Shimano

Shimano GRX 12 Speed 1x ("Unstoppable"): 40 or 42 chainring; 10-51 cassette; 40T chainring: Gear inches (650B x 50mm): 40T X 10-51 = 21-108; Gear inches (650B x 50mm): 42T X 10-51 = 22-113

https://bikepacking.com/gear/shimano-grx-12-speed-review/

Shimano GRX 10 speed 2x (RX400): (650b X 50mm) (46/30 X 11-36): 22-113 gear inches

GRX

https://gravel.shimano.com/us

Shimano gravel groupset ranking

GRX RX400: 10-speed
GRX RX600: 11-speed (apart from 10-speed version of crank)
GRX RX810: 11-speed
GRX RX815: 11-speed electronic
12 Speed - Unstoppable

https://gravel.shimano.com/us/

https://bike.shimano.com/en-US/product/component/grx.html

https://bike.shimano.com/content/dam/productsite/shimano-northamerica/pdf/GRX%20DOC%20CONSUMER.pdf

GRX RX400: 10-speed

https://bike.shimano.com/en-EU/product/component/grx-10-speed.html

GRX-400 is a mostly complete groupset, but doesn't have its own cranksets.

FC-RX600-10 - SHIMANO GRX Gravel Crankset 2x10-speed (46/30) VIEW PRODUCT

CS-HG50-10 - SHIMANO 10-Speed 11-36T MTB Cassette Sprocket VIEW PRODUCT

ST-RX400-L - SHIMANO GRX Hydraulic Disc Brake DUAL CONTROL LEVER 2x10-speed VIEW PRODUCT

RD-RX400 - SHIMANO GRX Rear Derailleur 10-speed VIEW PRODUCT

FD-RX400 - SHIMANO GRX Front Derailleur 2x10-speed VIEW PRODUCT

Disc Brake Calipers

GEAR INCHES (650b X 50mm) (46/30 X 11-36): 22-113

GEAR INCHES (700c X 45mm): = 23.3-111

Rear Derailleur RD-RX400

Wide range front gearing

Maximum front T difference: 16T

Top sprocket: Max. 11T/Min. 11T

Low sprocket: Max. 36T/Min. 32T

Total capacity: 41T

https://www.bike24.com/p2342416.html

GRX RX600: 11-speed

https://gravel.shimano.com/us/products/gravel/600-series/

Crankset 2X11 (46/30): FC-RX600-11: https://bike.shimano.com/en-US/product/component/grx-11-speed/FC-RX600-11.html

Cassette: 11-34

GEAR INCHES (650b X 45mm): = 23.3-111

GEAR INCHES (700c X 45mm): = 24.7-111

GRX RX800: 11-speed

https://gravel.shimano.com/us/products/gravel/800-series

Crankset 2X11 (48/31):

Cassette: 11-34

GEAR INCHES (650b X 45mm): =

GEAR INCHES (700c X 45mm): =

https://bike.shimano.com/en-EU/product/component/grx-di2.html

https://bike.shimano.com/en-US/product/component/grx-di2.html

https://bike.shimano.com/en-US/product/component/grx-di2/CS-HG800-11.html

11-34

https://gravel.shimano.com/us/products/gravel/600-series/

Crankset 2X11 (46/30): FC-RX600-11: https://bike.shimano.com/en-US/product/component/grx-11-speed/FC-RX600-11.html

46/30 X 11-34 = 23-111 gi

https://gravel.shimano.com/us/products/gravel/800-series/

48/31

FC-RX810-2

RD-RX810 https://bike.shimano.com/en-US/product/component/grx-11-speed/RD-RX810.html

Want even lower gears? So-called ‘mullet’ builds mix a road chainset and shifters with a mountain bike rear derailleur and cassette for an ultra-low gear range.

Using Shimano’s electronic Di2 components, you can pair GRX shifters with an XTR or Deore XT Di2 MTB rear mech. Both MTB derailleurs can handle a 11-42t cassette in double-chainring configuration, or 11-46t with a single chainring.

https://www.swisscycles.com/the-ideal-tour-divide-drivetrain-ultra-wide-range-grx-2x11/

https://bikepacking.com/gear/guide-to-mullet-drivetrains/

Shimano’s most compact GRX gravel double crankset (30/46T) paired with an 11-34T cassette and the same 700c x 45mm tires still only gets you a bailout gear with about 25 gear inches.

25-110

Specialized Diverge Elite

GRX RX400 and RX600 - 10 speed

46/30 X 11-36 = 22-111 GI

See: https://www.specialized.com/us/en/diverge-elite-e5/p/199974?color=322134-199974

DRIVETRAIN

Shift Levers - Shimano GRX RX400 hydraulic brake levers, 2x10 speed mechanical shifting
Front Derailleur - Shimano GRX RX400, braze-on
Rear Derailleur - Shimano GRX RX400, 10-speed
Cassette - Shimano CS-HG50-10, 10-Speed 11-36t
Crankset - Shimano GRX RX600
Chainrings - 46/30T
Bottom Bracket - Shimano 68mm threaded
Chain - KMC X10, 10-speed w/ reusable Missing Link™

RD-RX400: https://bike.shimano.com/en-EU/product/component/grx-10-speed/RD-RX400.html

Wide range front gearing

Maximum front T difference: 16T

Top sprocket: Max. 11T/Min. 11T

Low sprocket: Max. 36T/Min. 32T

Total capacity: 41T

12 Speed - Unstoppable

https://gravel.shimano.com/us/campaign/grx-12-speed

RX820 1x12

10-51 cassette; 40T chainring

Gear inches (650B x 50mm): 40T X 10-51 = 21-108

Gear inches (650B x 50mm): 42T X 10-51 = 22-113

Rear derailleur: RD-RX822-SGS
Cassette: CS-M8100-12 (10-51T)
Front chain line combination:FC-RX820-1 (42T, 40T)

Hood Shape Optimized for Flared Handlebars With a rounded profile, the new GRX RX820 hood shape distributes pressure over more of your hand, ensuring long-range comfort.

https://bike.shimano.com/en-US/product/component/grx-12-speed.html?filterCatId=cg4SHICShiftBrakeLeverRoadUrbanHydraulicDiscBrake,cg4SHICBrakeLeverHydraulicDiscBrake,cg4SHICBrakeHydraulicDiscBrake,cg4SHICDiscBrakeRotor

ST-RX820-R

SHIMANO GRX Hydraulic Disc Brake DUAL CONTROL LEVER 12-speedVIEW PRODUCT

ST-RX610-R

SHIMANO GRX Hydraulic Disc Brake DUAL CONTROL LEVER 12-speedVIEW PRODUCT

BL-RX820-L

SHIMANO GRX - Hydraulic Disc Brake LeverVIEW PRODUCT

BL-RX610-L

SHIMANO GRX - Hydraulic Disc Brake LeverVIEW PRODUCT

ST-RX820-LA

SHIMANO GRX - Hydraulic Disc Brake Lever - Dropper Post OperationVIEW PRODUCT

Shimano GRX 10 Speed 2x (400/600)