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1991 (I think) Trek 850 MTB bottom bracket replacement. Maybe similar to 830?
How do I measure a bottom bracket?Windsor - The Hour - Bottom Bracket DimensionsReplacing bottom bracket on 98 trek 820Need help identifying bottom bracketWhich bottom bracket do I need to replace crank on a Trek FX 7.1?Trouble removing bottom bracketTrek Emonda ALR bottom bracket dragBSA Bottom Bracket ReplacementBottom Bracket on a Trek CrossRip Comp 2016?Bottom bracket replacement
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I have a Trek 850 MTB that needs the bottom bracket replaced. Is there a standard size to order? If I take off the bike will there be a number that will help me order a new one or do I measure somehow? Thank you.
bottom-bracket
edited 3 hours ago
Argenti Apparatus
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I have a Trek 850 MTB that needs the bottom bracket replaced. Is there a standard size to order? If I take off the bike will there be a number that will help me order a new one or do I measure somehow? Thank you.
bottom-bracket
edited 3 hours ago
Argenti Apparatus
42.2k3 gold badges45 silver badges104 bronze badges
asked 8 hours ago
Mark HMark H
111 bronze badge
New contributor
Mark H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a Trek 850 MTB that needs the bottom bracket replaced. Is there a standard size to order? If I take off the bike will there be a number that will help me order a new one or do I measure somehow? Thank you.
bottom-bracket
edited 3 hours ago
Argenti Apparatus
42.2k3 gold badges45 silver badges104 bronze badges
asked 8 hours ago
Mark HMark H
111 bronze badge
New contributor
Mark H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a Trek 850 MTB that needs the bottom bracket replaced. Is there a standard size to order? If I take off the bike will there be a number that will help me order a new one or do I measure somehow? Thank you.
bottom-bracket
bottom-bracket
edited 3 hours ago
Argenti Apparatus
42.2k3 gold badges45 silver badges104 bronze badges
asked 8 hours ago
Mark HMark H
111 bronze badge
New contributor
Mark H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 3 hours ago
Argenti Apparatus
42.2k3 gold badges45 silver badges104 bronze badges
asked 8 hours ago
Mark HMark H
111 bronze badge
New contributor
Mark H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 3 hours ago
Argenti Apparatus
42.2k3 gold badges45 silver badges104 bronze badges
edited 3 hours ago
Argenti Apparatus
42.2k3 gold badges45 silver badges104 bronze badges
edited 3 hours ago
Argenti Apparatus
42.2k3 gold badges45 silver badges104 bronze badges
42.2k3 gold badges45 silver badges104 bronze badges
asked 8 hours ago
Mark HMark H
111 bronze badge
New contributor
Mark H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Mark HMark H
111 bronze badge
asked 8 hours ago
Mark HMark H
111 bronze badge
111 bronze badge
New contributor
Mark H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Mark H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
1 Answer
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Bicycle blue book says the 850 came with a BB-Lp26 bottom bracket, which was 68mm wide, 110mm spindle length, square taper. There are some new (old stock) on ebay, but I don't see why a newer BB-UN26 couldn't also be used (or any other standard ISO bottom bracket made for a 68mm wide shell, with a 110mm spindle).
I'd measure the BB shell and spindle width, just to make sure. Shell width is self-explanatory. You'll need to pull cranks to accurately measure the spindle width, and a caliper would be best. If you pull the BB, this info might be legible somewhere on the BB. I'd try pulling it before ordering a new one. Remember that the drive side has reverse thread, so clockwise to take it off. If it's from 1991, it may be seized pretty well. You may need to clamp a BB tool into a vise and use the entire bike frame as leverage to get it loose. I've had to do this in the past.
answered 8 hours ago
WPNoviceCoderWPNoviceCoder
4521 silver badge9 bronze badges
Thank you, will try and take it apart and see. Have tried some other rigid fork bikes and keep coming back to this one.
– Mark H
6 hours ago
Shimano cartridge bearing bottom brackets---and the handful of other company's copy-cats I've seen--have the model number, shell width and spindle length printed on a sticker in the middle of the cartridge.
– Jeff
2 hours ago
Also note the offset of the spindle can vary, so the same length spindle may move the chainline a few mm.One option is buy a BB from a LBS that allows you to return it for an different length spindle (or get a shop to do it). A few mm chain line change will make no difference, if anything go a bit longer rather than shorted spindle to ensure the chain clears the frame.
– mattnz
2 hours ago
add a comment |
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1 Answer
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Bicycle blue book says the 850 came with a BB-Lp26 bottom bracket, which was 68mm wide, 110mm spindle length, square taper. There are some new (old stock) on ebay, but I don't see why a newer BB-UN26 couldn't also be used (or any other standard ISO bottom bracket made for a 68mm wide shell, with a 110mm spindle).
I'd measure the BB shell and spindle width, just to make sure. Shell width is self-explanatory. You'll need to pull cranks to accurately measure the spindle width, and a caliper would be best. If you pull the BB, this info might be legible somewhere on the BB. I'd try pulling it before ordering a new one. Remember that the drive side has reverse thread, so clockwise to take it off. If it's from 1991, it may be seized pretty well. You may need to clamp a BB tool into a vise and use the entire bike frame as leverage to get it loose. I've had to do this in the past.
answered 8 hours ago
WPNoviceCoderWPNoviceCoder
4521 silver badge9 bronze badges
Thank you, will try and take it apart and see. Have tried some other rigid fork bikes and keep coming back to this one.
– Mark H
6 hours ago
Shimano cartridge bearing bottom brackets---and the handful of other company's copy-cats I've seen--have the model number, shell width and spindle length printed on a sticker in the middle of the cartridge.
– Jeff
2 hours ago
Also note the offset of the spindle can vary, so the same length spindle may move the chainline a few mm.One option is buy a BB from a LBS that allows you to return it for an different length spindle (or get a shop to do it). A few mm chain line change will make no difference, if anything go a bit longer rather than shorted spindle to ensure the chain clears the frame.
– mattnz
2 hours ago
add a comment |
Bicycle blue book says the 850 came with a BB-Lp26 bottom bracket, which was 68mm wide, 110mm spindle length, square taper. There are some new (old stock) on ebay, but I don't see why a newer BB-UN26 couldn't also be used (or any other standard ISO bottom bracket made for a 68mm wide shell, with a 110mm spindle).
I'd measure the BB shell and spindle width, just to make sure. Shell width is self-explanatory. You'll need to pull cranks to accurately measure the spindle width, and a caliper would be best. If you pull the BB, this info might be legible somewhere on the BB. I'd try pulling it before ordering a new one. Remember that the drive side has reverse thread, so clockwise to take it off. If it's from 1991, it may be seized pretty well. You may need to clamp a BB tool into a vise and use the entire bike frame as leverage to get it loose. I've had to do this in the past.
answered 8 hours ago
WPNoviceCoderWPNoviceCoder
4521 silver badge9 bronze badges
Thank you, will try and take it apart and see. Have tried some other rigid fork bikes and keep coming back to this one.
– Mark H
6 hours ago
Shimano cartridge bearing bottom brackets---and the handful of other company's copy-cats I've seen--have the model number, shell width and spindle length printed on a sticker in the middle of the cartridge.
– Jeff
2 hours ago
Also note the offset of the spindle can vary, so the same length spindle may move the chainline a few mm.One option is buy a BB from a LBS that allows you to return it for an different length spindle (or get a shop to do it). A few mm chain line change will make no difference, if anything go a bit longer rather than shorted spindle to ensure the chain clears the frame.
– mattnz
2 hours ago
add a comment |
Bicycle blue book says the 850 came with a BB-Lp26 bottom bracket, which was 68mm wide, 110mm spindle length, square taper. There are some new (old stock) on ebay, but I don't see why a newer BB-UN26 couldn't also be used (or any other standard ISO bottom bracket made for a 68mm wide shell, with a 110mm spindle).
I'd measure the BB shell and spindle width, just to make sure. Shell width is self-explanatory. You'll need to pull cranks to accurately measure the spindle width, and a caliper would be best. If you pull the BB, this info might be legible somewhere on the BB. I'd try pulling it before ordering a new one. Remember that the drive side has reverse thread, so clockwise to take it off. If it's from 1991, it may be seized pretty well. You may need to clamp a BB tool into a vise and use the entire bike frame as leverage to get it loose. I've had to do this in the past.
answered 8 hours ago
WPNoviceCoderWPNoviceCoder
4521 silver badge9 bronze badges
Bicycle blue book says the 850 came with a BB-Lp26 bottom bracket, which was 68mm wide, 110mm spindle length, square taper. There are some new (old stock) on ebay, but I don't see why a newer BB-UN26 couldn't also be used (or any other standard ISO bottom bracket made for a 68mm wide shell, with a 110mm spindle).
I'd measure the BB shell and spindle width, just to make sure. Shell width is self-explanatory. You'll need to pull cranks to accurately measure the spindle width, and a caliper would be best. If you pull the BB, this info might be legible somewhere on the BB. I'd try pulling it before ordering a new one. Remember that the drive side has reverse thread, so clockwise to take it off. If it's from 1991, it may be seized pretty well. You may need to clamp a BB tool into a vise and use the entire bike frame as leverage to get it loose. I've had to do this in the past.
answered 8 hours ago
WPNoviceCoderWPNoviceCoder
4521 silver badge9 bronze badges
answered 8 hours ago
WPNoviceCoderWPNoviceCoder
4521 silver badge9 bronze badges
answered 8 hours ago
WPNoviceCoderWPNoviceCoder
4521 silver badge9 bronze badges
answered 8 hours ago
WPNoviceCoderWPNoviceCoder
4521 silver badge9 bronze badges
4521 silver badge9 bronze badges
Thank you, will try and take it apart and see. Have tried some other rigid fork bikes and keep coming back to this one.
– Mark H
6 hours ago
Shimano cartridge bearing bottom brackets---and the handful of other company's copy-cats I've seen--have the model number, shell width and spindle length printed on a sticker in the middle of the cartridge.
– Jeff
2 hours ago
Also note the offset of the spindle can vary, so the same length spindle may move the chainline a few mm.One option is buy a BB from a LBS that allows you to return it for an different length spindle (or get a shop to do it). A few mm chain line change will make no difference, if anything go a bit longer rather than shorted spindle to ensure the chain clears the frame.
– mattnz
2 hours ago
add a comment |
Thank you, will try and take it apart and see. Have tried some other rigid fork bikes and keep coming back to this one.
– Mark H
6 hours ago
Shimano cartridge bearing bottom brackets---and the handful of other company's copy-cats I've seen--have the model number, shell width and spindle length printed on a sticker in the middle of the cartridge.
– Jeff
2 hours ago
Also note the offset of the spindle can vary, so the same length spindle may move the chainline a few mm.One option is buy a BB from a LBS that allows you to return it for an different length spindle (or get a shop to do it). A few mm chain line change will make no difference, if anything go a bit longer rather than shorted spindle to ensure the chain clears the frame.
– mattnz
2 hours ago
Thank you, will try and take it apart and see. Have tried some other rigid fork bikes and keep coming back to this one.
– Mark H
6 hours ago
Thank you, will try and take it apart and see. Have tried some other rigid fork bikes and keep coming back to this one.
– Mark H
6 hours ago
Shimano cartridge bearing bottom brackets---and the handful of other company's copy-cats I've seen--have the model number, shell width and spindle length printed on a sticker in the middle of the cartridge.
– Jeff
2 hours ago
Shimano cartridge bearing bottom brackets---and the handful of other company's copy-cats I've seen--have the model number, shell width and spindle length printed on a sticker in the middle of the cartridge.
– Jeff
2 hours ago
Also note the offset of the spindle can vary, so the same length spindle may move the chainline a few mm.One option is buy a BB from a LBS that allows you to return it for an different length spindle (or get a shop to do it). A few mm chain line change will make no difference, if anything go a bit longer rather than shorted spindle to ensure the chain clears the frame.
– mattnz
2 hours ago
Also note the offset of the spindle can vary, so the same length spindle may move the chainline a few mm.One option is buy a BB from a LBS that allows you to return it for an different length spindle (or get a shop to do it). A few mm chain line change will make no difference, if anything go a bit longer rather than shorted spindle to ensure the chain clears the frame.
– mattnz
2 hours ago
add a comment |
Mark H is a new contributor. Be nice, and check out our Code of Conduct.
Mark H is a new contributor. Be nice, and check out our Code of Conduct.
Mark H is a new contributor. Be nice, and check out our Code of Conduct.
Mark H is a new contributor. Be nice, and check out our Code of Conduct.
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