Profile Design Sonic Ergo 39a Clip-On Aerobar 400mm
SKU code: BCP-RHSNC391
In Stock
The Sonic/Ergo/39a pairs Profile Design's lightest current bracket with its Ergo armrest and 39a aluminium extensions. It's designed to present minimal frontal area while giving a wide fit range, so you can set up for both speed and comfort.
Highlights
- Sonic bracket: extensive fit range, low weight, minimal frontal area
- 100 armrest positions, 1500 configurations with risers
- Ergo armrests with 10 mm pads, flippable for finer steps
- 39a extensions: 39° grip, 87 mm rise, 7.5 mm lateral shift per side
- Extension length and rotation adjusted with the top bolt
Fit range
Armrest offset runs from -70 mm to -17.5 mm in 7.5 mm steps, and armrest width from 124 mm to 290 mm in 18.5 mm steps (measured with the extensions at 100 mm). Minimum armrest stack is 60 mm; Profile Design's riser kits add up to 70 mm, for 130 mm of stack in 5 mm increments. As a clip-on bar, extension width and tilt are also easy to adjust.
For comparison, Profile Design's previous top clip-on, the J4/F35, offered 90 configurations.
The bracket and armrests
Profile Design brought the fit options of its Supersonic to the Sonic by simplifying the extension clamp and moving the wing forward to the bar centreline, which also makes the Sonic its lightest current bracket. The Ergo armrest flips: swap sides or rotate it for smaller increments, which makes it simple to fine-tune a position or match your previous bike.
The extensions
The 39a extensions have a 39° grip. Hold high for a shrugged position or low for a more open, head-up position. They're 6061-T6 aluminium, 400 mm long, pre-drilled for rear-exit bar-end shifter routing, and work with electronic or mechanical shifters.
Compatibility & fit
Clamps a 31.8 mm handlebar, or 26.0 mm with Profile Design's shim kit (sold separately). Extensions are 22.2 mm OD. All bolts are M6: bar clamp 6 Nm, extension clamp 6 Nm, armrest bolts 4.7 Nm. Follow Profile Design's Sonic Ergo installation instructions.
Aerobar fitting and position set-up is a separate workshop service and isn't included in the price. Our workshop can fit the extensions, cut them to length and set up your position.
Profile Design warrants this product to the original retail purchaser against defects in materials and workmanship for two years from the date of original retail purchase. The warranty does not cover products that have been modified, misused, involved in a crash or impact, or damaged by improper assembly or by failing to follow the installation instructions.
This cover is in addition to your rights under the Australian Consumer Law. Keep your proof of purchase.
For warranty support, return the product to Tune Cycles and we'll manage the claim with Profile Design's Australian distributor.
- Sonic bracket, Profile Design's lightest current bracket
- Armrest offset -70 to -17.5 mm, width 124–290 mm
- Stack 60 mm, up to 130 mm with riser kits
- Ergo armrests, 10 mm pads
- 400 mm 39a aluminium extensions, 39° grip, 87 mm rise
- Rear-exit routing, electronic or mechanical shifters
| Bracket | Sonic |
|---|---|
| Armrest | Ergo, 10 mm pads |
| Handlebar clamp | 31.8 mm (26.0 mm with shim kit, sold separately) |
| Armrest offset | -70 mm to -17.5 mm in 7.5 mm steps |
| Armrest width | 124–290 mm in 18.5 mm steps (extensions at 100 mm) |
| Armrest stack | 60 mm minimum; up to 130 mm with riser kits (sold separately) |
| Extensions | 39a, 6061-T6 aluminium |
| Extension length | 400 mm |
| Extension angle | 39° |
| Extension rise | 87 mm (bottom to top) |
| Extension offset | 15 mm total |
| Extension diameter | 22.2 mm OD, 19.2 mm ID |
| Shifter compatibility | Electronic or mechanical |
| Bolts and torque | All M6; bar clamp 6 Nm, extension clamp 6 Nm, armrest bolts 4.7 Nm |
| Colour | Anodised matte black |
| Weight (brand-listed) | Bracket 234 g, armrest 130 g, extensions 222 g/pair |
| SKU | BCP-RHSNC391 |
| Model # | RHSNC391 |
| Barcode # | 0723660011482 |
| Brand | Profile Design |
