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Will an old Shimano 105SC crank work with Ultegra 9sp?(8 posts)

Will an old Shimano 105SC crank work with Ultegra 9sp?FlySpinner
Jan 30, 2003 1:30 PM
Will an old Shimano 105SC crank work with a Ultegra 9sp drivetrain?

The 105 is the 7sp version circa 1988. I am considering upgrading the rear parts to 9sp Ultegra. ( The "new bike" money just got spent 8( on an emergency Heating and Air upgrade, so capital for this upgrade is tight.) Will this upgrade work by replacing the chainrings with 9sp chainrings or is there spacing issues between the chainrings with this old crank I should consider. I know a new 105 crank and BB will run about $140, but if I can do the chainrings only, It will leave more for a rear wheel.

Needing some help...

Richard.
re: Will an old Shimano 105SC crank work with Ultegra 9sp?Mike Prince
Jan 30, 2003 2:04 PM
Yes it will work with no issues. The inner chainring is "dished" towards the spider to create the narrower spacing. I've done this several times and it works fine.

Have fun
Mike
re: Will an old Shimano 105SC crank work with Ultegra 9sp?Eric_H
Jan 30, 2003 4:04 PM
Actually, all you need is the inner ring. It sits a little further over towards the big ring compared to a 7/8 spd system. If your big ring is in OK shape it should work fine.
re: New small ring not really needed...nmRusty Coggs
Jan 30, 2003 5:05 PM
nm
Similar experience with Ultegra 7 speed, except....B2
Jan 30, 2003 7:39 PM
when I converted to 9spd drivetrain, shifting to the big ring really didn't work (at all) until I changed the big ring to a 9 speed ring. I know this is contrary to what everybody recommends (changing the small ring), but this is what it took to get mine to work correctly.

Bryan
re: Will an old Shimano 105SC crank work with Ultegra 9sp?FlySpinner
Jan 31, 2003 7:34 AM
Thanks everyone.

B2... That is what I was thinking. So I was planning for both rings.

Richard
re: Will an old Shimano 105SC crank work with Ultegra 9sp?RJF
Jan 31, 2003 11:40 AM
I use my old 8-speed 105 cranks and rings with an otherwise brand new 9-speed Ultegra drivetrain with absolutely no problem. Don't know the difference between 7 speed and 8 speed 105 cranks and rings, though.
DependsSpoke Wrench
Feb 1, 2003 5:55 AM
On a customer bike, I'd replace both chainrings the first time around. I hate it when a bike comes back for the same thing and I usually have to cut them a better deal on the cost of the needed parts.

On my personal bike, I'd try it the way that it is and only buy new parts if I couldn't get the current ones to work to my satisfaction.