SKS/Rose hobo front mudguard mount

Intro

The rose hobo mudguards are really bad. Just read the reviews… https://www.rosebikes.com/sks-germany-hobo-mudguard-set-2719507.

Rear Mudguard mounting

On my size small the rear mudgard fits by drilling a hole about 1cm above the original at the bottom of the mudguard. This allows the mudguard to fit in the normal ‘small’ spot and seems to be at a good height.

Issues with original

However the front has multiple issues. Rose offers two versions of the instructions, one mounting the mudguards to the inside of the fork, one to the outside. On top of looking ugly, the outside position means you can't use the fork mounts any longer, they seem to be the newer instructions, and i suspect they might work, though you'll need be very generous with spacers and probably trim the metal bar. In any case these are for the inner mounting, note you need to remove the inner plastic covers, this is not very easy, I have no good recommendations except to be patient, they are not inserted that deep into the threads, probably a good solution is actually to melt them away with a soldering iron, I used a pick.

You can see in the picture that the original adapters need a spacer (included but not documented) and won't clear the brake hose which is not movable and not very flexible.

 The instructions from rose simply ignore this - calipers don't exist and the mudguards are flush, note the wrong torque setting to boot…

Description

These adapters replace the SKS parts at front and allow for a more flush mount and also allow the bar to go in a few more 5mm longer which should make it look way nicer. I also trimmed the bar another ~10mm.

You do need to also bend the original bar so it is much straighter than it is, this allows to fit it deeper and makes the print flex less, which will also make it much stronger.

The print also has a slight reinforcement to make it less likely to snap, but the trick is probably to just print it in the non obvious orientation. Note that I accidentally printed two lefts which is silly but nice to see what the length of the bar should be (since you can see how far it's inserted.

Print recommendations

I'd recommend printing petg at 100% infill (it saves basically nothing to go for 5 perimeters or something decent). My original print is very weak on the fork mount spot, so i made a reinforced version which also includes a left leg version.

The second set (that I now use are in PC blend at 20% gyroid infill, 5 perimeters). I included a print file which is the way I'd recommend to print them for extra strength, less supports are required if you are using PETG which I think would work fine and probably deforms a lot less.