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-   -   Wiring on fenders (https://www.bikeforums.net/classic-vintage/1224591-wiring-fenders.html)

Spellscape 02-26-21 08:20 AM

Wiring on fenders
 
Hi allWhat's that sticky thing used to lay light wire inside fender?
Any advice on what to use now for same thing?
https://cimg7.ibsrv.net/gimg/bikefor...238ca1d197.jpg

clubman 02-26-21 08:45 AM

Buy some quality foil tape, the waterproof type obviously. I've repaired broken mudguards from the inside with it. The good stuff usually has a blue plastic film that you peel off first.

scarlson 02-26-21 09:04 AM

I've used silicone RTV to seal and stick wires in fenders. I like Hondabond HT silicone because it cures to a higher hardness than the generic stuff, but it is overpriced.

francophile 02-26-21 03:10 PM

You may notice the metal rollover on the side with the sticky stuff has an opening just wide enough to slide a 16ga or smaller wire inside Some manufacturers simply crimped the edge of the channel every 3-6" to prevent it from popping back out and make it more serviceable.

Foil tape or a silicone bead could work, but I tend to follow the method I've typically seen used, with the periodic crimp. Let me see if I can find a pic of what I'm talking about.

francophile 02-26-21 03:24 PM

Here you go. From an early 70s Peugeot PX-8 fender with light provisions.

Folding out the rolled edge enough to tuck a wire into it, then crimping the rolled edge of the fender as shown at the arrows is more than enough to keep your wire safe. No sticky stuff, no tape, no adhesive or sealant required. Totally invisible from the outside when done correctly.

If it was good enough for the OEM, it's good enough for me.

https://cimg6.ibsrv.net/gimg/bikefor...cb155866ea.jpg

nlerner 02-26-21 03:40 PM

I've done both the glue method and the tape method; glue seemed to hold up better through winter commuting.

bertinjim 02-26-21 03:44 PM

Spellscape-

Francophile's tuck and crimp method works perfectly and leaves no residue to catch road debris and salt. It also maximizes the space between the tire and the fender and reduces the chance of a stone or such like jamming between them. I've used that method on two bikes and it is perfectly clean, elegant and serviceable with the advantage of being easily reversible, if ever necessary.

scarlson 02-26-21 04:11 PM

The problem I've had with crimping is that I sometimes nick the wire. Depends on how the beads on the edges of your fenders are done. Some are better than others when it comes to being friendly to wires. I've found VO fenders to be particularly bad in this regard, which is why I used silicone in the first place.

Spellscape 02-26-21 04:13 PM

I have this on 2 bikes. Both not only have this tar but also all use rim of fender as route. This one also had metal springs to fix wire. But anyway this thing was used too.
I Do not intend to use it in same messy way as "factory" sealing job for sure, just wanted to know all options.

francophile 02-26-21 04:20 PM


Originally Posted by scarlson (Post 21943132)
The problem I've had with crimping is that I sometimes nick the wire. Depends on how the beads on the edges of your fenders are done. Some are better than others when it comes to being friendly to wires. I've found VO fenders to be particularly bad in this regard, which is why I used silicone in the first place.

The crimp on the OEM fender above still has a gap between the rolled edge and the inside edge of the fender, maybe 1mm. If you're crimping metal-to-metal such that you're able to nick a wire or pierce the wire casing, you're crimping much farther than I've ever seen any OEM do.

While I've never had it happen myself and never tried this with a modern, aftermarket fender, I can think of a couple of potential workarounds: Crimp before running your cable, or alternately run some fishing line or similar pull cord through the groove, crimp, then tie your wire to the line and fish it through.

gugie 02-26-21 08:05 PM


Originally Posted by scarlson (Post 21943132)
The problem I've had with crimping is that I sometimes nick the wire. Depends on how the beads on the edges of your fenders are done. Some are better than others when it comes to being friendly to wires. I've found VO fenders to be particularly bad in this regard, which is why I used silicone in the first place.

The gap in the hem on VO fenders is smaller than Honjo's, so there's less room for wiring, but it can be done. Vintage Lefol's have an even bigger hem. @southpawboston is the wiring master, peruse his Flickr albums for great tips.

southpawboston 02-27-21 10:31 AM


Originally Posted by nlerner (Post 21943078)
I've done both the glue method and the tape method; glue seemed to hold up better through winter commuting.

I've never had good luck with tape, but I've had great luck with Goop brand adhesive. If the fender has tightly crimped edges (like VO), this is my go-to method. More recently I've taken to gluing 1" lengths of aluminum tubing (I get them from Blick Art) instead of gluing the wire itself, and running the wire through the conduits, so the wire can be replaced later on if needed. The Goop is so tenacious that sometimes I've been unable to remove the wire years later.

https://cimg6.ibsrv.net/gimg/bikefor...2bd5e559e4.jpg


Originally Posted by scarlson (Post 21943132)
The problem I've had with crimping is that I sometimes nick the wire. Depends on how the beads on the edges of your fenders are done. Some are better than others when it comes to being friendly to wires. I've found VO fenders to be particularly bad in this regard, which is why I used silicone in the first place.

Agreed, VO fender edges tend to be crimped pretty tight. Honjo's are generally nice and round and have plenty of room for wire. But for fenders with an open edge, crimping the edge after wiring to hold the wiring in place doesn't have to nick the wire, you can place little pieces of shrink tubing strategically along the wire where you want to crimp, to further protect the wire. I also do this wherever the wire enters or exits the rolled edge, where its not possible to place a normal grommet:

https://cimg5.ibsrv.net/gimg/bikefor...52ed3822f8.jpg

I also re-purpose electrical ring terminals as wire guides to help keep the wire tucked up under the fender where it has to cross over from the edge to the center, such as where it enters the taillight:

https://cimg4.ibsrv.net/gimg/bikefor...6d0c360bb5.jpg


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