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CS-7401 was linked to in my first post, I guess my quick edit was missed 
Does this cassette exist?
- Thread starter TGR
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Richard, you're getting forgetful, I told you this the other week!
All 8 speed shimano cassettes ate the same sprocket thickness and spacing and completely interchangeable. Dura ace 8 speed cassettes exist, but they only differ in materials and finishing, nothing else. So if your hubs are for 8 speed, than any shimano 8 speed cassette will work. UG only went up to 7 speed - 8 and above is all HG. 7 speed was the cross-over, and both UG and HG cassettes ate available in 7. It's here where DA is different - DA UG cassettes use a smaller thread on the locking sprocket than ultegra and below.
Like I said, if you have 8 speed hubs, any 8 s cassette will work.
The only parts that must be matched when using 8 speed DA are the DA gear levers and rear mech (maybe the front too if using STI levers). You can't use an 8s DA rear mech with 8s ultegra levers, for example.
Hope this helps!
All 8 speed shimano cassettes ate the same sprocket thickness and spacing and completely interchangeable. Dura ace 8 speed cassettes exist, but they only differ in materials and finishing, nothing else. So if your hubs are for 8 speed, than any shimano 8 speed cassette will work. UG only went up to 7 speed - 8 and above is all HG. 7 speed was the cross-over, and both UG and HG cassettes ate available in 7. It's here where DA is different - DA UG cassettes use a smaller thread on the locking sprocket than ultegra and below.
Like I said, if you have 8 speed hubs, any 8 s cassette will work.
The only parts that must be matched when using 8 speed DA are the DA gear levers and rear mech (maybe the front too if using STI levers). You can't use an 8s DA rear mech with 8s ultegra levers, for example.
Hope this helps!
