Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 9-speeds and a really good wide ratio...

This cog set is 9 speeds, and goes from 11 teeth for the top gear to 34 teeth for the low gear. It's a nice wide ratio to cover everything from steep hillclimbs to high-speed downhills. Watch out for clearance to the derailleur wheel, as 34 teeth is very close to the max for deore shifters. Works flawlessly for me.