Bicycle Mechanics - 9 spd cassette compatability

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allroy71
06-09-09, 09:17 AM
I currently have a Tiagra HG50 9 spd 12/25.

http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/CS/EV-CS-HG50-9R-1880A_v1_m56577569830608763.pdf

I want to get a little lower gearing and I thought about a HG80 11-28.

http://harriscyclery.net/itemdetails.cfm?id=732

I don't think there should be a problem, but I am still confused about the 11 tooth. Does it use a different lockring?

Al Criner
06-09-09, 09:42 AM
The lock ring comes with the cassette, use the same tool to put it on that you use to take off the HG50.
Tabor
06-09-09, 10:00 AM
FYI: Your rear derailer might not clear 28T, if it is a shimano road derailer it is only guaranteed to work with 27T. That said, it probably won't be a problem, I am pretty sure there are people around running 29T.

allroy71
06-09-09, 10:20 AM
I have a long cage Tiagra rear derailleur, so I shouldn't have a clearance problem. Thanks.
Al1943
06-09-09, 11:19 AM
I have a long cage Tiagra rear derailleur, so I shouldn't have a clearance problem. Thanks.

The length of the derailleur cage has nothing to do with big cog clearance. A long cage Tiagra will most likely clear a 28t cog, but so will a short cage.

Al