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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 05-07-14, 10:26 AM   #1
wearyourtruth
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vintage 27" cyclocross frame (questions)

hey folks,

i recently picked up a vintage steel cyclocross frame. it's made by Vagacini (of which i've found very little info online) and is branded "cyclo cross" on the top tube and has Reynolds 531 stickers on the frame and fork. these decals all appear to be original and i have little reason to believe that this wasn't built to be a cyclocross bike, probably in the 70's by the weight, lugs and fork crown.

the frame has cantilever brake bosses and definitely is built for 27" wheels, not 700. i have a nice set of wheels for it, but i can really only find 2 manufacturers that produce a knobby 27" tire. i tried searching for knobby 27" tubulars and found even less. even looking around for past ebay auctions revealed little, new or used.

i know cyclocross started loosely in the early 1900's, and that it became an official sanctioned event in the 50's. And i know it wasn't until the 80's (roughly) that manufacturers had made the full switch over to fully 700c bikes. So that means there had to be at least a couple decades that people were racing cyclocross, as an official sport (presumably with tires built for that purpose), on 27" wheels. is that a fair assumption? where did they all go?
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Old 05-07-14, 10:40 AM   #2
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Are you seeking clincher? (Just making sure)
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Old 05-07-14, 11:37 AM   #3
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i'd prefer clincher, but honestly i can go either way, but i've tried 3 different sets of canti's with a 700c wheel and none of them have enough adjustment to not hit the tire, making me feel that i have to go with a 27" wheel
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Old 05-07-14, 01:23 PM   #4
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Have you tried the Shimano Altus canti's? I used the Sunrace clones for a similar situation as yours. They weren't my first choice, but they had the necessary adjustment.

I recently discovered that standard v-brakes have enough adjustment range too.
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Old 05-07-14, 03:59 PM   #5
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the tubulars called 28" now are the rim radius 700c clincher tries to be interchangeable ,

OP, data offered is all kind of nebulous ... get out that metric tape measure..

what is the radius measured from the axle center to the brake post center , brazed on the frame.. ? 285mm on mine.

using the Mafac dimensions for a cantilever caliper [ I measured mine ] .. the frame boss post to the brake shoe post is 25mm ,

combining that should be the bead-seat diameter of the rim, roughly the center of the brake track .. 27"(630) would be 315mm ;

622/2 is 311, the 700c .. my roughly measured 285 + 25 =310mm

Last edited by fietsbob; 05-07-14 at 04:07 PM.
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