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Vaast Bikes Japan

A/1 GRX 1x 700c - Berry Red

A/1 GRX 1x 700c - Berry Red

Regular price ¥468,000 JPY
Regular price Sale price ¥468,000 JPY
Sale Sold out

VAT to be collected upon delivery


The A/1 GRX 700c offers a more premium 1x setup and a faster rolling 700c wheelset perfect for riders with a need for more speed across a wide range of riding and desire the benefits of the Shimano GRX groupset's renowned smoothness.

The geometry of the A/1 enables the bike to be both a comfortable gravel grinder and an efficient and fast grand tourer. Well-placed braze-on mounts make it easy to add on racks and fenders in front or in back for safe and dry commutes.

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A/1 GRX 700c size & spec

A/1 Sizing Chart

 A/1 Frameset X-Small Small Medium Large X-Large
R - Reach 356 365 380 395 410
S - Stack 514 536 563 595 620
TR - True Reach 430 439 455 471 486
TS - True Stack 566 588 615 647 672
2 - Top Tube Length 518 534 557 583 605
3 - Wheelbase 998 1008 1023 1038 1061
4 - Chainstay Length 425 425 425 425 425
5 - Front Center 582 592 607 623 645
6 - BB Drop 68 68 68 68 68
7 - Seat Tube Angle 72.5 72.5 72.5 72.5 72.5
8 - Head Tube Angle 69.5 70 71 72 72
9 - Seat Tube Length 500 520 540 560 580
10 - Head Tube Length 95 115 140 170 195
11 - Standover Heigth 754 774 797 821 841
12 - Seat Tube Length IN. 19.7 20.8 21.6 22.4 23.2

A/1 GRX 700c Specification

Frame Allround-Allroad 700c/650b disc -   AE81 ALLITE Super Mag - VAAST Allroad geometry - internal cable routing - dropper post ready. Rack and fender ready
Frame Weight 1300g
Fork VAAST Allround-Allroad full-carbon disc - rack & fender ready
Tires Maxxis Rambler 700 x 38mm 120tpi, EXO/Tubeless Ready w/Lightweight tubes
Max Tire Clearance 650b, 50mm / 700c, 42mm
Rims Stan's Notubes Grail S1 w/Stan's tubeless rim tape
Rotors Shimano Centerlock 160mm
Crank Praxis Zyante carbon 42T w/ M30 axle
Cassette Shimano 11-42 11-speed
Shifters Shimano GRX ST-RX600
RD Shimano GRX - RD-RX812
FD n/a
Chain KMC X11 Anti Rust
Brakes Shimano GRX RX600 Hydraulic
Bottom Bracket Praxis T47 IB Enduro Bearings
Hub F Sealed cartridge bearing, 12 x 100mm thru axle, Centerlock, 28H
Hub R Sealed cartridge bearing, 11-speed, 12 x 142mm thru axle, Centerlock, 28H
Spokes Double butted stainless
Axles VAAST M12
Handlebar VAAST Allroad Pro, butted 6061 aluminum
Stem VAAST Allroad Pro, 3D forged, 6 degree
Grips / Tape VAAST Anti Slip
Seat Post VAAST Carbon fiber 27.2mm (300mm)
Saddle WTB Silverado 142 Comp


VAAST Bikes is the first to use ALLITE® SUPER MAGNESIUM™, a true innovation in material science. This high-strength alloy features excellent shock absorption properties, weighs 33% less than Aluminum and 50% less than Titanium by volume, and is significantly stronger than both.

Through the exclusive use of this eco-friendly metal, we have achieved a ride that feels like no other.


The Model A/1 supports both 650b and 700c with a frame, with 700c wheels and room for up to 42mm tires. While the switching to 650b wheelset will offer extra room up to 50c.

It is just a tire swap away and has been designed for riders who want the perfect blend of gravel capability without giving up anything on paved road group rides or their daily commute.


The A/1 encourages you to go further yet stay comfortable and confident. The longer wheelbase and lowered bb drop compared to traditional road bikes are to give you more stability and handling in tactical terrain.

While the relaxed geometry is an art that combines endurance ride, gravel ride, and bike touring, all in one frame.