What type of crank fitting is this?
I have an old road bike I want to get a single speed crank for but don't know what fitting the bottom bracket has.
crankset bottom-bracket
asked Dec 11 at 10:26
Andy Stannard
2156
add a comment |
I have an old road bike I want to get a single speed crank for but don't know what fitting the bottom bracket has.
crankset bottom-bracket
asked Dec 11 at 10:26
Andy Stannard
2156
2
That's what's known as a "normal, everyday crank" .. in 1960.
– Daniel R Hicks
Dec 11 at 13:14
add a comment |
I have an old road bike I want to get a single speed crank for but don't know what fitting the bottom bracket has.
crankset bottom-bracket
asked Dec 11 at 10:26
Andy Stannard
2156
I have an old road bike I want to get a single speed crank for but don't know what fitting the bottom bracket has.
crankset bottom-bracket
crankset bottom-bracket
asked Dec 11 at 10:26
Andy Stannard
2156
asked Dec 11 at 10:26
Andy Stannard
2156
asked Dec 11 at 10:26
Andy Stannard
2156
asked Dec 11 at 10:26
Andy Stannard
2156
asked Dec 11 at 10:26
Andy Stannard
2156
2156
2
That's what's known as a "normal, everyday crank" .. in 1960.
– Daniel R Hicks
Dec 11 at 13:14
add a comment |
2
That's what's known as a "normal, everyday crank" .. in 1960.
– Daniel R Hicks
Dec 11 at 13:14
2
2
That's what's known as a "normal, everyday crank" .. in 1960.
– Daniel R Hicks
Dec 11 at 13:14
That's what's known as a "normal, everyday crank" .. in 1960.
– Daniel R Hicks
Dec 11 at 13:14
add a comment |
2 Answers
2
active
oldest
votes
The bottom bracket spindle is for cottered crank.
The bottom bracket looks like threaded one, so it is likely that it can be replaced with square taper or external cup bottom bracket. To tell which thread the bottom bracket has, we'd need to know the exact dimensions.
answered Dec 11 at 11:09
ojs
11.4k22141
3
Also, if the bottom bracket standard turns out to be obsolete, it might still be possible to only replace the axle with a square taper one.
– Walto Salonen
Dec 11 at 16:29
2
Here's a crib sheet for threaded bottom-bracket standards. In order of likelihood, it's probably British, then Italian, then French (unless it's a French bike).
– Adam Rice
Dec 11 at 18:07
Thanks for the advice! I've ordered a couple of suitable tools for removing it and will see if I can replace with a sealed cartridge or just replace the axel. Getting a knackered old bike as a project is a great way to learn about bike maintence etc, although a £25 bike quickly turns into a lot more with tools and bikes it's still a great investment in terms of learning and keeping myself entertained.
– Andy Stannard
Dec 13 at 10:38
add a comment |
As ojs says, you have a spindle for cottered cranks. Cottered cranks basically do not exist anymore, unless you look for 'vintage' parts. To fit a new single speed crank you need to replace the bottom bracket bearings and axle along with the crank.
Your bottom bracket shell is am internally threaded kind. The most commonly encountered standard for thread width and pitch is known as 'English' or 'BSA'. On an older bike this may not be the case.
If your bike is English threaded there are lots of options available. Probably the best option is a threaded internal cartridge BB bearing with square taper or splined crank interface. Square taper single speed cranks are plentiful and inexpensive. This also allows you to choose the spindle length to get the chainline you need.
If you can get the old bearings out and ca get hold of an old English threaded BB you could try it for size. I say this a bit hesitantly though because I have a feeling there are some threadings that are close to but not exactly the English standard.
Update: Sheldon Browns page on threaded BB shells for reference: https://www.sheldonbrown.com/cribsheet-bottombrackets.html
answered Dec 11 at 16:41
Argenti Apparatus
32.3k23481
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The bottom bracket spindle is for cottered crank.
The bottom bracket looks like threaded one, so it is likely that it can be replaced with square taper or external cup bottom bracket. To tell which thread the bottom bracket has, we'd need to know the exact dimensions.
answered Dec 11 at 11:09
ojs
11.4k22141
3
Also, if the bottom bracket standard turns out to be obsolete, it might still be possible to only replace the axle with a square taper one.
– Walto Salonen
Dec 11 at 16:29
2
Here's a crib sheet for threaded bottom-bracket standards. In order of likelihood, it's probably British, then Italian, then French (unless it's a French bike).
– Adam Rice
Dec 11 at 18:07
Thanks for the advice! I've ordered a couple of suitable tools for removing it and will see if I can replace with a sealed cartridge or just replace the axel. Getting a knackered old bike as a project is a great way to learn about bike maintence etc, although a £25 bike quickly turns into a lot more with tools and bikes it's still a great investment in terms of learning and keeping myself entertained.
– Andy Stannard
Dec 13 at 10:38
add a comment |
The bottom bracket spindle is for cottered crank.
The bottom bracket looks like threaded one, so it is likely that it can be replaced with square taper or external cup bottom bracket. To tell which thread the bottom bracket has, we'd need to know the exact dimensions.
answered Dec 11 at 11:09
ojs
11.4k22141
3
Also, if the bottom bracket standard turns out to be obsolete, it might still be possible to only replace the axle with a square taper one.
– Walto Salonen
Dec 11 at 16:29
2
Here's a crib sheet for threaded bottom-bracket standards. In order of likelihood, it's probably British, then Italian, then French (unless it's a French bike).
– Adam Rice
Dec 11 at 18:07
Thanks for the advice! I've ordered a couple of suitable tools for removing it and will see if I can replace with a sealed cartridge or just replace the axel. Getting a knackered old bike as a project is a great way to learn about bike maintence etc, although a £25 bike quickly turns into a lot more with tools and bikes it's still a great investment in terms of learning and keeping myself entertained.
– Andy Stannard
Dec 13 at 10:38
add a comment |
The bottom bracket spindle is for cottered crank.
The bottom bracket looks like threaded one, so it is likely that it can be replaced with square taper or external cup bottom bracket. To tell which thread the bottom bracket has, we'd need to know the exact dimensions.
answered Dec 11 at 11:09
ojs
11.4k22141
The bottom bracket spindle is for cottered crank.
The bottom bracket looks like threaded one, so it is likely that it can be replaced with square taper or external cup bottom bracket. To tell which thread the bottom bracket has, we'd need to know the exact dimensions.
answered Dec 11 at 11:09
ojs
11.4k22141
answered Dec 11 at 11:09
ojs
11.4k22141
answered Dec 11 at 11:09
ojs
11.4k22141
answered Dec 11 at 11:09
ojs
11.4k22141
11.4k22141
3
Also, if the bottom bracket standard turns out to be obsolete, it might still be possible to only replace the axle with a square taper one.
– Walto Salonen
Dec 11 at 16:29
2
Here's a crib sheet for threaded bottom-bracket standards. In order of likelihood, it's probably British, then Italian, then French (unless it's a French bike).
– Adam Rice
Dec 11 at 18:07
Thanks for the advice! I've ordered a couple of suitable tools for removing it and will see if I can replace with a sealed cartridge or just replace the axel. Getting a knackered old bike as a project is a great way to learn about bike maintence etc, although a £25 bike quickly turns into a lot more with tools and bikes it's still a great investment in terms of learning and keeping myself entertained.
– Andy Stannard
Dec 13 at 10:38
add a comment |
3
Also, if the bottom bracket standard turns out to be obsolete, it might still be possible to only replace the axle with a square taper one.
– Walto Salonen
Dec 11 at 16:29
2
Here's a crib sheet for threaded bottom-bracket standards. In order of likelihood, it's probably British, then Italian, then French (unless it's a French bike).
– Adam Rice
Dec 11 at 18:07
Thanks for the advice! I've ordered a couple of suitable tools for removing it and will see if I can replace with a sealed cartridge or just replace the axel. Getting a knackered old bike as a project is a great way to learn about bike maintence etc, although a £25 bike quickly turns into a lot more with tools and bikes it's still a great investment in terms of learning and keeping myself entertained.
– Andy Stannard
Dec 13 at 10:38
3
3
Also, if the bottom bracket standard turns out to be obsolete, it might still be possible to only replace the axle with a square taper one.
– Walto Salonen
Dec 11 at 16:29
Also, if the bottom bracket standard turns out to be obsolete, it might still be possible to only replace the axle with a square taper one.
– Walto Salonen
Dec 11 at 16:29
2
2
Here's a crib sheet for threaded bottom-bracket standards. In order of likelihood, it's probably British, then Italian, then French (unless it's a French bike).
– Adam Rice
Dec 11 at 18:07
Here's a crib sheet for threaded bottom-bracket standards. In order of likelihood, it's probably British, then Italian, then French (unless it's a French bike).
– Adam Rice
Dec 11 at 18:07
Thanks for the advice! I've ordered a couple of suitable tools for removing it and will see if I can replace with a sealed cartridge or just replace the axel. Getting a knackered old bike as a project is a great way to learn about bike maintence etc, although a £25 bike quickly turns into a lot more with tools and bikes it's still a great investment in terms of learning and keeping myself entertained.
– Andy Stannard
Dec 13 at 10:38
Thanks for the advice! I've ordered a couple of suitable tools for removing it and will see if I can replace with a sealed cartridge or just replace the axel. Getting a knackered old bike as a project is a great way to learn about bike maintence etc, although a £25 bike quickly turns into a lot more with tools and bikes it's still a great investment in terms of learning and keeping myself entertained.
– Andy Stannard
Dec 13 at 10:38
add a comment |
As ojs says, you have a spindle for cottered cranks. Cottered cranks basically do not exist anymore, unless you look for 'vintage' parts. To fit a new single speed crank you need to replace the bottom bracket bearings and axle along with the crank.
Your bottom bracket shell is am internally threaded kind. The most commonly encountered standard for thread width and pitch is known as 'English' or 'BSA'. On an older bike this may not be the case.
If your bike is English threaded there are lots of options available. Probably the best option is a threaded internal cartridge BB bearing with square taper or splined crank interface. Square taper single speed cranks are plentiful and inexpensive. This also allows you to choose the spindle length to get the chainline you need.
If you can get the old bearings out and ca get hold of an old English threaded BB you could try it for size. I say this a bit hesitantly though because I have a feeling there are some threadings that are close to but not exactly the English standard.
Update: Sheldon Browns page on threaded BB shells for reference: https://www.sheldonbrown.com/cribsheet-bottombrackets.html
answered Dec 11 at 16:41
Argenti Apparatus
32.3k23481
add a comment |
As ojs says, you have a spindle for cottered cranks. Cottered cranks basically do not exist anymore, unless you look for 'vintage' parts. To fit a new single speed crank you need to replace the bottom bracket bearings and axle along with the crank.
Your bottom bracket shell is am internally threaded kind. The most commonly encountered standard for thread width and pitch is known as 'English' or 'BSA'. On an older bike this may not be the case.
If your bike is English threaded there are lots of options available. Probably the best option is a threaded internal cartridge BB bearing with square taper or splined crank interface. Square taper single speed cranks are plentiful and inexpensive. This also allows you to choose the spindle length to get the chainline you need.
If you can get the old bearings out and ca get hold of an old English threaded BB you could try it for size. I say this a bit hesitantly though because I have a feeling there are some threadings that are close to but not exactly the English standard.
Update: Sheldon Browns page on threaded BB shells for reference: https://www.sheldonbrown.com/cribsheet-bottombrackets.html
answered Dec 11 at 16:41
Argenti Apparatus
32.3k23481
add a comment |
As ojs says, you have a spindle for cottered cranks. Cottered cranks basically do not exist anymore, unless you look for 'vintage' parts. To fit a new single speed crank you need to replace the bottom bracket bearings and axle along with the crank.
Your bottom bracket shell is am internally threaded kind. The most commonly encountered standard for thread width and pitch is known as 'English' or 'BSA'. On an older bike this may not be the case.
If your bike is English threaded there are lots of options available. Probably the best option is a threaded internal cartridge BB bearing with square taper or splined crank interface. Square taper single speed cranks are plentiful and inexpensive. This also allows you to choose the spindle length to get the chainline you need.
If you can get the old bearings out and ca get hold of an old English threaded BB you could try it for size. I say this a bit hesitantly though because I have a feeling there are some threadings that are close to but not exactly the English standard.
Update: Sheldon Browns page on threaded BB shells for reference: https://www.sheldonbrown.com/cribsheet-bottombrackets.html
answered Dec 11 at 16:41
Argenti Apparatus
32.3k23481
As ojs says, you have a spindle for cottered cranks. Cottered cranks basically do not exist anymore, unless you look for 'vintage' parts. To fit a new single speed crank you need to replace the bottom bracket bearings and axle along with the crank.
Your bottom bracket shell is am internally threaded kind. The most commonly encountered standard for thread width and pitch is known as 'English' or 'BSA'. On an older bike this may not be the case.
If your bike is English threaded there are lots of options available. Probably the best option is a threaded internal cartridge BB bearing with square taper or splined crank interface. Square taper single speed cranks are plentiful and inexpensive. This also allows you to choose the spindle length to get the chainline you need.
If you can get the old bearings out and ca get hold of an old English threaded BB you could try it for size. I say this a bit hesitantly though because I have a feeling there are some threadings that are close to but not exactly the English standard.
Update: Sheldon Browns page on threaded BB shells for reference: https://www.sheldonbrown.com/cribsheet-bottombrackets.html
answered Dec 11 at 16:41
Argenti Apparatus
32.3k23481
edited Dec 11 at 19:15
answered Dec 11 at 16:41
Argenti Apparatus
32.3k23481
answered Dec 11 at 16:41
Argenti Apparatus
32.3k23481
answered Dec 11 at 16:41
Argenti Apparatus
32.3k23481
32.3k23481
add a comment |
add a comment |
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2
That's what's known as a "normal, everyday crank" .. in 1960.
– Daniel R Hicks
Dec 11 at 13:14