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Review title: Great Shimano Sora Cassette Gears
Product review: I ordered this 12-13-14-15-16-17-19-21T 8 speed Shimano Sora, and it is great so far for my biking level of my road bike. I use the gears 12-14T at the most with a cadence of about 90-100 RPM and I can go for about 36-40 MPH speed on the flat and downhill. For the uphill with a grade of about 5 to 8 degrees, I use 15-19T gears. I rarely use 21T gear, only when there is a big uphill like around 10 degrees. I am very happy with this compact gears. I have a triple Sora Shimano crankset of 30-42-52T in the front of my road racing bike. Most of the time I use 42-52T front gears with 80-100 RPM cadence. I rarely use 30T front gear only for big uphill. This compact cassette gears are smooth in changing gears. It is compatible for both 8 speed of any bike such as road bikes and mountain bikes. I use this for my 24 speed road bike, 3 front gears of 30-42-52T x multiply by back 12-13-14-15-16-17-19-21T = 24 speeds.
