skidder disc out of one of the worlds most expensive disc wheels...

the toothed ring is threaded into the hub body, so no.... unfortunately

Montane
Rab

Maybe youre lucky and one of these fit:
https://www.lfgss.com/comments/15470533/

prime rdo20 is a D772SB (with a slightly rounded hub body)
so yes it fits

http://www.nguide.eu/sites/default/files/mysite/hubs/54/documents/D772SB-CL-X12-11S.pdf

Thanks. Appropriate name!

What helmet is this (on Jessica Rhodes-Jones (going really fast))?

att: @xavierdisley

Maybe put a 6mm shorter spacer on this (plus cut the axle):

https://thecycleclinic.co.uk/collections/hubs/products/zenith-freewheel-hubs

or respace a rear track hub a bit

no, 4mm see included pdf