Shimano's Dura-Ace 10-speed Cassette is comprised of an aluminum cog carrier, 4 titanium and 6 steel cogs (from largest to smallest respectively). This makes for a super-light and stiff cassette that makes your derailleur shift like a dream so you can dance up the climbs as easily and efficiently as your chain climbs up and down these cogs.

Shimano's Ultegra 10-Speed Cassette delivers pro-level shifting and durability. The computer-enhanced tooth shapes and tough cogs mean you can shift quickly, precisely and smoothly even under pressure.

When it's time to replace your 9-speed cassette, check out SRAM's PG-950 cassette. It delivers solid shifting and durability ride in and ride out for your 9-speed rig.

When it's time to replace your old 8-speed cassette, check out SRAM's PG-850. Its steel construction and SRAM's PowerGlide technology combine to deliver miles of solid shifting and outstanding durability.

SRAM's PG-1030 10-Speed Cassette is a great choice. It's constructed of light and durable materials and boasts SRAM's PowerGlide tooth profiles and shift ramps for quick and positive gear changes every time. This trick cassette is available in four configurations perfect for riding off road, including one with a 36-tooth largest cog for super-easy climbing.

Shimano's Sora cassette is an incredible value for your 9-speed drivetrain. Crisp shifting and a low weight keep your mind focused on having fun on your bike and not adjusting it. This cassette comes in a range of sizes to suit your riding style and terrain.

SRAM's 1070 10-Speed Cassette is a great choice. It's constructed of light and durable materials and boasts SRAM's PowerGlide tooth profiles and shift ramps for quick and positive gear changes every time. This trick cassette also sports a semi-spider construction for a maximum stiffness-to-weight ratio, a lightweight aluminum lockring, and is available in myriad configurations to suit all your riding. There are even models with 36-tooth largest cogs for super-easy climbing.

Ridiculously strong and incredibly light, SRAM's XG-1180 11-Speed Cassette is a feat of engineering. Mini Cluster construction combines three small cogs that are CNC-machined out of a single block of billet steel with an additional eight cogs that are individually pinned together. Advanced tooth profiles and shift ramps produce quick, positive gear changes. The XG-1180 delivers SRAM’s trusted cassette design with a massively-wide gear range to tackle any terrain.

Machined from heat-treated, chrome-plated chromoly, these seriously tough cogs will hold up to massive track sprints and crazy skid-stops. Surly's Track Cogs are strong, shiny and they come in two widths and sizes from 13T to 22T so you can select the perfect gear.

With its wide range, SRAM's XX1 11-Speed X-Glide Cassette gives you a clean, simple 1x11 drivetrain. It has a 10-42 tooth spread that gives you pretty much the same gearing as 2- and 3-ring setups without the REDundancy, shifting issues and weight penalty. Yes, you can still spin up your hardest climbs. A key thing to note, is that even with the huge range, there are no huge jumps or dips in the gearing, so your cadence and pedaling stay consistent as you move up and down the entire cassette. The wide open design makes it incREDibly lightweight and aids in mud clearance, giving you cleaner shifting and longer component life. It requires an XD driver hub freebody (sold separately) that further REDuces your wheel's weight and improves the hub connection. Welcome to the future of mountain bike drivetrains.

SRAM's PG-970 9-Speed Cassette is the perfect replacement for your worn-out gears. It features a rugged steel construction for awesome durability and SRAM's PowerGlide technology for smooth, precise shifts.

Reliable, perfect shifting awaits with Shimano's Deore XT Dyna-Sys Cassette. It features chrome-plated steel sprockets mounted to two aluminum carriers for an ideal blend of durability and low weight. Closer gear ratios in the middle of the cassette ensure you'll have the perfect gear for the trail's ups and downs. Plus, the cogs are ramped and machined for flawless, lightning-fast shifts.

SRAM's PowerGlide PG-830 Cassette is a quality 7-speed cassette. It boasts durable chrome-plated steel cogs with SRAM's shifting technology that includes optimal tooth profiles and ramps for fast, precision shifts every time.

Shimano's Claris cassette is an incredible value for your 8-speed drivetrain. This cassette comes in a range of sizes to suit your riding style and terrain.

Shimano Dura-Ace R9100 Cassette Spacers

Shimano Cassette Lockrings

Shimano Cassette Lockrings.

Shimano Cassette Lockrings

SRAM's PG-730 7-Speed Cassette is the perfect replacement for your worn-out gears. It features a rugged steel construction for awesome durability and SRAM's PowerGlide technology for smooth, precise shifts throughout its 12-32 tooth range.

Campagnolo's Record 11-Speed Cassette has been expertly engineered for unparalleled shifting and maximum power transfer. Its largest 3 cogs are constructed from titanium for light weight, while the other 8 are made of nickel-plated steel for durability. Plus, the cogs are mounted on a light and rigid aluminum carrier, and the cassette is secured to the rear hub with a feathery aluminum lockring.

SRAM's 1050 10-Speed Cassette is a great choice. It's constructed of light and durable materials and boasts SRAM's PowerGlide tooth profiles and shift ramps for quick and positive gear changes every time. This trick cassette also sports a semi-spider construction for a maximum stiffness-to-weight ratio and is available in myriad configurations to suit all your riding. There are even models with 36-tooth largest cogs for super-easy climbing.

Simplify your drivetrain with SRAM's XG-1195 11-Speed X-Glide Cassette. It has a monstrous 10-42 tooth spread that gives SRAM's 1x11 drivetrain pretty much the same gearing as 2- and 3-ring setups, with less weight, parts, and complexity. Yes, you can still spin up your hardest climbs. A key thing to note, is that even with the huge range, there are no huge jumps or dips in the gearing, so your cadence and pedaling stay consistent as you move up and down the entire cassette. The wide-open design makes it incredibly lightweight and aids in mud clearance, giving you cleaner shifting and longer component life. The XG-1195 is for use with SRAM's X01 or XX1 drivetrain.

When it comes down to the wire, you can always count on Shimano's XTR 10-Speed Cassette for smooth, reliable shifting. The 5 largest cogs are made of titanium and mounted on a 3-piece aluminum carrier for increased rigidity and significant weight savings. Dyna-Sys design gives you closer gear ratios in the middle of the cassette, ensuring you'll have the perfect gear for the trail's ups and downs. Shimano's Hyperglide computer-designed ramps and tooth profiles ensure quick and accurate shifting

• Four carbon carriers and six titanium cogs for reduced weight • Nickel-plated finish for corrosion and wear resistance • Dyna-sys 11-speed cassette with "Rhythm step" gearing for closer gear ratios and smoother shifting performance • Fits Dyna-sys 11 and current Shimano 9/10-Speed MTB hubs • The largest cog (40t) is positioned inboard and above the drive-side flange • Hubs with tall drive-side flanges may not be compatible due to spoke interference • Range: 11-40

• Steel construction on all but the largest aluminum gear • Nickel-plated finish for corrosion and wear resistance • Dyna-sys 11-speed cassette with "Rhythm step" gearing for closer gear ratios and smoother shifting performance • Fits Dyna-sys 11-speed and current Shimano 9/10-Speed MTB hubs • The largest cog (40t) is positioned inboard and above the drive-side flange • Hubs with tall drive-side flanges may not be compatible due to spoke interference

- Rider Tuned Gearing - Wider Gear Combination: 11-28T/12-28T/11-30T (New Gear Combination) - Closer Gear Combination: 11-25T/12-25T - Lightweight - CFRP & Alloy Spider Arm, 5 Titanium Sprockets - Gear Combination: 11-25T, 11-28T, 11-30T (New Gear Combination), 12-25T, 12-28T

Shimano HG-800 11-speed cassette. - High-performance gear combinations provide superior rider choice - With hub body for MTB to fit a variety of bikes from MTB to road - Average Weight: 335 grams

Shimano XT CS-M770 9-Speed Cassette - Aluminum carrier reduces weight and increases rigidity - Cassette Body Type: Shimano/SRAM 8, 9, 10 Speed - Drivetrain Speeds: 9 - Weight: 323 grams

When it's time to replace your 9-speed cassette, check out SRAM's PG-980 cassette. It delivers solid shifting and durability for your 9-speed rig.

Get reliable shifting in a sweet lightweight package with SRAM's PG-990 9-speed cassette. It meet the demands of mountain bikers everywhere, from elite racers to weekend trail riders. Cut from steel with an aluminum spider, the 990 is light, durable and shifts flawlessly. Tested on the pro circuit. Proven on your local ride.