Replacing crankset and bottom bracket
04-25-15 | 10:23 AM
#1
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From: Southeast Michigan
Bikes: 2012 Specialized Tarmac Apex Mid Compact, 2013 Specialized Sirrus Elite, 2007 Giant Boulder se
Replacing crankset and bottom bracket
I have a 2013 specialized sirrus elite and need to replace the crankset (it is trashed and i might as well replace the bottom bracket anyway). Here are the specs off the website:
CRANKSETShimano FC-M391 triple, 9-speed, w/chainguard
CHAINRINGS48/36/26, w/ chainguard
BOTTOM BRACKET Cartridge bearing, square spindle w/ crank stop right side, capless bolts
It is also a 9 speed drivetrain. I am looking to replace it with a crankset with the relatively same gear ratio on the front with a chainguard and a bottom bracket that will work with my bike. I am fairly new to repairing bikes so I am not sure what components to get.
I already have an octalink crank puller and a shimano bottom bracket remover in my wishlist and also have found a cheap crankset on amazon https://www.amazon.com/dp/B003ZMDJW6/...=IFCGRVVD8N1ZQ
I am not sure if this would work with my bike or what bottom bracket would be compatible. Thanks.
CRANKSETShimano FC-M391 triple, 9-speed, w/chainguard
CHAINRINGS48/36/26, w/ chainguard
BOTTOM BRACKET Cartridge bearing, square spindle w/ crank stop right side, capless bolts
It is also a 9 speed drivetrain. I am looking to replace it with a crankset with the relatively same gear ratio on the front with a chainguard and a bottom bracket that will work with my bike. I am fairly new to repairing bikes so I am not sure what components to get.
I already have an octalink crank puller and a shimano bottom bracket remover in my wishlist and also have found a cheap crankset on amazon https://www.amazon.com/dp/B003ZMDJW6/...=IFCGRVVD8N1ZQ
I am not sure if this would work with my bike or what bottom bracket would be compatible. Thanks.
04-25-15 | 10:34 AM
#2
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From: Minnesota
Bikes: '09 Trek 2.1 * '75 Sekine * 2010 Raleigh Talus 8.0 * '90 Giant Mtb * Raleigh M20 * Fuji Nevada mtb
You need the Shimano FC-M391 as a direct replacement, least problematic. I just went through that with a 8 sp, Octalink.
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FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
04-25-15 | 10:35 AM
#3
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From: Southeast Michigan
Bikes: 2012 Specialized Tarmac Apex Mid Compact, 2013 Specialized Sirrus Elite, 2007 Giant Boulder se
04-25-15 | 10:48 AM
#4
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From: Minnesota
Bikes: '09 Trek 2.1 * '75 Sekine * 2010 Raleigh Talus 8.0 * '90 Giant Mtb * Raleigh M20 * Fuji Nevada mtb
You can see the responses I had on a very recent thread:
https://www.bikeforums.net/bicycle-me...-crankset.html
By the time I got done, I bet I didn't save over $10 after shipping charges, compared to buying one or two chainrings, and not being confident they would shift properly.
Check Shimano TechDocs if you can find them to see if the crankset you picked out is compatible with the FD you have - there might be a difference, even being a 9 sp crankset.
Looks like you have square taper already? Then you need a square taper crank puller, not Octalink. How did the crankset get trashed on such a new bike? Is it the chainrings or cranks too?
See, I did this once, makes me a BF Expert. Not....
https://www.bikeforums.net/bicycle-me...-crankset.html
By the time I got done, I bet I didn't save over $10 after shipping charges, compared to buying one or two chainrings, and not being confident they would shift properly.
Check Shimano TechDocs if you can find them to see if the crankset you picked out is compatible with the FD you have - there might be a difference, even being a 9 sp crankset.
Looks like you have square taper already? Then you need a square taper crank puller, not Octalink. How did the crankset get trashed on such a new bike? Is it the chainrings or cranks too?
See, I did this once, makes me a BF Expert. Not....
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FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
Last edited by RoadTire; 04-25-15 at 11:06 AM. Reason: 'cause I just can't get it right....
04-25-15 | 10:56 AM
#5
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From: Mid Willamette Valley, Orygun
Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. 2019 Giant Explore E+3
I'm curious about "trashed"?
You do realize the teeth appear to be missing/worn out on a NEW crank set, don't you?
You do realize the teeth appear to be missing/worn out on a NEW crank set, don't you?
04-25-15 | 11:11 AM
#6
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From: Minnesota
Bikes: '09 Trek 2.1 * '75 Sekine * 2010 Raleigh Talus 8.0 * '90 Giant Mtb * Raleigh M20 * Fuji Nevada mtb
If you are confident the one you want (M131) will work, xtremebikeandsport has it a cheap as you are likely to find. And if this is the same xtgreambikeandsport that is on ebay, they shipped my really fast.
https://www.amazon.com/Shimano-M131-C...981806&sr=1-47
https://www.amazon.com/Shimano-M131-C...981806&sr=1-47
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FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
04-25-15 | 11:36 AM
#7
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From: Eugene, Oregon, USA
What happened to the old crankset? Does it have replaceable chain rings? It would take a lot of miles to wear out a crankset in 2 years.
The local Bike Co-op may also have miscellaneous cranks and chainrings that would work for you. It doesn't hurt to swing by.
One of the problems with the M131 is that it doesn't have replaceable rings. Perhaps the whole crankset is as cheap as new rings, but it does limit you somewhat if you're wearing heavily on your equipment.
The local Bike Co-op may also have miscellaneous cranks and chainrings that would work for you. It doesn't hurt to swing by.
One of the problems with the M131 is that it doesn't have replaceable rings. Perhaps the whole crankset is as cheap as new rings, but it does limit you somewhat if you're wearing heavily on your equipment.
04-25-15 | 01:42 PM
#8
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From: Roswell, GA
Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta
04-25-15 | 03:23 PM
#10
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From: Llano Estacado
Bikes: old clunker
04-25-15 | 04:02 PM
#11
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From: Minnesota
Bikes: '09 Trek 2.1 * '75 Sekine * 2010 Raleigh Talus 8.0 * '90 Giant Mtb * Raleigh M20 * Fuji Nevada mtb
I'm beginning to turn blue on this, holding my breath, waiting for more info. Trashed crankset means bent and damaged. Unless worn, then that also means a new chain and cassette.
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FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
