Dirt Between Crank and Frame
08-12-20, 02:36 PM
#26
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Bikes: Trek Domane SLR 2019, Trek Trek Madone 5.1 (2011), Trek 1400 (1991)
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Having a 9 year old Madone, I've had to deal with some of the issues you've encountered. Here's what I would recommend;
1.) Remove DS crank arm/spindle. Park tools has a video on servicing press-fit cranks
2.) Clean everything off and inspect for excessive wear and damage.
3.) Spin the bearings with your finger, if they feel rough, replace them.
4.) Try removing the bearings with your fingers, if you can I would consider replacing the bearings with the oversize version. The squeal/creak may be bearings moving in the BB shell. The BB shell can become ovalised from repeated stress from pedaling. You can try using Loctite or VibraTite if you don't want to go down the oversize route. The oversize bearings are made for GXP BB's which have a larger spindle diameter than Shimano so you will need top hat bushings to compensate. This sounds sounds like a bit of a kludge, but I got 3 years of trouble free use so far.
1.) Remove DS crank arm/spindle. Park tools has a video on servicing press-fit cranks
2.) Clean everything off and inspect for excessive wear and damage.
3.) Spin the bearings with your finger, if they feel rough, replace them.
4.) Try removing the bearings with your fingers, if you can I would consider replacing the bearings with the oversize version. The squeal/creak may be bearings moving in the BB shell. The BB shell can become ovalised from repeated stress from pedaling. You can try using Loctite or VibraTite if you don't want to go down the oversize route. The oversize bearings are made for GXP BB's which have a larger spindle diameter than Shimano so you will need top hat bushings to compensate. This sounds sounds like a bit of a kludge, but I got 3 years of trouble free use so far.
08-14-20, 04:11 PM
#27
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Having a 9 year old Madone, I've had to deal with some of the issues you've encountered. Here's what I would recommend;
1.) Remove DS crank arm/spindle. Park tools has a video on servicing press-fit cranks
2.) Clean everything off and inspect for excessive wear and damage.
3.) Spin the bearings with your finger, if they feel rough, replace them.
4.) Try removing the bearings with your fingers, if you can I would consider replacing the bearings with the oversize version. The squeal/creak may be bearings moving in the BB shell. The BB shell can become ovalised from repeated stress from pedaling. You can try using Loctite or VibraTite if you don't want to go down the oversize route. The oversize bearings are made for GXP BB's which have a larger spindle diameter than Shimano so you will need top hat bushings to compensate. This sounds sounds like a bit of a kludge, but I got 3 years of trouble free use so far.
1.) Remove DS crank arm/spindle. Park tools has a video on servicing press-fit cranks
2.) Clean everything off and inspect for excessive wear and damage.
3.) Spin the bearings with your finger, if they feel rough, replace them.
4.) Try removing the bearings with your fingers, if you can I would consider replacing the bearings with the oversize version. The squeal/creak may be bearings moving in the BB shell. The BB shell can become ovalised from repeated stress from pedaling. You can try using Loctite or VibraTite if you don't want to go down the oversize route. The oversize bearings are made for GXP BB's which have a larger spindle diameter than Shimano so you will need top hat bushings to compensate. This sounds sounds like a bit of a kludge, but I got 3 years of trouble free use so far.
I will be replacing those bearings in the next few weeks. I already could feel they are rough just by turning the axle with the left crank arm removed. I guess I am going to have to find out how tight those bearings are before choosing the bearings to get....
I will let you know how this fix goes.
08-14-20, 04:26 PM
#28
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Bikes: Trek Domane SLR 2019, Trek Trek Madone 5.1 (2011), Trek 1400 (1991)
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Instead of viewing this as a kludge, I am inclined to consider this a carefully-designed solution to a difficult problem. It is not like we never throw any load onto that bottom bracket, which is made to be strong in compromise with weight. Tricky to work with. I thought of using bond, but I suspect that would not work as well as the solution you mentioned. Thank you for the warning on the inside diameter of the oversized bearings, I was not aware of that.
I will be replacing those bearings in the next few weeks. I already could feel they are rough just by turning the axle with the left crank arm removed. I guess I am going to have to find out how tight those bearings are before choosing the bearings to get....
I will let you know how this fix goes.
I will be replacing those bearings in the next few weeks. I already could feel they are rough just by turning the axle with the left crank arm removed. I guess I am going to have to find out how tight those bearings are before choosing the bearings to get....
I will let you know how this fix goes.
