Drill brake bridge for fender?

[ted]

Sometimes rear brake bridges have a threaded hole on the bottom for attaching a fender.

My AHH brake bridge has a squarish section in the center that is flat where a fender bolt might go.

Would just drilling and taping that face work or should something like a water bottle mount be brazed in if I want to bolt a fender directly to the bridge?

Anybody know?

[Bill Lindsay]

Drilling and tapping would work if you do it right.  I have bikes that came with threaded bridges, and I prefer that.  My Hilsen, like yours, doesn't have a threaded rear brake bridge.  I have not drilled and tapped it yet, but it's currently not wearing fenders, either.   

[Chris Chen]

It would probably work, but you don't have a whole lot of space there, unless you're not going to run a brake bolt perpendicular to it :)

I might do something similar with my Hilsen but I'm going canti:

https://www.flickr.com/photos/lumachrome/16054437952/

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[ted]

Thanks Bill,

Since its basically flat sided in the middle I figure it wouldn't be hard to carefully mark and center-punch it so a drill wouldn't tend to walk.

Then just poke the right size hole with a hand drill and run the tap I use to clean bottle and rack mount threads through it.

Not trivial, but not too difficult either.

My SImpleOne has a threaded bridge and I like that better than the metal sliding crimping thing that comes with the longboards.

[Bill Lindsay]

Alternatively, Honjo L-brackets are really nice looking.  I also bought a set of Sheldon nuts for the next time fenders go back on the Hilsen.  Christopher is right that you'll have to run a bolt that's exactly the right length.  

[ted]

An L bracket would be another nice approach, particularly with the Sheldon nuts.

I have cut bolts to fit before, though probably not that short.

I was just putting longboards over soma GR tires on my Hilsen. There is not much room and the 45 fenders are barely wider than the tires. I think getting the fender in just the right place would be easier with a threaded bridge than with the other methods.

Of course if they work ok the way they are now I'm not gonna be in a big hurry to mess with it.

[Takashi]

Honjo makes this small thing that lets you mount rear fender on a bike without threaded rear brake bridge:
http://www.euroasiaimports.com/productcart/pc/Honjo-Fender-Attatchment-Pivot-for-Narrow-Space-2291p23812.htm

Takashi


2014年12月20日土曜日 8時21分31秒 UTC+9 ted:

[ted]

Thanks Takashi, that looks kinda neat.

I gather it replaces the spacer that normally goes on the brake bolt on the back side of the bridge. Do you know how thick it is?

I suspect the only way to get one would be special order through a LBS. 

[jeffrey kane]

You can avoid the special order issue by substituting a typical fender draruma  (eyelet bolt) for the same purpose. Granted, that Honjo piece is not only nice looking but (somewhat) better designed as a block to act as a spacer -- but I've used this method of repurposing the fender hardware piece with no problem whatsoever. 

I've also used the Honjo "L" brackets -- they look nice but are too fussy in my mind. Particularly with having to drill two holes into the fender and then loosing a little precious vertical space to the two bolt heads as they bump up against the brake bolt. The daruma/eyelet idea at least lets you snug the fender up as tight to the bridge as possible, anyway.

[Takashi]

ted,
I haven't seen it in person (Honjo products are hard to find even in Japan), but I found the following website:
https://www.cyclo.co.jp/webshop/shop.cgi?pw=&category=40-4

2nd photo from the top shows the hardware.
It says
horizontal hole (for brake) : 6mm
threaded hole (for fender) : 5mm
thickness : 8mm
height : 14mm


jeffrey,
That's a clever idea!


Takashi


2014年12月20日土曜日 21時36分33秒 UTC+9 jeffrey kane:

[Dan McNamara]

I may have something similar. I'll dig through the parts tomorrow and let you know. 

Dan

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[Anton Tutter]

Another solution is this little French widget.  I got a bunch of these and offered them up on the Bob and RBW lists a couple of years ago. I only have one left, in anticipation of me being in this situation one day, otherwise I'd offer it up:

It's designed for mounting a fender to a typical tubular brake bridge (without the modern Square center section).  If you were able to source one of these, you could file the curved recess flat to fit the square section of the bridge.  Or if you know someone with a lathe, this could be a really fast and easy widget to make.

Anton

[lungimsam]

I am kind of surprised all of Rivendell's bike models don't have a tapped fender mount on the brake bridge, stock, like the 2013 Hillbornes do.

RBW is into fenders. So I would have thought that would be standard on all their frames, but they are not.

[Leslie]

Well, they've become standard, but, weren't so originally... I think that's more to how late of a frame it is, or early....

[James Warren]

Or perhaps, how much of an Atlantis it is! :-)

Interestingly enough, my 2001 Atlantis does have the tapped fender mount on the rear brake bridge facing down. I wonder if it's been the standard on all Atlanti 2. (That would make sense for the most versatile of all Rivs.)

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- 700x55

[Peter Adler]

That looks ideal. On the offchance that you keep track of older purchases: Do you recall what the widget's French name is? I'm assuming it was a common part, but only in France (for perma-mounting fenders on 700c frames without predrilled brake bridges, perhaps). But given the current run of listings on eBay.fr, I'm guessing that anyone who's selling these has no idea what they are, so it'll be hard to ferret out.

Peter Adler

who wishes he had one of these right now to get a rear fender on before Stormageddon II: Apocalypse of the Drought-Stricken hits in

Berkeley, CA/USA

On Saturday, December 20, 2014 7:08:11 AM UTC-8, Anton Tutter wrote:

Another solution is this little French widget.  I got a bunch of these and offered them up on the Bob and RBW lists a couple of years ago. I only have one left, in anticipation of me being in this situation one day, otherwise I'd offer it up:

[Dan McNamara]

I finally had time to go through the parts and I have two of those widgets from Anton. The frames they were intended for have moved on so they are available if the OP and Peter are interested. 

Dan

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[ted]

Dan,

Although I appreciate your offer, I am satisfied with the way I currently have my fender mounted (with a sliding thing). Also my brake bridge is square in the middle, and it seems like a shame to butcher such a neat widget by filing it flat. I suppose someone could use half a piece of rod to fill the cut out, but probably using it on a round bridge (as intended) would be most satisfying. Peter certainly did sound excited about locating one, so perhaps he will take you up on it.

thnks

Ted

[Dan McNamara]

Thanks for the reply Ted. 

Peter - I work in Emeryville and live in San Rafael so if you are interested we can figure out a place to meet.

Dan

[Peter Adler]

Owtstanding. I'm in West Berkeley, but I head south into the Emeryville-to-Jack London region several times a week. Email me at <adl...@mac.com> and we'll work out a time window and a price. I may even have use for two - one for my Raleigh International loaded-ish touring beater, and one for a SuperCourse 650b conversion I should finish.

I've got the Honjo slidy bridges (Hiroshi-san at Jitensha not only had the correct bridge for the Le Paon clone, but had it in multiple widths), but this seems like a far more solid and discreet attachment.

Peter

[Clayton.sf]

I have one of those thingies for you if you send me your mailing address.