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I nicked the tip of the taper on a bottom bracket spindle. Is it still safe?
English vs Italian bottom bracket - chainline considerationsWhat went wrong with my bottom bracket spindle length calculation?How does pedaling power transfer to the bearings in Hollowtech II bottom bracket?What is my bottom bracket spindle length?Removing square taper bottom bracket cartridge after stripping notchesUnusual bottom bracket shellMinimum space between square taper crank and bottom bracketBroken bottom bracket?Tightening bottom bracket prevents crank spindle from turningLube new sealed bottom bracket (BB-UN55)
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I had to cut the crank arms off of a bike I'm working on. Used an angle grinder. Despite my efforts to avoid damaging the bottom bracket spindle, I nicked it in three places, all at the tip.
The bearings and surfaces are all dandy. Is it safe to use this with new crank arms?
This is the worst of the three.
safety bottom-bracket
edited 4 hours ago
Criggie♦
49.1k5 gold badges84 silver badges168 bronze badges
asked 8 hours ago
id est laborumid est laborum
3383 silver badges10 bronze badges
add a comment
|
I had to cut the crank arms off of a bike I'm working on. Used an angle grinder. Despite my efforts to avoid damaging the bottom bracket spindle, I nicked it in three places, all at the tip.
The bearings and surfaces are all dandy. Is it safe to use this with new crank arms?
This is the worst of the three.
safety bottom-bracket
edited 4 hours ago
Criggie♦
49.1k5 gold badges84 silver badges168 bronze badges
asked 8 hours ago
id est laborumid est laborum
3383 silver badges10 bronze badges
2
You should carefully file down any raised spots around your nicks, so that the new arms seat tightly and don't get hung up on anything.
– Daniel R Hicks
7 hours ago
Curious - what was wrong that you had to cut the crank arms off but the BB was reusable? Guessing the Extractor threads were stripped?
– Criggie♦
4 hours ago
@criggie yeah. I stripped them. I think a gorilla assembled this bike, and forgot the grease in a number of key areas
– id est laborum
4 hours ago
add a comment
|
I had to cut the crank arms off of a bike I'm working on. Used an angle grinder. Despite my efforts to avoid damaging the bottom bracket spindle, I nicked it in three places, all at the tip.
The bearings and surfaces are all dandy. Is it safe to use this with new crank arms?
This is the worst of the three.
safety bottom-bracket
edited 4 hours ago
Criggie♦
49.1k5 gold badges84 silver badges168 bronze badges
asked 8 hours ago
id est laborumid est laborum
3383 silver badges10 bronze badges
I had to cut the crank arms off of a bike I'm working on. Used an angle grinder. Despite my efforts to avoid damaging the bottom bracket spindle, I nicked it in three places, all at the tip.
The bearings and surfaces are all dandy. Is it safe to use this with new crank arms?
This is the worst of the three.
safety bottom-bracket
safety bottom-bracket
edited 4 hours ago
Criggie♦
49.1k5 gold badges84 silver badges168 bronze badges
asked 8 hours ago
id est laborumid est laborum
3383 silver badges10 bronze badges
edited 4 hours ago
Criggie♦
49.1k5 gold badges84 silver badges168 bronze badges
asked 8 hours ago
id est laborumid est laborum
3383 silver badges10 bronze badges
edited 4 hours ago
Criggie♦
49.1k5 gold badges84 silver badges168 bronze badges
edited 4 hours ago
Criggie♦
49.1k5 gold badges84 silver badges168 bronze badges
edited 4 hours ago
Criggie♦
49.1k5 gold badges84 silver badges168 bronze badges
49.1k5 gold badges84 silver badges168 bronze badges
asked 8 hours ago
id est laborumid est laborum
3383 silver badges10 bronze badges
asked 8 hours ago
id est laborumid est laborum
3383 silver badges10 bronze badges
asked 8 hours ago
id est laborumid est laborum
3383 silver badges10 bronze badges
3383 silver badges10 bronze badges
2
You should carefully file down any raised spots around your nicks, so that the new arms seat tightly and don't get hung up on anything.
– Daniel R Hicks
7 hours ago
Curious - what was wrong that you had to cut the crank arms off but the BB was reusable? Guessing the Extractor threads were stripped?
– Criggie♦
4 hours ago
@criggie yeah. I stripped them. I think a gorilla assembled this bike, and forgot the grease in a number of key areas
– id est laborum
4 hours ago
add a comment
|
2
You should carefully file down any raised spots around your nicks, so that the new arms seat tightly and don't get hung up on anything.
– Daniel R Hicks
7 hours ago
Curious - what was wrong that you had to cut the crank arms off but the BB was reusable? Guessing the Extractor threads were stripped?
– Criggie♦
4 hours ago
@criggie yeah. I stripped them. I think a gorilla assembled this bike, and forgot the grease in a number of key areas
– id est laborum
4 hours ago
2
2
You should carefully file down any raised spots around your nicks, so that the new arms seat tightly and don't get hung up on anything.
– Daniel R Hicks
7 hours ago
You should carefully file down any raised spots around your nicks, so that the new arms seat tightly and don't get hung up on anything.
– Daniel R Hicks
7 hours ago
Curious - what was wrong that you had to cut the crank arms off but the BB was reusable? Guessing the Extractor threads were stripped?
– Criggie♦
4 hours ago
Curious - what was wrong that you had to cut the crank arms off but the BB was reusable? Guessing the Extractor threads were stripped?
– Criggie♦
4 hours ago
@criggie yeah. I stripped them. I think a gorilla assembled this bike, and forgot the grease in a number of key areas
– id est laborum
4 hours ago
@criggie yeah. I stripped them. I think a gorilla assembled this bike, and forgot the grease in a number of key areas
– id est laborum
4 hours ago
add a comment
|
2 Answers
2
active
oldest
votes
I'd reuse that spindle. The tips bear the smallest load. A nick near the center of the spindle is more significant
answered 8 hours ago
MartinMartin
1465 bronze badges
add a comment
|
The percentage of the total area of the tapers that is damaged is very small, so you should be able to re-use the bottom bracket. However, cartridge bottom brackets are quite cheap, so if the bearings are showing wear I'd just replace it.
IF you do re-use it, you'll need to carefully file down any burrs raised by the angle grinder, those will prevent a new crank seating on the taper properly.
answered 7 hours ago
Argenti ApparatusArgenti Apparatus
47.6k3 gold badges49 silver badges111 bronze badges
add a comment
|
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2 Answers
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2 Answers
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I'd reuse that spindle. The tips bear the smallest load. A nick near the center of the spindle is more significant
answered 8 hours ago
MartinMartin
1465 bronze badges
add a comment
|
I'd reuse that spindle. The tips bear the smallest load. A nick near the center of the spindle is more significant
answered 8 hours ago
MartinMartin
1465 bronze badges
add a comment
|
I'd reuse that spindle. The tips bear the smallest load. A nick near the center of the spindle is more significant
answered 8 hours ago
MartinMartin
1465 bronze badges
I'd reuse that spindle. The tips bear the smallest load. A nick near the center of the spindle is more significant
answered 8 hours ago
MartinMartin
1465 bronze badges
edited 7 hours ago
answered 8 hours ago
MartinMartin
1465 bronze badges
answered 8 hours ago
MartinMartin
1465 bronze badges
answered 8 hours ago
MartinMartin
1465 bronze badges
1465 bronze badges
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add a comment
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The percentage of the total area of the tapers that is damaged is very small, so you should be able to re-use the bottom bracket. However, cartridge bottom brackets are quite cheap, so if the bearings are showing wear I'd just replace it.
IF you do re-use it, you'll need to carefully file down any burrs raised by the angle grinder, those will prevent a new crank seating on the taper properly.
answered 7 hours ago
Argenti ApparatusArgenti Apparatus
47.6k3 gold badges49 silver badges111 bronze badges
add a comment
|
The percentage of the total area of the tapers that is damaged is very small, so you should be able to re-use the bottom bracket. However, cartridge bottom brackets are quite cheap, so if the bearings are showing wear I'd just replace it.
IF you do re-use it, you'll need to carefully file down any burrs raised by the angle grinder, those will prevent a new crank seating on the taper properly.
answered 7 hours ago
Argenti ApparatusArgenti Apparatus
47.6k3 gold badges49 silver badges111 bronze badges
add a comment
|
The percentage of the total area of the tapers that is damaged is very small, so you should be able to re-use the bottom bracket. However, cartridge bottom brackets are quite cheap, so if the bearings are showing wear I'd just replace it.
IF you do re-use it, you'll need to carefully file down any burrs raised by the angle grinder, those will prevent a new crank seating on the taper properly.
answered 7 hours ago
Argenti ApparatusArgenti Apparatus
47.6k3 gold badges49 silver badges111 bronze badges
The percentage of the total area of the tapers that is damaged is very small, so you should be able to re-use the bottom bracket. However, cartridge bottom brackets are quite cheap, so if the bearings are showing wear I'd just replace it.
IF you do re-use it, you'll need to carefully file down any burrs raised by the angle grinder, those will prevent a new crank seating on the taper properly.
answered 7 hours ago
Argenti ApparatusArgenti Apparatus
47.6k3 gold badges49 silver badges111 bronze badges
answered 7 hours ago
Argenti ApparatusArgenti Apparatus
47.6k3 gold badges49 silver badges111 bronze badges
answered 7 hours ago
Argenti ApparatusArgenti Apparatus
47.6k3 gold badges49 silver badges111 bronze badges
answered 7 hours ago
Argenti ApparatusArgenti Apparatus
47.6k3 gold badges49 silver badges111 bronze badges
47.6k3 gold badges49 silver badges111 bronze badges
add a comment
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add a comment
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2
You should carefully file down any raised spots around your nicks, so that the new arms seat tightly and don't get hung up on anything.
– Daniel R Hicks
7 hours ago
Curious - what was wrong that you had to cut the crank arms off but the BB was reusable? Guessing the Extractor threads were stripped?
– Criggie♦
4 hours ago
@criggie yeah. I stripped them. I think a gorilla assembled this bike, and forgot the grease in a number of key areas
– id est laborum
4 hours ago