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Long drive train question(3 posts)

Long drive train questionburhed
Jul 12, 2002 8:45 AM
I have a Spec Allez with 105 all around. Front crank is 175 triple. I'd like to slowly start to upgrade to Ultegra on this bike, but upgrade to just double front crank. Can I mix and match triple and double parts; ie, can I put a Ultegra double crank and and still use the 105 rear derailer and the 105 STI triple shifters? This will most likely be a long process and I'd like to just add these parts as I see them at a good price (or they break).

Any help is appreciated, thanks.
There should be no problem...Cima Coppi
Jul 12, 2002 9:15 AM
Moving to a double crankset, however, you'll also want to change out your front derailleur at the same time. Since this component is not that expensive, it should be done with the crankset upgrade. Also, while you are at it, you may want to change out the chain. You did not say what the chainring are you are currently using, but I suspect you'll want to go with the standard 39/53 double set up. Make certain you have the chain length correct when you change out the cranks.

Good luck

Bottom bracket is also differnt size on a double.Juanmoretime
Jul 14, 2002 5:39 AM
You will have to replace your bottom bracket in order to have the correct chainline when going to the double crank besides the front derailluer.