Are all chainring bolts the same size?
12-11-06, 01:18 PM
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Are all chainring bolts the same size?
I took apart my double chainring and thought I should replace the bolts. The LBS said they didn't have any of the same size, so I went on ebay to snoop around, and those don't show any size. This leads me to believe that they are all the same size. Is that true?
12-11-06, 02:01 PM
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Originally Posted by axelfox
I took apart my double chainring and thought I should replace the bolts. The LBS said they didn't have any of the same size, so I went on ebay to snoop around, and those don't show any size. This leads me to believe that they are all the same size. Is that true?
Some older cranks, mid-80s and earlier lower end models used oddball, un-obtainable bolts, usually with a smaller diameter hole.
If you had thought to mention what make and model your crankset is I could probably have told you for sure.
Sheldon "Maybe" Brown
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+-----------------------------------------------------+ | Life is the art of drawing sufficient conclusions | | from insufficient premises. --Samuel Butler | +-----------------------------------------------------+
12-11-06, 02:05 PM
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Originally Posted by axelfox
I took apart my double chainring and thought I should replace the bolts. The LBS said they didn't have any of the same size, so I went on ebay to snoop around, and those don't show any size. This leads me to believe that they are all the same size. Is that true?
However they come in different lengths. There is a standard length that is long enough to pass through two chainrings and the spider (works with most double or triple chainring setups). And then there is a shorter length that is only long enough to pass through one ring and the spider, which is typically used for single-chainring setups and to attach granny rings to the inside of the spider. These are typically sold on ebay as "BMX" or "fixed gear" or "singlespeed" chainring bolts.
Hope that helps!
12-11-06, 02:38 PM
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Originally Posted by Sheldon Brown
Most are the same size, use a 5 mm Allen bolt and a nut on the back side that takes a pin spanner. They fit a 10 mm hole.
Some older cranks, mid-80s and earlier lower end models used oddball, un-obtainable bolts, usually with a smaller diameter hole.
If you had thought to mention what make and model your crankset is I could probably have told you for sure.
Sheldon "Maybe" Brown
Some older cranks, mid-80s and earlier lower end models used oddball, un-obtainable bolts, usually with a smaller diameter hole.
If you had thought to mention what make and model your crankset is I could probably have told you for sure.
Sheldon "Maybe" Brown
Code:
+-----------------------------------------------------+ | Life is the art of drawing sufficient conclusions | | from insufficient premises. --Samuel Butler | +-----------------------------------------------------+
12-11-06, 02:53 PM
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I think track cranks are a little shorter. At least I remember road ones being too long to tighten correctly on my track bike.
edit: nevermind, that was when I put a road chainring on by mistake.
edit: nevermind, that was when I put a road chainring on by mistake.
12-11-06, 02:57 PM
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Originally Posted by urbanknight
I think track cranks are a little shorter. At least I remember road ones being too long to tighten correctly on my track bike.
edit: nevermind, that was when I put a road chainring on by mistake.
edit: nevermind, that was when I put a road chainring on by mistake.
If you have access to a power grinder, it's very easy to make longer bolts work with a single chainring by grinding about 2 mm off their length.
