Build

COMPONENTS

Brakes  

Drivetrain

• Cassette

• Crankset & bottom bracket

• Derailleur

• Shifters and brake levers

Fenders 

Handlebars & stem

• Handlebars

  • Bar tape

• Stem

Seatpost 

Saddle

Wheels & tires

• Wheels

• Tires

COMPONENTS

Brakes [flat-mount brakes front and rear: 140mm (160mm max - adaptors available separately) (frame flat-mount bracket height: 10mm)

• • GRX 820

    • • BR-RX820 (x2) (weight - rear: 135g; front: 146g) [~$84 rear; $90 front] 

        • • Recommended disc brake rotors (x2): RT-CL800 (140mm) (weight: 97g)

  • For GRX 610 (GRX 400)

    • • BR-RX400 (x2) () [~$55 each]

        • • Recommended disc brake rotors (x2): SM-RT64 (140mm) (weight: ?g)

Drivetrain (Shimano GRX 1x 12 Speed (Unstoppable): 40 X 10-51 = 21-108 gear inches)

• Cassette

  • CS-M8100-12 (10-51T) (Deore XT) (10-51T) (weight: 470g; weight savings: 64g) [~$165]

  • OR: CS-M7100-12 (SLX) (10-51T) (weight: 534g) [~$100]

  • OR: Garbaruk 12 Speed (Shimano Microspline freehub) (10-52T) (check for compatible derailleurs)

• Chain

  • CN-M6100 (HG 12-speed) (weight: 252g) [~$15]

• Crankset & bottom bracket (Bottom bracket: 68mm - English threaded)

  • FC-RX820-1 (GRX 820): 1x12-speed; 40T chainring) (crank arm lengths: 170, 172.5, and 175 [?]) (weight: 644g; weight savings: 168g) [~$250]

    1. • Recommended bottom bracket: SM-BBR60 (Ultegra) (threaded shell width: 68/70mm) (weight: 77g; weight savings: 16g) [~$30]

  • FCRX610-1 (GRX 610): 1x12-speed; 40T chainring) (crank arm lengths: 165, 170, 172.5, and 175 [?]) (weight: 812g) [~$?]

    1. • Recommended bottom bracket: BB-RS501 (Tiagra) (threaded shell width: 68/70mm) (weight: 93g) [~$20]

• Derailleur: RD-RX822-SGS [compatible with 10-51T; capacity: 41T] [~$125]

• Control levers: 

• • GRX 820

    • Right: CST-RX820-R (weight: 289) [~$300]

      • • Brake lever/brake hose (kit): SM-BH90-JK-SSR [~$35]

        • Recommended brake caliper BR-RX820 (see above)

    • Left: BL-RX820-L (weight: 222) [~$250]

      • • Brake lever/brake hose (kit): SM-BH90-JK-SSR [~$35]

    • Recommended brake calipers and rotors: BR-RX820 & RT-CL800 (see above)

  • GRX 610

    • Right: ST-RX610-R (weight: 543g/pair)

      • • Brake lever/brake hose (kit): SM-BH90-JK-SSR [~$35]

        • Recommended brake caliper: BR-RX400

    • Left: BL-RX610-L (weight: 543g/pair)

      • • Brake lever/brake hose (kit): SM-BH90-JK-SSR [~$35] 

        • Recommended brake caliper: BR-RX400

    •  Recommended brake calipers and rotors: BR-RX400 &

Fenders [Frame max spacing 58mm; Fork max spacing 60mm]

• Velo Orange 650b Smooth Fenders, 58mm - Silver or Noir ($95) (weight)

• Verification?

Handlebars & stem

• Handlebars

  • Width?

• Stem (1-1/8" straight steerer; 30mm maximum spacers below stem)

  • Length?

  • Redshift

Seatpost (27.2mm)

• Redshift

• Thudbuster

Wheels & tires

• Wheels

  • • Rims: 

      • Astral Polished Silver Outback Rim, Alloy, 650b (External width = 28mm; internal width = 25mm; height = 23mm) (spokes count: 28) (weight: 460g)

      • Or: Velocity Blunt SS (650b) (External width = 30mm; internal width = 26.6mm; height = 20mm) (spokes 28 or 32) (weight = 395g) 

    • Hubs: 

      • Onyx

        • • Rear: Onyx Vesper Rear Hub (MTB CL MS 142/12) (142mm spacing; 12mm TA) (Spoke count: 24, 28, 32) (374g) [$485]

          • Front: Onyx Vesper Front Hub (MTB CL 100/12) (100mm spacing; 12mm TA) Spoke count: 24, 28, 32 (156g) [$250]

            • Total price: $735

      • White Industries CLD

        • • Front (100mm; 12mm TA; Shimano Microspline) (145g) [$195]

          • Rear (142mm; 12mm TA; Shimano Microspline) (256g) [$383]

            • Total price: $578

• Tires

  • 650B x 48 Switchback Hill TC Tire (smooth) (Standard casing: Tan sidewalls; weight = 447g) (Endurance casing: Dark tan sidewalls; weight = 513g)

  • 650B x 42 Babyshoe Pass TC Tire (smooth) (Standard casing: Tan sidewalls; weight = 402g) (Endurance casing: Dark tan sidewalls; weight = 432g)

  • WTB Horizon  

  • Teravail  

Racks and bags

Bar tape:  https://sites.google.com/site/njbbicycling/shopping/accessories/bar-tape  

Brooks Microfiber Bar Tape - Honey ($35): https://www.brooksengland.com/en_us/microfibre-bar-tape.html 

Saddle

Blue Lug WTB

WTB* pure-V race saddle BL special (brown): https://global.bluelug.com/wtb-pure-v-race-saddle-bl-special-brown.html 

Bags

Handlebar

• For sunglasses and camera

• Relatively easy entry

• Needs to be relatively small

• I would prefer it not take up make space on the bars

Half frame bag

• Ortlieb

Saddlebag

x

Handlebar bag

Ortlieb Accessory Pack

• https://www.ortlieb.com/usa_en/accessory-pack+F9953 

Route Werks bag: https://routewerks.cc/products/the-handlebar-bag 

https://granfondo-cycling.com/route-werks-handlebar-bag-review 

https://www.youtube.com/watch?v=Co4lWe1z9Cs&ab_channel=GravelCyclist 

https://www.youtube.com/watch?v=34ym9iPR1dM&ab_channel=PathLessPedaled 

THINGS TO FIGURE OUT

Wheels

Tires

Crank arm length

Handlebars and stem: I have handlebars I can use initially. I could get a cheap stem to begin with, and then get a bike fitting. 

Seatpost: Dropper post? This affects shifter selection. I have seatposts and a saddle I can use initially.   

Bags

Building the bike

Installing the Bottom bracket, crankset, cassette, derailleur and chain (need wheels for this)

Installing the brakes (need wheels for this)

Installing the shifters and cables (need handlebar for this)

--

I can install the seatpost. 

Cyclepath PDX custom builds: https://www.cyclepathpdx.com/articles/service-repair-pg186.htm