Roller Cam bottom mount rear brake?
02-02-23, 01:39 PM
#26
feros ferio
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Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
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Originally Posted by ClydeClydeson
I don't recall ever seeing chainstay mounted roller cam brakes - this (terrible) position was exclusively used with U brakes IIRC. The distance between the bottom bracket, under which the cable was routed, and the brake would generaly be too short for roller cams. I know this because the distance was damn near too short for U brakes, which are shorter than roller cams. In fact, if I correctly recall the under-BB-brake bikes I worked on BITD, unless U brakes are set up with an extremely short straddle cable, the cable yoke was always at risk of bottoming out against the cable guide. Roller cam brake arms are longer than U brake arms, and the 'cam' took up a lot more space than the yoke did on U brakes.
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
02-02-23, 01:53 PM
#27
blahblahblah chrome moly
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Originally Posted by ClydeClydeson
I don't recall ever seeing chainstay mounted roller cam brakes - this (terrible) position was exclusively used with U brakes IIRC. The distance between the bottom bracket, under which the cable was routed, and the brake would generaly be too short for roller cams. I know this because the distance was damn near too short for U brakes, which are shorter than roller cams. In fact, if I correctly recall the under-BB-brake bikes I worked on BITD, unless U brakes are set up with an extremely short straddle cable, the cable yoke was always at risk of bottoming out against the cable guide. Roller cam brake arms are longer than U brake arms, and the 'cam' took up a lot more space than the yoke did on U brakes.
Remember, early mass-produced MTBs had long chainstays.
Mark B
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02-02-23, 02:22 PM
#28
blahblahblah chrome moly
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Above is a frame made at UBI, by one of the instructors.
This one (link) is on the Flickr belonging to Black Mountain Cycles. It's a WTB brake, on a Steve Potts frame. BTW, don't shorten Black Mountain to "BMC", there's already a bike company by that name. With multiple Tour De France victories, so it's not like they're unknown!
Here's a great view of the WTB brake on another Potts, on Bike Radar. Go to image #6
This one above is on an Ibis. Poor focus but you can tell it's a WTB brake.
Finally I'll leave you with this Fisher with a Suntour rollercam under the chainstays, on Wombat. (Go to image #2)
Five examples should be enough to prove it's "a thing".
Mark B
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02-02-23, 04:04 PM
#29
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Originally Posted by ClydeClydeson
I don't recall ever seeing chainstay mounted roller cam brakes - this (terrible) position was exclusively used with U brakes IIRC. The distance between the bottom bracket, under which the cable was routed, and the brake would generaly be too short for roller cams. I know this because the distance was damn near too short for U brakes, which are shorter than roller cams. In fact, if I correctly recall the under-BB-brake bikes I worked on BITD, unless U brakes are set up with an extremely short straddle cable, the cable yoke was always at risk of bottoming out against the cable guide. Roller cam brake arms are longer than U brake arms, and the 'cam' took up a lot more space than the yoke did on U brakes.
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02-02-23, 04:15 PM
#30
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Originally Posted by RustyJames
Very Mark Twain-esque line. Good one…
In his Lettres Provinciales, the French philosopher and mathematician Blaise Pascal famously wrote: I would have written a shorter letter, but I did not have the time.
