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Old 07-14-11, 07:50 PM   #1
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Seat tube braze on for rear light

Does anyone here have one? Have did you do your wiring? The one's i've seen were either basically a water bottle braze on or a stud similar to a canti mount.


What I don't get is if the wiring is internal, how it works with the fact that the seat post might get in the way. I do know that the new Herse bikes use some sort of "carbon brush on stuff"

http://www.renehersebicycles.com/Chr...Randonneur.htm

I've got a 60's px-10 with Bilenky and he just called to tell me the other work I was having done is complete, so if I'm adding this I need to do it now. I need to sort out how it's going to work though.

here's the hearse bike btw

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Old 07-14-11, 08:06 PM   #2
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Have not seen this before - Interesting - Like the clean lines...
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Old 07-14-11, 08:07 PM   #3
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I don't have one, and as much as I like both dynamo lighting and internal wiring, I just don't see the need for a light at that location. Put a rear rack or a seat bag on your bike, and no one sees the light. Lights should be on the back of the fender. To that end, I can see the value of running a wire through the chain stay until it can get up into the fender.... or do what Anton did.
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Old 07-14-11, 08:13 PM   #4
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I don't have one, and as much as I like both dynamo lighting and internal wiring, I just don't see the need for a light at that location. Put a rear rack or a seat bag on your bike, and no one sees the light. Lights should be on the back of the fender. To that end, I can see the value of running a wire through the chain stay until it can get up into the fender.... or do what Anton did.
Well, it's a French design, and the French know the bags belong in the front.

I think the wiring runs through the BB and up the seat tube.
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Old 07-14-11, 08:15 PM   #5
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I don't have one, and as much as I like both dynamo lighting and internal wiring, I just don't see the need for a light at that location. Put a rear rack or a seat bag on your bike, and no one sees the light. Lights should be on the back of the fender. To that end, I can see the value of running a wire through the chain stay until it can get up into the fender.... or do what Anton did.
if its low enough you can still see the light fine with a smaller carradice bag or whatever, using one of those bagman supports. That said I would like to carry the bigger load in the front on this bike. I like to be able to grab stuff while i'm riding and I don't need large loads in the front and rear of this bike.
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Old 07-14-11, 08:16 PM   #6
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I think the wiring runs through the BB and up the seat tube.
right, it does, but the seat post is still in the way. unless you really have a short post. maybe that's how they do it?
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Old 07-14-11, 08:17 PM   #7
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Oh, you mean if the seatpost is inserted past the point where the light mount is brazed? Cut your seatpost.
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Old 07-14-11, 08:18 PM   #8
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Oh, you mean if the seatpost is inserted past the point where the light mount is brazed? Cut your seatpost.
Yeah, saves grams. Double bonus.
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Old 07-14-11, 08:21 PM   #9
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The seat post could be slotted to allow wiring /fitting clearance.
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Old 07-14-11, 08:26 PM   #10
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Yeah, saves grams. Double bonus.
stop quoting yourself.

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The seat post could be slotted to allow wiring /fitting clearance.
i thought about that. I'd probably forget it was like this and turn the saddle sideways when jamming the bike in my car and ruin the wiring.
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Old 07-14-11, 08:29 PM   #11
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Well, it's a French design, and the French know the bags belong in the front.

I think the wiring runs through the BB and up the seat tube.
Yes, down the seat tube, through the BB and up the down tube. It's always struck me as incongruous that English bikes, had excellent dynamo hubs but made no effort at internal wiring or mounting lights on the fenders (except the Raleigh RSW-16) while the French and Germans had beautiful lights and internal wiring and crappy sidewall dynamos.

I'm all for bags in the front, I just don't like limiting my options by putting something important like a headlight in a totally useless location.
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Old 07-14-11, 08:35 PM   #12
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Y

I'm all for bags in the front, I just don't like limiting my options by putting something important like a headlight in a totally useless location.
did you mean tailight?

I think i'll find it useful on this bike. If not then..
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Old 07-14-11, 08:36 PM   #13
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Yeah, saves grams. Double bonus.
I'm very quotable.
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Old 07-14-11, 08:37 PM   #14
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did you mean tailight?

I think i'll find it useful on this bike. If not then..
Besides the fact it looks awesome. Leave utility to the Brits and Germans.
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Old 07-14-11, 08:39 PM   #15
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I'm all for bags in the front, I just don't like limiting my options by putting something important like a headlight in a totally useless location.
Well, if it's not blocked, I don't think it's useless. If I had a light on my rear fender, I don't doubt I'd smash it in a couple weeks time. I've have bad luck banging my rear fenders on things.
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Old 07-14-11, 08:45 PM   #16
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Besides the fact it looks awesome. Leave utility to the Brits and Germans.
this bike will have at least as much utility as a De Rosa..

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Well, if it's not blocked, I don't think it's useless. If I had a light on my rear fender, I don't doubt I'd smash it in a couple weeks time. I've have bad luck banging my rear fenders on things.
that was exactly my thought. I want an integrated bike and I want it integrated in a way i dont have to worry about it every time i have to put it on a bike rack. Did you notice my Carlton's front fender was dented and falling off when I got to long island? By the time i got home i'd put a huge dent in my rear fender too when I was too tired and lazy when I finally got to my car Saturday night (Sunday morning really) and I threw it in the back seat instead of the rack.

A light woulda been a goner.
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Old 07-15-11, 07:12 AM   #17
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so no one has a light here?
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Old 07-15-11, 07:22 AM   #18
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Old 07-15-11, 07:38 AM   #19
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Put it on the underside of the non-drive-side chainstay. Out of the way, useful in most scenarios and it can be directly wired without messing w/seat tube. Also it gives you a large profile from the rear (no offense intended) so approaching traffic will see you easier and give you more room.
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Old 07-15-11, 08:28 AM   #20
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You know, this is starting to remind me of a conversation with my mom. You ask my opinion on X. I think it's a dumb idea, so I say so. But you like it, so you argue its merits. Okay, so why did you ask my opinion, again?

Hey Mom, I have changed my mind. I think a tail light on the seat tube, protected from the elements and the harmful rays of the headlights of passing cars, is a wonderful idea. I'm only miffed that I didn't think of it first!
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Old 07-15-11, 08:33 AM   #21
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Terraferma has done these before on his rando frames - all of them for internal routing. Most buyers simply cut their seatposts to clear.



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Old 07-15-11, 08:36 AM   #22
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heh

well to be fair, if you read my op i wasnt asking anyones opinion about location, just how the wiring was done.

I do appreciate the opinions though. I will be having the light put on the seat post if anyone cares.

What I was actually hoping to achieve with this thread was someone being able to talk a little bit about the "brushed" method that Herse uses to eliminate external wiring. that sounds neat.
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Old 07-15-11, 08:54 AM   #23
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How dare you start a conversation, on a public forum....stop wasting MY time with your half baked ideas.......
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Old 07-15-11, 09:06 AM   #24
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heh

well to be fair, if you read my op i wasnt asking anyones opinion about location, just how the wiring was done.

I do appreciate the opinions though. I will be having the light put on the seat post if anyone cares.

What I was actually hoping to achieve with this thread was someone being able to talk a little bit about the "brushed" method that Herse uses to eliminate external wiring. that sounds neat.
Fair enough.

Brushes conduct best when moved frequently or, better yet, when moving, like an electric motor. In a static situation it takes surprisingly little by way of dirt, oxidation, or whatever, to interfere with conduction. Metal brushes rely on their own springiness to maintain pressure to maintain conductivity; if pressure relaxes, conductivity is lost. Now, inside the seat tube it may well be so protected from the elements that you don't have this problem; I can only speculate. In my (long) experience with dynamo powered bicycle lighting, though, I have found that wiring problems are extremely difficult to diagnose. Either the light works, so you know you don't have a problem, or it doesn't, and you don't know what the problem is. So if it doesn't work, you have to start taking the thing apart and ckecking and re-doing every connection until it starts working again... which sometimes means destroying LEDs that may, or may no, be perfectly functional. As a result I have found the best way to have reliable lights is to assume Murphy's Law and eliminate every potential problem. Never use anything complicated where something simple will do. Switch? Not necessary. Capacitor? Nope. Fancy brush connections? Gimme break.
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Old 07-15-11, 09:16 AM   #25
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no no, not brushes, like you see on an old car alternator, "brush on" carbon. I think Herse is brushing something on the inside of the tubing or something that conducts electricity somehow. I don't know, that's what I was hoping to find out. I kinda doubt anyone here owns a bike with it though.

Agree though that keeping it simple in my experience is a good idea.
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