Your first mechanic is correct. You would definitely need to buy a new crank if you'd like a 53/39 set up. The bolt pattern on compact cranks and a double are entirely different.. hence not compatible. The other issue is that you definitely should change your chain to accomodate the bigger gearing. Front derailleur will need to be adjusted as well. If you decide to upgrade to another crank, have your mechanic check the length of your current bottom bracket with the new crank... it also might be two different lengths.
Good luck with your decision!
http;//chasecyclery.blogspot.com
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05-30-2011, 11:06 AM #1
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05-30-2011, 05:33 PM #2
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Thanks for adding on! Didn't think about the bottom bracket. OK, something else to check into.
Originally Posted by ridebikeme
Your first mechanic is correct. You would definitely need to buy a new crank if you'd like a 53/39 set up. The bolt pattern on compact cranks and a double are entirely different.. hence not compatible. The other issue is that you definitely should change your chain to accomodate the bigger gearing. Front derailleur will need to be adjusted as well. If you decide to upgrade to another crank, have your mechanic check the length of your current bottom bracket with the new crank... it also might be two different lengths.
Good luck with your decision!
http;//chasecyclery.blogspot.com
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