i have a 7 by 3 21 gear drivetrain right now. what do i have to do to figure out if this will work on my bike?

The cassette will not fit on a 7-speed hub. Replace the entire wheel with something compatible. Make sure the axle spacing matches your frame. You will also need to make this a 1 x 11. If you want to do a 2x11, get the option with the 11-42 tooth cassette. If you opt for the 2x11 , I would recommend the removal of the outer chainring, replace it with a chain guard to take up the outer step on the spider and protect your calf. This will give you a 32x11 top gear and a 22x46 low gear (I am assuming your crankset is a 22/32/42). If you opt for the 1x, you should just get a new crankset. An inexpensive one with a square taper should do the trick. I would suggest a 28 to 32 tooth front sprocket. Your choice depends on the terrain you plan to ride and your fitness. I noticed a response that says you need an XD adapter. I do not think this is the case. Get a Shimano 10/11/12 compatible hub and this cassette should slide right on.

What chain do you recommend for this cassette ?

must use any 11 speed chain and 116L long. thanks. KMC/shimano/sram whatever,

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🚵‍♂️ Elevate your ride with precision and power—don’t just ride, dominate the trail!

TRUSTED BRAND SYNERGY - Built with Shimano, KMC, and Sunrace components for proven durability and smooth operation—join the community of savvy riders who demand more.
WIDE RATIO CASSETTE POWER - Tackle steep climbs and fast descents effortlessly with the expansive 11-51T cassette range, engineered for all-mountain versatility.
PLUG AND PLAY INSTALLATION - Standard clamp-on mounting means you’re trail-ready in no time—upgrade your drivetrain without the hassle.
SEAMLESS 11 SPEED SHIFTING - Experience crisp, reliable gear changes with Shimano’s M5100 shifters and derailleur—perfect for conquering any trail.
COST EFFECTIVE PERFORMANCE BOOST - Upgrade from 8, 9, or 10-speed setups without breaking the bank, combining Shimano’s tech with a durable KMC X11 chain.

The JGbike Compatible MTB Groupset is a 2020 release featuring Shimano M5100 11-speed shifters and rear derailleur, paired with a wide-range 11-51T cassette and a durable KMC X11 chain. Designed for easy clamp-on installation, it upgrades older 8-10 speed drivetrains with smooth, reliable shifting and enhanced climbing performance, making it an affordable, high-value choice for all-mountain cyclists.

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Mounting type	Clamp-On Mount
Number of teeth	51
Manufacturer	JGbike
Bike Type	All Mountain
Color	Shimano M5100+KMC 126L
Size	11-51T Silver
Material Type	Aluminum
Sport	Cycling
Batteries Included?	No
Item model number	M5100-CSM5100-51T
Package Dimensions	21.8 x 21.6 x 14.2 cm; 1.62 kg
ASIN	B08CZ4LGZF

JGbike Compatible MTB groupset for Shimano M8000 M7000 M5100 11 Speed shifters & Rear Derailleur, KMC X11 Chain,Sunrace 11-46T CSMS8 11-50T CSMX80, Shimano CSM8000/M5100 51T Cassette

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