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2005 Bontrager crank w/ integrated bb to much drag?
My LBS was building an fairly high end 2005 Lemond today. The bike was
a mix of 105 & 04 ultegra. The crank w/ itegrated bb was a new bontrager. It was similar to the 04 d/a xtr & xt. The crankset looked very nice and the bb seemed smooth. The crank seemed to have a HUGE amount of DRAG. Is this a problem with these new external bearing designs? Maybe the LBS hasn't got around to adjusting it but as it sat something seemed amiss. |
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dianne_1234 wrote in message ... On 15 Aug 2004 13:04:03 -0700, (Evan Evans) wrote: My LBS was building an fairly high end 2005 Lemond today. The bike was a mix of 105 & 04 ultegra. The crank w/ itegrated bb was a new bontrager. It was similar to the 04 d/a xtr & xt. The crankset looked very nice and the bb seemed smooth. The crank seemed to have a HUGE amount of DRAG. Is this a problem with these new external bearing designs? Maybe the LBS hasn't got around to adjusting it but as it sat something seemed amiss. I've noticed a lot of modern bearings seem to have a lot of drag. Hubs, bottom brackets, headsets. Not like in the old days of loose ball bearings. That's because of the tight seals required to protect the cartridge bearings from contamination. On a bicycle it's a losing battle. The tiny amount of grease within a cartridge bearing is not generally designed for the conditions of high load and slow speed encountered on a bicycle. In addition, design of bearing units with cartridge bearings is compromised due to cost and restrictions of generally accepted size. It would not please the eye if the bicycle changed shape within a generation. So it wouldn't sell. The result is for a long time we will be forced to accept inferior bearings or much higher prices. Has not Campagnolo's ejector thread patent expired? If it has, it should be taken up on cheap traditional units to give all the protection required along with a centre oiling hole which all standard bikes had around WWII Balls should usually be held in a retainer to prevent them wearing agaist each other and so contaminating the lubricant. Oil is best used as a lubricant. I find 3in1 cycle oil perfectly adequate. It has extra protection by way of water dispersants and antioxidants. So if the oil's still around, it's still doing its job. Keep them wet. It's much easier to get going when adequately lubricated. Trevor |
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gevans- The crank w/ itegrated bb was a new
bontrager. It was similar to the 04 d/a xtr & xt. BRBR The crank seemed to have a HUGE amount of DRAG. Is this a problem with these new external bearing designs? Maybe the LBS hasn't got around to adjusting it but as it sat something seemed amiss. BRBR No adjustment possible and with all the seals that are in these things, they are smooth but 'sluggish', draggy. Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
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Campagnolo is looking better all the time : )
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Campagnolo is looking better all the time : )
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Campagnolo is looking better all the time : )
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