Shimano GRX 12 Speed (Unstoppable) [RX820]
DERAILLEUR [RD-RX822-SGS) ($127)
Rear derailleur: RD-RX822-SGS [compatible with 10-51T, 12-speed SHIMANO MTB cassette; chain tensioner has an ON/OFF switch for easy wheel removal; Adjustable chain stabilizer prevents chain slap and drops; SHIMANO SHADOW RD+; Total capacity: 41T; Interchangeable, replaceable GS/SGS derailleur cage] [$127] 288g
CASSETTE (CS-M8100-12) ($165)
Cassette: CS-M8100-12 (10-51T) SHIMANO DEORE XT (Microspline): VIEW PRODUCT; Average weight 470 (10-51T); $165; 10-12-14-16-18-21-24-28-33-39-45-51T
CRANKSET (FC-RX820-1 or FCRX610-1) (820 = $250)
Ritchey Outback requires: Bottom bracket 68mm - English threaded
FC-RX820-1 - SHIMANO GRX - Gravel Crankset - 1x12-speed VIEW PRODUCT [40 or 42T] [170, 172.5, and 175 mm crank arm lengths] [weight: 644 (40T); 656 (42T)] [110 BCD] [$250]
[Chain line (mm): 49.7] [P.C.D. (mm): 110] [Q-factor (mm) 151]
[Recommended bottom bracket|Threaded (normal): SM-BBR60] [Threaded bottom bracket shell width (mm)| 68 or 70] [Compatible chain: HG 12-speed chain] (weight: 77g)
??? https://www.wolftoothcomponents.com/products/110-bcd-asymmetric-4-bolt-for-shimano-cranks
CHAIN (CN-M6100) ($15)
HG 12-speed chain: CN-M6100: https://bike.shimano.com/en-EU/product/component/deore-m6100/CN-M6100.html (weight: 252g)
CONTROL LEVERS (820)
CST-RX820-R: SHIMANO GRX Hydraulic Disc Brake DUAL CONTROL LEVER 12-speed VIEW PRODUCT; Weight: 289; Brake lever|Recommended brake caliper BR-RX820
BL-RX820-L: SHIMANO GRX - Hydraulic Disc Brake Lever VIEW PRODUCT; Weight: 222; $385 / $232
ST-RX820-LA: Dropper post: 263g; $225
Weight: 289 + 222 = 511 pair
40 X 10-51 = 21-108
Weight & cost difference between 820 and 610
Weight difference = 347g = .77 lb
Cost difference = $330
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CASSETTE (CS-M8100-12) ($165)
Cassette: CS-M8100-12 (10-51T) SHIMANO DEORE XT (Microspline): VIEW PRODUCT; Average weight 470 (10-51T); $165; 10-12-14-16-18-21-24-28-33-39-45-51T
Cassette alt: CS-M7100-12; SLX 12-Speed MTB Cassette Sprocket VIEW PRODUCT; $100. Average weight 534 (10-51T); 10-12-14-16-18-21-24-28-33-39-45-51T
Weight difference: 534 - 470 = 64g
Cost difference: 165 - 100 = 65
CRANKSET (FC-RX820-1 or FCRX610-1) (820 = $250)
FC-RX820-1 - SHIMANO GRX - Gravel Crankset - 1x12-speed VIEW PRODUCT [40 or 42T] [170, 172.5, and 175 mm crank arm lengths] [weight: 644 (40T) [$250]
FC-RX610-1 - SHIMANO GRX - Gravel Crankset - 1x12-speed VIEW PRODUCT [38 or 40T] [165, 170, 172.5, and 175 mm crank arm lengths] [weight: 812 (40T)] [$150]. Recommended bottom bracket|Threaded (normal): BB-RS501 (Tiagra) (weight = 93g)
Weight difference (184g = .4 lb): 820 (644 + 77 = 721) versus 610 (812 + 93 = 905)
Cost difference: $100
CONTROL LEVERS (820)
CST-RX820-R: SHIMANO GRX Hydraulic Disc Brake DUAL CONTROL LEVER 12-speed VIEW PRODUCT; Weight: 289; Brake lever|Recommended brake caliper BR-RX820
BL-RX820-L: SHIMANO GRX - Hydraulic Disc Brake Lever VIEW PRODUCT; Weight: 222; $385
Weight: 289 + 222 = 511 pair
CONTROL LEVERS (610)
ST-RX610-R: SHIMANO GRX Hydraulic Disc Brake DUAL CONTROL LEVER 12-speed VIEW PRODUCT; Weight: 610 /pair); Brake lever|Brake hose (kit) SM-BH90-JK-SSR; Brake lever|Recommended brake caliper: BR-RX400 $230
BL-RX610-L: SHIMANO GRX - Hydraulic Disc Brake Lever VIEW PRODUCT; Weight: 543 (ST-RX610-R+BL-RX610-L) $200
Weight: 610 pair
CONTROL LEVERS DIFFERENCE
820 vs 610: 610-511 = 99g
Cost difference: ($310 +285 = 595) (430) = 165
WEIGHT SAVINGS 800 vs 610
Cassette: Weight difference: 534 - 470 = 64g
Crankset & bottom bracket: Weight difference (184g = .4 lb): 820 (644 + 77 = 721) versus 610 (812 + 93 = 905)
Control levers: 820 vs 610: 610-511 = 99g
64 + 184 + 99 = 347g = .77 lb
COST DIFFERENCE
65 + 100 + 165 = 330
SHOPPING
Bottom bracket: SM-BBR60 (threaded 68mm)
Crankset: FC-RX820-1 (40T)
Cassette: CS-M8100-12 (10-51T)
Derailleur: RD-RX822-SGS
Control lever – right: ST-RX820-R
Control lever – left BL-RX820-L (ST-RX820-LA: Dropper post)
Chain: CN-M6100 (HG 12-speed chain)
Brake caliper - front : BR-RX820 - Front
Brake caliper - rear: BR-RX820 - Rear
Rotors: RT-CL800 (140mm) [x2]
Brake hose kit "SM-BH90-JK-SSR [x2]
Brake fluid Shimano hydraulic mineral oil (100ml)
Two Hoosiers
$1249
Kit Includes:
Qty 1 Shimano GRX BL-RX820 Brake Lever with BR-RX820 Hydraulic Disc Brake Caliper - Left/Front, Flat Mount Caliper
Qty 1 Shimano GRX ST-RX820 Shift/Brake Lever with BR-RX820 Hydraulic Disc Brake Caliper - Right/Rear, 12-Speed, Flat Mount Caliper, For 25mm Mount
Qty 1 Shimano GRX FC-RX820-1 Crankset - 170mm, 12-Speed, 40t, 110 BCD, Hollowtech II, Black
Qty 1 Shimano GRX RD-RX822-SGS Rear Derailleur - 12-Speed, Direct Mount, Long Cage, Shadow Plus Design, 51t Max Low
Qty 1 Shimano XT CS-M8100 Cassette - 12-Speed, 10-51t, Silver/Black, Micro Spline
Qty 1 Shimano XT CN-M8100 Chain - 12-Speed, 138 Links, Silver
Kit Does NOT Include:
Rotors (Can be purchased separately)
Bottom Bracket (Can be purchased separately)
$1200
1x Shimano CN-M8100 12S chain
1x rear derailleur Shimano GRX RD-RX822-SGS 12S
1x Shimano GRX BL-RX820-L + BR-RX820 1S left-hand shifter
2x Shimano RT-MT800 160mm centre lock discs with outer ring nut
1x right-hand shifter Shimano GRX ST-RX820-R + BR-RX820 12S
Does not include brake calipers