Mudguards

are they reusable? I also assume that they would require digging a bit into the mudguard, not sure how that'll turn out after a few removals.

they are resuable a couple of times - and no they dig in to each other.

The issue is you're supposed to replace them after a couple of cycles of tight / loose / tight etc.

The thought of wrapping every single bolt each time doesn't seem very appealing to me either ;)

I though that wedgelocks required also digging into the material to prevent spinning. If they're just digging into each other, what's the difference with a standard washer?

I got an reply from Berthoud by the way : they confirmed that you can't re-radius stainless steel mudguards (at least not without specialized tools), contrary to aluminum ones.

here you are

https://www.nord-lock.com/shop/everyday-applications/how-it-works/

Nice clip!
I used them to secure some Ali door card on the rod after every other fitting coming loose within a week of use, the wedges didn’t budge after years. I must have had them on and off at least a dozen times during the build and I didn’t change one of them, so I wouldn’t worry about reusing them. There was also only a very small witness mark on the panel.
The RS ones are just faux Nords.

Thanks, nice explanation, though it definitely relies on digging a little bit into the material : "When the bolt is tightened, the teeth grip and seat the mating surfaces".

@Chaley and yourself convinced me, I'm gonna try them out before drilling through my frame. Do the copies work just as well? The nord locks are stupidly expensive.

I’ve not used the Nord ones, but the rs ones worked fine (for my application) still not super cheap, but they stopped the daily game of find the noisy bolt and there are about 150 of them in the interior! Oh and I didn’t torque the bolts up as much as I did with spring washers.

I'm still interested in how they're coming loose technically. I've had loads of muddies on loads of bikes and never had one come loose.

Why would one come loose on a mudguard, but not say stem bolts?

Is it something to do with the threading or something?

Sorry, genuinely interested. (Mostly in case it's just luck for me and I should be more careful!!!)

I honestly don't know and keep wondering the same thing. I've never had that problem happen with racks for instance, and I don't loctite any of these bolts. I've also noticed that it is mostly happening to the vertical (or almost vertical) bolts on my bike : the one under the fork crown and the one under the seatstay bridge.

This is a bit counterintuitive according to the Junker test described in the link sent by @MCamb, which seems to be based on the fact that "shear loading perpendicular to the fastener axis is the most severe form of loading for vibration-induced loosening" : you'd expect bolts parallel to the road to loosen first, as most of the vibrations induced by the road are, I assume, vertical.

If I understand correctly the Junker test, the plate under the fastener has to actually move to have any effect though (at least infinitesimally), so if I had to take a wild guess, I'd say that there tends to be more surface area (and thus more friction) at the dropouts between a rack and the frame, than at the tiny contact point between my mudguard and the seatstay bridge.
Totally unsubstantiated claim though.

Based on that, I think it would be down to the mudguards vibrating/shaking at a different rate than the frame.

Does anyone have a single one of these p clip things for mudguards they can post out?

£25 for the hardware kit for one piece seems a bit mental.

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not that hard to make if you have a file, hacksaw hammer and some time on your hands...

Anyone running mudguards on their gravel/big tyre bikes? If so, what's the go to for 700c x45mm tyres?

GB / PDW / SKS all do 55mm guards

I like the sks edge fenders. Solid and affordable, much better then the sks bluemels.

And Honjo, Not sure of stock, but they were only £70ish in Bikemonger the other day.

looks like they only have 48mm which isnt wide enough

Thanks, like the look of those, and importantly the price. Had looked at PDW as ran them previously, but oh my days the price!
46 or 56 for sizing? I'm guessing 56 for more coverage, hopefully my frame will fit them.

always +10mm on your tyre size

56 it is then. Add that to payday shopping basket

Anyone tried to fit mudguards to a Genesis Longitude (27.5)? I’m struggling to figure out what type of mudguard to buy and how I’d attach it. It doesn’t seem to have a seat stay bridge or a bolt by the bottom bracket which isn’t very helpful. The frame is otherwise covered in mounts so this seems like a weird oversight to me.

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I'll see if I can find the photos, but I used a p clip and spacers on the bottom bar, and I used a bent bracket from one of the side bolts, creating a mounting point central.

Edit, found them

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That’s super helpful thanks! Did you put anything down by the bb on the seat tube?

You can't do as below because of the yoke but maybe you could fit a light bracket to the ST and use another L-bracket?

you'd be surprised how sturdy zip ties can be esp at the brake bridge for this, I have done it on my inbred and taken it offroad, they dont move! At chainstay bridge I did zip ties too but with inner tube wrapped around the stays for more stability. Dont overthink it, just zip tie and ride into sunset.

I just used a standard P clip pointing upwards on that little bar with the two holes, then a long spacer and long bolt.