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Campy Ultra Torque Bearing Replacement
Hi all,
I have a 2008 Campagnolo Centaur UT CT crankset on my CX bike. I put about 7 K km on it on the road over the summer, then did several muddy/ wet cross races in the fall. I recently noticed that the right side bearing was siezed, probably because I put the bike away with water in the BB shell. I removed the crank, and pulled the bearings with a pulley/bearing extractor. I discarded the original, siezed bearings, and ordered replacement 6805 RS bearings from an online retailer. I received the repacement bearings and pressed them onto the crank half shafts. They appeared to be fully seated. When I installed the cranks and torqued the half shaft joint bolt, the bearings were obviously overloaded by axial preload, and the crank can did not turn freely. It seems to me that either: 1) the bearings are not fully seated on their races or 2) the replacement bearings are thicker than the original campy bearings. I am fairly certain that 1 is not the case-as I seated the bearings with as much force as I feel comfortable using. The bearings I installed measure 24.8 mm ID x 36.8 mm OD x 6.5 mm thick, using my calipers. Can anyone confirm the size of the original campy bearings? The bike frame BB was faced and chased before the initial crank installation, and the cranks spun freely at that time. Thank you for any insight or ideas, Jeremy |
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#2
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Campy Ultra Torque Bearing Replacement
On 10 feb, 01:21, wrote:
Hi all, I have a 2008 Campagnolo Centaur UT CT crankset on my CX bike. * I put about 7 K km on it on the road over the summer, then did several muddy/ wet cross races in the fall. * I recently noticed that the right side bearing was siezed, probably because I put the bike away with water in the BB shell. I removed the crank, and pulled the bearings with a pulley/bearing extractor. * I discarded the original, siezed bearings, and ordered replacement 6805 RS bearings from an online retailer. * I received the repacement bearings and pressed them onto the crank half shafts. They appeared to be fully seated. * *When I installed the cranks and torqued the half shaft joint bolt, the bearings were obviously overloaded by axial preload, and the crank can did not turn freely. It seems to me that either: 1) the bearings are not fully seated on their races or 2) the replacement bearings are thicker than the original campy bearings. I am fairly certain that 1 is not the case-as I seated the bearings with as much force as I feel comfortable using. * *The bearings I installed measure 24.8 mm ID x 36.8 mm OD x 6.5 mm thick, using my calipers. I think you ought to get a new caliper. The ID/OD is 25/37 mm and I think you need the smaller sized 6805 bearing which are 6 mm wide instead of 7 mm. Wavy washer, seales in the right place? Can anyone confirm the size of the original campy bearings? *The bike frame BB was faced and chased before the initial crank installation, and the cranks spun freely at that time. How wide is the BB shell? Lou |
#3
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Campy Ultra Torque Bearing Replacement
On Feb 9, 5:21*pm, wrote:
Hi all, I have a 2008 Campagnolo Centaur UT CT crankset on my CX bike. * I put about 7 K km on it on the road over the summer, then did several muddy/ wet cross races in the fall. * I recently noticed that the right side bearing was siezed, probably because I put the bike away with water in the BB shell. I removed the crank, and pulled the bearings with a pulley/bearing extractor. * I discarded the original, siezed bearings, and ordered replacement 6805 RS bearings from an online retailer. * I received the repacement bearings and pressed them onto the crank half shafts. They appeared to be fully seated. * *When I installed the cranks and torqued the half shaft joint bolt, the bearings were obviously overloaded by axial preload, and the crank can did not turn freely. It seems to me that either: 1) the bearings are not fully seated on their races or 2) the replacement bearings are thicker than the original campy bearings. I am fairly certain that 1 is not the case-as I seated the bearings with as much force as I feel comfortable using. * *The bearings I installed measure 24.8 mm ID x 36.8 mm OD x 6.5 mm thick, using my calipers. Can anyone confirm the size of the original campy bearings? *The bike frame BB was faced and chased before the initial crank installation, and the cranks spun freely at that time. Thank you for any insight or ideas, Jeremy Like the other guy mentioned, you need 6mm width bearings. Not 7mm (which is what standard 6805 bearings are). I have Campag bearings, 6mm, expensive tho, call if you wish to order them. make sure you use the c clip on the RH bearing as well. If you cannot get the clip on...cuz they are not 6mm. vecchios.com |
#4
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Campy Ultra Torque Bearing Replacement
Like the other guy mentioned, you need 6mm width bearings. Not 7mm (which is what standard 6805 bearings are). I have Campag bearings, 6mm, expensive tho, call if you wish to order them. make sure you use the c clip on the RH bearing as well. If you cannot get the clip on...cuz they are not 6mm. Ok. Thanks for clearing that up. I wasn't aware that there were two thicknesses of 6805 bearing-the ones I bought (all six of them!) are too thick. Do I have to use "campagnolo" bearings, or is there another option? I'm really starting to regret buying this crank.... |
#5
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Campy Ultra Torque Bearing Replacement
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#6
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Campy Ultra Torque Bearing Replacement
On Feb 10, 10:33*am, wrote:
Like the other guy mentioned, you need 6mm width bearings. Not 7mm (which is what standard 6805 bearings are). I have Campag bearings, 6mm, expensive tho, call if you wish to order them. make sure you use the c clip on the RH bearing as well. If you cannot get the clip on...cuz they are not 6mm. Ok. * Thanks for clearing that up. * I wasn't aware that there were two thicknesses of 6805 bearing-the ones I bought (all six of them!) are too thick. * Do I have to use "campagnolo" bearings, or is there another option? * *I'm really starting to regret buying this crank..... http://store.bikebearing.com/shared/...product s.asp http://www.wheelsmfg.com/index.php?o...77&Item id=31 http://www.wheelsmfg.com/index.php?o...78&Item id=31 http://www.vxb.com/page/bearings/PROD/25mm/Kit7850 http://www.vxb.com/page/bearings/PROD/25mm/Kit7758 http://elitecycling.com/page.cfm?Pag...ils&sku=BB1685 http://www.bikeman.com/BB1685.html?u...ign=GoogleBase http://www.bocabearings.com/main1.as.../C3_#5_UDL/SRL http://fairwheelbikes.com/hsc-cerami...ng-p-1044.html http://www.ebikestop.com/ceramic_gra...x6-BB1685..php http://www.superflycycles.com/servlet/-strse-285/Detail $26.70. Cheapest of the links. |
#7
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Campy Ultra Torque Bearing Replacement
On Feb 10, 9:33*am, wrote:
Like the other guy mentioned, you need 6mm width bearings. Not 7mm (which is what standard 6805 bearings are). I have Campag bearings, 6mm, expensive tho, call if you wish to order them. make sure you use the c clip on the RH bearing as well. If you cannot get the clip on...cuz they are not 6mm. Ok. * Thanks for clearing that up. * I wasn't aware that there were two thicknesses of 6805 bearing-the ones I bought (all six of them!) are too thick. * Do I have to use "campagnolo" bearings, or is there another option? * *I'm really starting to regret buying this crank..... You aren't the first guy to think that all bearings of this ID and OD are the same width also. 7900 BB bearings are 6mm as well, for info. The last gent posted the places where these are available. We have Campagnolo ones.... |
#8
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Campy Ultra Torque Bearing Replacement
The last gent posted the places where these are available. We have Campagnolo ones.... Thanks to everyone who responded. How much are the campag steel bearings, Peter? I'm not sure I want ceramic bearings, regardless of cost, and all the 6mm bearings I can find online are ceramic, or ceramic hybrid. |
#9
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Campy Ultra Torque Bearing Replacement
On Feb 11, 10:59*am, wrote:
The last gent posted the places where these are available. We have Campagnolo ones.... Thanks to everyone who responded. How much are the campag steel bearings, Peter? *I'm not sure I want ceramic bearings, regardless of cost, and all the 6mm bearings I can find online are ceramic, or ceramic hybrid. $25 per, Campagnolo bearings(from Campag). I agree that ceramic are not worth the $, unless they are $25 per but if they are that inexpensive, I would wonder about their quality. There are crappy ceramic bearings as well. |
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