Changing Crank
08-04-05, 09:38 AM
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Changing Crank
Right now I am riding a 2004 Specialized Allez Elite Triple road bike. I never use my 3rd ring and am now looking to change to a double. Is this a very involved process or is it as simple as switching one for the other? I am using Shimano 105 components so do I need to buy a Shimano 105 double crank? Thank you in advance for your help.
08-04-05, 09:49 AM
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Originally Posted by Flynn
Right now I am riding a 2004 Specialized Allez Elite Triple road bike. I never use my 3rd ring and am now looking to change to a double. Is this a very involved process or is it as simple as switching one for the other? I am using Shimano 105 components so do I need to buy a Shimano 105 double crank? Thank you in advance for your help.
08-04-05, 09:50 AM
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Originally Posted by sydney
Ya don't have to buy a shimano double 105 crank, but you will have to buy the correct BB for the crank you choose. The 105 triple uses a 118 octalinkspindle and the double uses a 109.5
08-04-05, 10:31 AM
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Originally Posted by sydney
Ya don't have to buy a shimano double 105 crank, but you will have to buy the correct BB for the crank you choose. The 105 triple uses a 118 octalinkspindle and the double uses a 109.5
Sheldon "Chainline" Brown
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+------------------------------------------------------------+ | A touchstone to determine the actual worth of an | | "intellectual"--find out how he feels about astrology. | | --Robert A. Heinlein | +------------------------------------------------------------+
08-04-05, 11:19 AM
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Originally Posted by Sheldon Brown
That's correct. However, there's no need to buy a new crank, you can just remove the small chainring and its bolts and installthe shorter bottom bracket. It would work with the original bottom bracket too, but the chainline will be better with the 109 mm BB.
Sheldon "Chainline" Brown
Sheldon "Chainline" Brown
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+------------------------------------------------------------+ | A touchstone to determine the actual worth of an | | "intellectual"--find out how he feels about astrology. | | --Robert A. Heinlein | +------------------------------------------------------------+
08-04-05, 12:32 PM
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my wife rides a triple minus the inner ring. often triples will have a 42 tooth middle ring and doubles a 39 tooth. i swapped my wifes 42 for a 38(smallest you can go on your cranks)....
....is it me or does that last sentence sound disturbing?
love it when sir sheldon takes time to reply. bravo!
....is it me or does that last sentence sound disturbing?
love it when sir sheldon takes time to reply. bravo!
08-04-05, 03:03 PM
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So all needed is to remove a chain ring? And maybe a new BB? How much would a new BB run? Would it work right?
Elvish
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08-04-05, 03:10 PM
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Originally Posted by Elvish Legion
So all needed is to remove a chain ring? And maybe a new BB? How much would a new BB run? Would it work right?
The 105 version is $43.95, Ultegra is $55.95. Either would work, but I think the Ultegra is a wee bit lighter.
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08-04-05, 03:12 PM
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Originally Posted by Sheldon Brown
See: https://sheldonbrown.com/harris/botto...s.html#shimano
The 105 version is $43.95, Ultegra is $55.95. Either would work, but I think the Ultegra is a wee bit lighter.
Sheldon "Parts" Brown
The 105 version is $43.95, Ultegra is $55.95. Either would work, but I think the Ultegra is a wee bit lighter.
Sheldon "Parts" Brown
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+---------------------------------------------------------+ | It is good to learn from your mistakes; | | It is better to learn from the mistakes of others. | +---------------------------------------------------------+
Score for $43.95 I could have a fake double
08-04-05, 05:34 PM
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Just making sure I have what I need.
New BB, double? Can be picked up at LBS?
Adjust Shifter lever so it doesn't try to skip?
New BB, double? Can be picked up at LBS?
Adjust Shifter lever so it doesn't try to skip?
08-04-05, 06:05 PM
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Originally Posted by Elvish Legion
Just making sure I have what I need.
New BB, double? Can be picked up at LBS?
Adjust Shifter lever so it doesn't try to skip?
New BB, double? Can be picked up at LBS?
Adjust Shifter lever so it doesn't try to skip?
Middle: Take off the granny ring, put in a 109.5 BB and adjust limit screw on FD.
Ideal: Swapout for double cranks, install new BB and adjust limit screw.
Ultimate: Ideal plus short cage rear derailler and shorten chain.
On either option involving keeping your old crank you can always swap out the 42 ring for a 39. Probably about $25 mail order. Everything is fairly easy to do although you will need a BB socket and a crank puller.
08-04-05, 07:02 PM
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Originally Posted by capwater
Cheapest: Take off the granny ring and adjust limit screw on front derailler.
Middle: Take off the granny ring, put in a 109.5 BB and adjust limit screw on FD.
Ideal: Swapout for double cranks, install new BB and adjust limit screw.
Ultimate: Ideal plus short cage rear derailler and shorten chain.
Middle: Take off the granny ring, put in a 109.5 BB and adjust limit screw on FD.
Ideal: Swapout for double cranks, install new BB and adjust limit screw.
Ultimate: Ideal plus short cage rear derailler and shorten chain.
08-04-05, 07:04 PM
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Originally Posted by Elvish Legion
Just making sure I have what I need.
New BB, double? Can be picked up at LBS?
Adjust Shifter lever so it doesn't try to skip?
New BB, double? Can be picked up at LBS?
Adjust Shifter lever so it doesn't try to skip?
08-05-05, 02:48 PM
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I think I'll see how much LBS wants for a double crank and new BB, seems pretty simple, and they will adjust anything that needs to be with out me worring about doing it right. So I will price 'Ideal' set up, LBS usally cuts me a good deal, esp since they can resell the BB and crank (brand new bike one comes in triple)
