So long as your SRAM 9-10 speed rear derailleur is still performing, improve its performance with pulleys that reduce mechanical drag and increase bearing life. You’ll go faster with the same effort. Whether you’ve got a SRAM 9- or 10-speed...
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Are they worth it?
I only have one ride on the hockey wheels but so far they work well. Better than the original? That is still yet to be determined. They definitely have very little friction which will certainly be an improvement. Install on my SRAM Red was very simple. Time will tell.