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 Post subject: FSA Direct mount brakes
PostPosted: Fri Mar 20, 2015 9:27 pm 
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Posts: 284
As a late adopter of chain stay mounted brakes, I've noted that lots of these set ups have pad rub, presumably from bottom bracket deflection when riding out of the saddle. I'm sure nearly everyone saw the prototype FSA brake from the Euro bike shows. Well, it's nearly in production, and someone was kind enough to send me a pic of the brake installed on a Madone fork. I don't know what tire that is, but judging by the tread it has to be at least a 25c, maybe even a 28c.

I'm excited by this brake because I think it could solve the pad rub problem by allowing you to keep the pads well away from the rim, while also allowing reasonable braking power using variable leverage, which is harder to design into a standard caliper brake. I know prior delta brakes have suffered from poor stopping power (Modolo, Campy, weinmann), but I had great success with a Suntour roller cam back in the day. As long as FSA has minimized friction with good bearings, built the caliper arms stiff, and provided good cable geometry, this could work well.

No affiliation with FSA, just excited to get rid of the crapolla Bontragers!


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PostPosted: Fri Mar 20, 2015 9:31 pm 
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"Late adopter"?? [emoji4]

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Posted: Fri Mar 20, 2015 9:31 pm 


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PostPosted: Sat Mar 21, 2015 12:58 pm 
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Location: United Kingdom of Great Britain and Northern Ireland
spud wrote:
As a late adopter of chain stay mounted brakes, ...


Was riding with chainstay mounted rear brake probably a long time before you were born. Then someone had the idea of moving them to the seatstays.


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PostPosted: Sat Mar 21, 2015 1:17 pm 
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old skool GT mtbs anyone?

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PostPosted: Sat Mar 21, 2015 1:40 pm 
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Location: Toronto
I noted the knock against Campy Delta brakes.

There are a lot of generalizations and misinformation around about this. The original Delta designs indeed had poor stopping power - more like a "speed reduction system".

Campy discontinued them and they went through a complete redesign, known as the "5-pivot" Delta. These are extremely powerful. I have used both types.

Although beautiful they were rather heavy and perhaps over-designed.

early versions:

Image

Image

Late 5 pivot version

Image

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PostPosted: Sat Mar 21, 2015 4:23 pm 
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I used mine for anchors of a small fishing vessel.

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PostPosted: Sat Mar 21, 2015 6:50 pm 
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I raced mtbs back in the late 80s, and went through the chain stay mounted brake/mud clearance issue. Built a custom mtb with seat stay mounted roller cam, and it worked a treat. I just had to stay on top of pad wear (which happened quickly) due to space constraints, but it was no big deal.

Problem with the Campy is that by necessity, the linkages were short, which meant they went through heavy angular displacement during actuation. Which also meant that pad wear could rapidly take you out of the peak leverage zone into the "oh shit I have no brakes" zone when you least needed it.

The wedge activated roller cam set up should be more tolerant of sub optimal set-up, but they will require a little more attention than a standard caliper, likely by adding washers under the brake shoe to tune pad placement. But the pad clearance you can run using a progressive cam should solve the pad rub problem. It would be nice not having to screw with the quick release prior to sprinting.


Last edited by spud on Sat Mar 21, 2015 6:53 pm, edited 1 time in total.

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PostPosted: Sat Mar 21, 2015 6:50 pm 
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I think Campagnolo designed the Delta's on the Shimano 600AX, which I rode.

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Posted: Sat Mar 21, 2015 6:50 pm 


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PostPosted: Mon Mar 23, 2015 3:59 pm 
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If history is any indication, the Shimano DA and EE Brakes versions will be what you want mounted on your bike for direct mount road calipers.


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