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Perplexing knock from vintage steel bicycle

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Perplexing knock from vintage steel bicycle

Old 04-04-16, 10:30 PM
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Bikes: Rossin, Performance Campione, Ciocc, Colnago, Lejeune, Pinarello, Mizutani, Saavedra, BH

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Perplexing knock from vintage steel bicycle

My fix? Sprayed Tri-Flow on seat clamp bolt and rails where they connect to saddle last. Now, I'll back up and tell the story how I arrived at the solution. The set up is a 1985 Italian Columbus SL frame made by Biemmezeta but rebadged by a national chain store powerhouse and marketed as a frame only where one could pick from the parts bin. Cinelli stem and handlebars, Sugino 75 double crankset, Ritchey headset, Tektro dual pivot brakes swapped out for the original, beautiful, but poor performing Gran Compes. Shimano 600 tricolor derailleurs mated to Simplex SLJ shifters. LaPrade seat post securing a Prologo Kappa Pas saddle. Dura Ace front hub, SunTour Sprint rear hub, both laced to Mavic MA40's. About 3 weeks ago, a nagging knock started to occur only on climbs and out of the saddle between the 11 and 1 o'clock position of the drive side crank. First place I look is at the rear set up: the jockey wheels are starting to shred. OK, replace. Still knocks. OK, unscrew the freewheel, flush it and re-lube. While I'm in there I might as well repack the ball bearings. Uh-oh. Sealed (cartridge) bearings. Buy the last set of 6061 cartridge bearings in town. I can do this! No I can't. Need a special tool to remove and drive in new bearings. The nice young man Kevin at Global Bikes in Ahwatukee Arizona surgically slips off the plastic covering and regreases. He says bearings are good just need some grease which he applies (at no charge). Put it all back together. Still knocks.

By now, you are screaming, "CHECK THE CRANKPINS, MAN. THE CRANKPINS!!!" I follow your advice and find one that won't tighten. OK, replace (buy a bag just in case). Still knocks. I'm gonna have to tear down the bottom bracket. Still some grease but gritty. Find out the Sugino 75 crankset has a SunTour spindle (no big deal) but a head scratcher. Tear down the 53-40 chainwheeels and clean. Ah-ha!!!!!! discover a crankpin that's a bit short and may be the creaking culprit. I'm feeling confident and there's a lift in my step. I can't wait to get back on the road and puff out my chest in accomplishment..............................Still knocks. Am I going to have to disassemble the headset and the front hub too? A neophyte suggests I check the tension on the spokes while sagely commenting about "these modern wheels."

On the next ride I ask friends if they can pinpoint the knock. They can't. I'm disconsolate. I really don't want to take apart the headset and front hub, though they probably need it. I bid a friend goodnight and mention that I'm to spray lube the seat clamp bolt and rails and will see him tomorrow.

Do the 8 mile climb up South Mountain. NO KNOCK!!!!! All the while it was the seat creaking under torque while I was out of the saddle which explained why there was no noise while seated when sprinting. I hope this little story helps someone.

If one googles Performance Campione flashback Friday you'll find it in the 1985 Performance Bike catalog. Was also marketed as Palo Alto when imported by Palo Alto Bicycles. It's my go to steel ride even over the CIOCC and Colnago. Sorry, BikeForums says my photo is too large to upload - if anyone has any suggestions on that it would be appreciated)
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Old 04-04-16, 10:34 PM
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Do you also feel anything, or do you only hear a knock? I would check the fixed cup of the bottom bracket; it may be a bit loose.
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