680mm Carbon Handlebars 31.8mm Riser Bars - Lightweight MTB Flat Bar

In this review of the 680mm Carbon Handlebars from RXL SL, the bottom line is simple: these bars are for riders who want a lightweight, stiff flat bar that improves control and encourages a more upright riding position. The reviewer found the bar's carbon construction and anodized finish deliver a noticeable weight saving and a solid feel under load, which is especially useful for riders upgrading from alloy bars or those trimming grams without sacrificing durability. This review focuses on real ride impressions, fit notes, and who will benefit most from this flat carbon bar.

Key Features

• Carbon fiber construction: High-strength carbon offers a lightweight and stiff platform that reduces weight while holding firm under braking and rough terrain.
• Anodized finish: The anodized surface adds abrasion resistance and a clean look that keeps the bar durable through normal wear.
• Comfortable upright position: The flat riser profile encourages a more upright posture that reduces stress on the back, arms, and neck during longer rides.
• Improved control: Extra handgrip and a straight, predictable bend make steering and brake modulation easier for beginners and experienced riders alike.
• Shock absorption: Carbon layup provides non-slip and shockproof characteristics that help smooth out chatter on gravel and rough trails.
• Simple installation: The 31.8mm clamp diameter matches common stems and is easy to fit when the correct stem diameter is confirmed.

Who It's For

This bar suits cross-country and trail riders who want to shave weight while maintaining a solid, confidence-inspiring cockpit. Riders upgrading from alloy bars will notice reduced weight and a crisper feel, and commuters who prefer a more upright position will appreciate the ergonomic benefits.

It is not ideal for riders who need extreme rise or swept backs not offered by a flat riser profile, or for those who are uncertain about stem clamp compatibility; measuring the stem to ensure a 31.8mm fit is required before ordering.

Pros & Cons

Pros

• Lightweight carbon construction reduces overall bike weight without a hollow feel.
• Stiffness and firmness deliver confident braking and precise steering inputs.
• Comfortable for an upright position, easing strain on back and neck over longer rides.
• Appealing anodized finish and modern look that customers report as high quality and durable.

Cons

• Carbon layering receives mixed feedback, so riders expecting visible uniform layup may notice variations in finish.
• Must confirm 31.8mm stem diameter before purchase to avoid fit issues.

Specifications

Material	High-strength carbon fiber
Clamp diameter	31.8mm
Available widths	680mm, 700mm, 720mm, 740mm, 760mm
Finish	3K matt glossy with anodized treatment
Handlebar type	Flat riser MTB handlebar
Fit note	Install with a 31.8mm stem

Our Verdict

The 680mm RXL SL carbon handlebar is a sensible upgrade for riders who want a lighter, stiffer flat bar that improves handling and encourages a more upright ride position. Its combination of carbon construction, anodized finish, and straightforward fit makes it good value for riders replacing alloy bars or trimming weight, provided they check stem compatibility first.

Frequently Asked Questions

Do these bars fit a standard 31.8mm stem?
Yes, these handlebars are designed for a 31.8mm clamp diameter and must be paired with a 31.8mm stem for safe installation.

Are they suitable for trail riding?
Yes, the bars are stiff and shockproof enough for cross-country and moderate trail use, offering improved control on bumpy surfaces.

Do they save much weight compared with alloy bars?
Customers reported noticeable weight savings and a firmer feel; one user noted an 80g saving which improved overall bike weight.