frame top tube is NOS Columbus Megatube Nivacrom EL [extra light
seatstays are NOS Reynolds 531C
lower part is made of Dedacciai Zero 25th anniversary steel tubing, including a large-diameter bi-oval down tube and very nicely thought-out chainstays that balance aerodynamics and wheel clearance well.’
RISE - 50 or 70mm (2 or 2.75in) of rise creates a more upright and comfortable riding position without the use of a highly angled stem or excessive headset spacers. This allows riders to achieve a more upright, relaxed fit while maintaining traditional drop-bar bike geometry.
CONTROL - Take advantage of the drops. The higher positioning of the drops provides a comfortable and secure hand position, giving you control to navigate rough terrain and steep descents. This keeps your body weight centered, while reducing neck and back strain.
BACKSWEEP - 7° degrees of backsweep orients the bar where your hands want to be. Whether you're on the flats, the hoods, or the drops, you're getting an ergonomic position for your most epic gravel rides.
FLARE - 25° degrees of flare and a compact drop means a stable, aerodynamic drop position that is actually comfortable enough to use on your longest gravel ride or your next bikepacking trip.
WIDE - 44, 47, and 50cm widths.
STORAGE - the unique double-bar construction provides room for all of your bar-mounted accessories. Mount handlebar bags (like our custom-fitted Top-Shelf Handlebar Bag which will be available summer 2024) securely, without flopping around like they do on a standard handlebar.
Perfect for road, gravel, bikepacking, and commuting.
Why are Your Handlebars Flared?
Our handlebars are designed to seek a balance between the traditional wide flat bars which offer stability and control over rough terrain and the comfort and speed of road bike drop bar position without sacrificing control. The Top Shelf Handlebars are flared in the drops to give the rider a stable and more controllable riding position that is essential for gravel biking terrain. This combination of comfort and control allows you to ride longer, further and faster and is especially well-suited to long distance multi-day, week or even months long bikepacking rides.
Width
44 cm
47 cm
50 cm
Weight (50 mm or 2 in version)
499 g
509 g
519 g
Weight (70mm or 2.75in version)
519 g
531 g
545 g
Sweep
7 deg
7 deg
7 deg
Drop Flare
25 deg
25 deg
25 deg
Drop
110 mm
110 mm
110 mm
Reach
70 mm
68 mm
65 mm
Clamp
31.8 mm
31.8 mm
31.8 mm
Material
6061 T6 Aluminum
Intended Use
ASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6").
Tumbleweed Sunliner Flat Bar Mountain Touring Bike
Frame Specs
Sizes: Small – Medium – Large – Extra Large
Tubing: Heat-treated, size-specific Cromoly tubing. Oversized triple and quad butted main triangle with integrated gussets
Colors: Forest Green or Rhubarb (dark pink). Both with gold Tumbleweed graphics
Tire Clearance: Optimized for 29×2.6”, clearance for up to 29 x 3 (Tested with WTB Ranger tire on 40mm internal rim width)
Head Tube Diameter: 44mm I.D. for ZS44 upper, EC44 lower cups
Bottom Bracket: 73mm BSA threaded
Spacing: Boost 148mm x 12mm thru axle (included)
Seat Post Diameter: 31.6
Seat Collar Diameter: 35mm (included)
Dropper routing: External routing on the down tube with internally routed seat tube
Driveline: 1x drivetrain specific. Not designed to accommodate a front derailleur
Chainring Clearance – 38 tooth max
Brake Compatibility – 180mm or 160mm IS mount, front and rear with external cable routing
Cage/Bottle mounts – 2 bolt/H2O mounts on seat tube (all sizes), one 3 pack on top of down tube (small only 2 bolt/H20 ), one 3 pack mount under down tube (all sizes)
