Tiagra Rear Derailleur GS (10-speed)
FEATURES
Consistently smooth and light shifting operation
Wider, Rider Tuned 10-speed gearing options
Robust adjustability
Model Number : RD-4700-SS
Series : TIAGRA
Cassette Compatibility : 10
Maximum Sprocket : Low sprocket: 34T / Top sprocket:12T (front double) / 20T Low sprocket: 32T / Top sprocket:12T(front triple)
Minimum Sprocket : Low sprocket: 28T / Top sprocket:11T (front double) / 20T Low sprocket: 25T / Top sprocket:11T(front triple)
Maximum Front Difference : 16T (front double) / 20T (front triple)
Total Capacity : 39T (front double) / 41T (front triple)
http://bike.shimano.com/content/sac-bike/en/home/components11/road/Tiagra4700/rd-4700-gs.html
http://www.ebay.com/itm/Soma-Wolverine-50cm-Complete-Bike-105-Group-Set-/121783221648?hash=item1c5ad87d90:g:2hgAAOSw5VFWF-r~
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