Ideal for commuters, rail-trail riders, touring riders and entry-level MTB riders who want easier climbing gears from an 8-speed bike without the cost of a full drivetrain swap.
The Shimano CS-HG400-8 is a smart upgrade for riders who want more climbing range from an 8-speed setup without moving to a more expensive drivetrain. With its 11-40T spread and 11-13-15-18-22-27-33-40T progression, it gives you a much easier lowest gear than a typical commuter or entry-level MTB cassette, which can make a real difference on steep bike paths, fire roads and loaded rides.
What we like here is how straightforward it is. This cassette uses HYPERGLIDE shifting and fits Shimano’s HG spline M standard, so it suits many bikes already running 8-speed cassettes on a standard Shimano-style freehub. It’s also listed for IG/HG 8/7/6-speed chains, which is handy if you’re refreshing an older drivetrain rather than rebuilding the whole bike.
For the right bike, this is a very cost-effective way to get lower gearing and keep the crisp, familiar feel many riders expect from Shimano. The main thing to check before buying is rear derailleur capacity and max sprocket clearance, because 40T is much larger than a typical 8-speed road or hybrid cassette. If your current derailleur is designed around smaller cogs, you may need a compatible long-cage rear derailleur to make the most of it.
11-40T wide range
Gives you a noticeably easier low gear for steep climbs, heavy commuting loads and mixed-terrain riding.
8-speed simplicity
Keeps setup straightforward for riders who prefer durable, affordable 8-speed drivetrains over more complex systems.
HYPERGLIDE shifting
Designed to deliver smooth, dependable gear changes across the cassette rather than clunky jumps under load.
Useful sprocket progression
The 11-13-15-18-22-27-33-40T layout balances everyday gears up top with a true bailout cog at the bottom.
Premium plated finish
Adds a cleaner finish and helps this cassette feel like a worthwhile step up from basic entry-level replacements.
Standard Shimano-style cassette fit
Uses HG spline M fitment, so it works with many common 8-speed cassette freehub bodies already on older MTBs, hybrids and commuters.
Good upgrade path for older bikes
A practical option when you want lower gearing on an existing 8-speed bike instead of replacing shifters and the whole drivetrain.
General
Drivetrain
Features
Technology
Support
HYPERGLIDE
HYPERGLIDE is built to give you dependable, smooth shifting across the cassette, so your gear changes feel more consistent when the trail or commute turns steep.
Great for
Maybe not for
This is an 8-speed cassette with HG spline M fitment, not a 7-speed HG spline S cassette. It is listed for IG/HG 8/7/6-speed chains. Before buying, check that your rear derailleur is rated for a 40T largest sprocket and has enough total capacity for your front chainring setup.
vs microSHIFT Acolyte H-Series 8 Speed Cassette 11-42
The Acolyte 11-42 pushes a little more range and is built around microSHIFT’s dedicated 1x 8-speed ecosystem, but Shimano keeps a more familiar mainstream replacement path for many existing 8-speed bikes.
vs SunRace CSM703.8AZ 8-speed 11-46T
SunRace offers a much bigger climbing cog and publishes a 484 g weight, making it appealing for very steep terrain or heavy loads. Shimano is the more conservative choice if you want wide range without going to an extreme 46T low sprocket.
vs Shimano CS-HG41-8 11-34T
The CS-HG41-8 is the closer Shimano alternative if you want to stay 8-speed but keep a more traditional cassette size. The HG400-8 is the better pick when easier climbing matters more than tight gear spacing.
Check derailleur limits before you order
The biggest buying mistake with this cassette is assuming any 8-speed rear derailleur will handle a 40T sprocket. Count the teeth on your current largest cog and confirm your derailleur’s max sprocket rating before upgrading.
A great low-cost climbing upgrade
If your bike already has an 8-speed cassette hub, this can be a much cheaper way to get easier gears than moving to a new shifter, derailleur and cassette standard all at once.
Best suited to practical riding, not tight-ratio road use
This cassette makes the most sense on bikes used for hills, commuting, gravel paths and touring. Riders focused on smooth cadence jumps on fast road rides may prefer a smaller-range cassette.
Works well in refresh builds
For older hybrids and hardtails, pairing a new cassette with a fresh chain can bring back much cleaner shifting and extend the useful life of the bike.
Shimano is a Japanese component brand founded in 1921 in Sakai, Osaka. The company began with bicycle component manufacturing and has grown into a global business focused on bicycle components, fishing tackle and rowing equipment, while keeping its headquarters in Sakai.
In cycling, Shimano is best known for building complete component ecosystems that span road, mountain, gravel, commuting and e-bike use. Its range covers drivetrains, brakes, wheels, pedals, shoes and related parts, and the brand has had a long presence in Australia through a local business established in Sydney in 1992.
