Bestop Trektop Ultra Slantback Soft Top Black Twill Jeep Wrangler JL 4-Door | 54925-17

Overview

The Bestop Trektop Ultra Slantback Soft Top (Part # 54925-17) is the pinnacle of Jeep Wrangler JL soft-top engineering — combining the advanced weatherproofing technology of Bestop's Supertop Ultra with the sleek, coveted slantback (fastback) silhouette. Engineered exclusively for the 2018–2026 Jeep Wrangler JL 4-Door Unlimited, this premium black twill top delivers four distinct open-air configurations, one-person operation, and thermal performance that matches a factory hardtop. Whether you're searching for the best soft top for a 2024 Jeep Wrangler JL Unlimited or upgrading from a worn OEM top, the Trektop Ultra is the definitive long-term investment.

Key Features & Benefits

• Patented Guide-Track Flow-Back Technology — The entire top slides neatly into the rear cargo area via Bestop's patented guide-track system, giving you full open-air driving without removing the top entirely.
• 4-in-1 Versatility — Run it fully enclosed for all-weather protection, pop the Sunrider sunroof for a fresh-air cruise, go Safari-style bikini for the back half, or retract it completely for the ultimate topless experience.
• Patented Lift Assist System — Smooth, effortless operation designed specifically for one person, making the transition from fully retracted to Sunrider position quick and easy every time.
• Enhanced Sunrider Sunroof — The full-length Sunrider panel opens all passengers to open air simultaneously — not just the front row.
• Premium 30-oz Triple-Layer Black Twill Fabric — Heavy-duty acrylic twill provides a smooth, wrinkle-resistant finish with superior durability for off-road and daily driving. Mildew-resistant and treated with UV inhibitors for long-term fade resistance.
• Hardtop-Equivalent Thermal Performance — Engineered and tested to match factory hardtop cabin temperatures with an average variance of just half a degree — a remarkable achievement for a soft top.
• 40-Mil DOT-Approved Tinted Windows — Rear windows are made from 40-mil DOT-approved vinyl tinted to 18%, helping keep the interior cool while meeting all road-legal requirements.
• Zipperless Window Channels — Innovative zipperless channels make installing and removing the rear windows fast and frustration-free.
• JL 4-Door Exclusive Fitment — Every component is engineered specifically for the current-generation Wrangler JL 4-door platform. No compromises or adapters for older JK or TJ fitments.
• Limited Lifetime Warranty on Twill Fabric — Bestop backs the Premium Black Twill with a limited lifetime warranty, reflecting confidence in its long-term durability.
• Bestop Factory Pedigree — Bestop has been the factory original soft top supplier to Jeep since 1986, making them the most trusted name in Wrangler convertible tops.

What's Included

• Complete Trektop Ultra Slantback Soft Top Assembly
• Full bow and frame hardware kit
• Premium Black Twill fabric panels (top deck with header and latch assembly)
• 40-mil DOT-approved tinted vinyl rear window panels
• All mounting hardware (no drilling required)
• Installation instructions
• Access to Bestop's official installation video
• Note: Soft lower doors are NOT included and are sold separately. A window storage bag is recommended (sold separately).

Specifications

Manufacturer Part #	54925-17
UPC	077848139025
Brand	Bestop
Top Style	Slantback / Fastback
Fabric Material	30-oz Triple-Layer Acrylic Twill
Fabric Color	Premium Black Twill
Window Material	40-Mil DOT-Approved Tinted Vinyl
Window Tint	18%
Frame Included	Yes
Soft Lower Doors Included	No (sold separately)
Top Type	Complete Top Kit
Configuration Modes	4 (Fully Enclosed, Sunrider Open, Safari Bikini, Fully Open)
UV & Mildew Resistance	Yes
Fabric Warranty	Limited Lifetime (Twill)
Installation Difficulty	3 / 4 – Moderately Difficult
Estimated Install Time	4+ Hours
Drilling Required	No

Fitment & Compatibility

The Bestop Trektop Ultra (54925-17) is engineered exclusively for the 2018–2026 Jeep Wrangler JL 4-Door (Unlimited), including all trim levels: Sport, Sport S, Sahara, Rubicon, and Rubicon 392. This top is NOT compatible with the 2-door Wrangler JL, the older JK generation (2007–2018), or the Jeep Gladiator JT. Always verify your exact year and door configuration before purchasing.

• 2018 Jeep Wrangler JL Unlimited (all trims)
• 2019 Jeep Wrangler JL Unlimited (all trims)
• 2020 Jeep Wrangler JL Unlimited (all trims)
• 2021 Jeep Wrangler JL Unlimited (all trims)
• 2022 Jeep Wrangler JL Unlimited (all trims)
• 2023 Jeep Wrangler JL Unlimited (all trims)
• 2024 Jeep Wrangler JL Unlimited (all trims)
• 2025 Jeep Wrangler JL Unlimited (all trims)
• 2026 Jeep Wrangler JL Unlimited (all trims)

Installation

The Bestop Trektop Ultra mounts directly to your Wrangler JL's factory existing mounting points — no drilling required and no permanent modifications to your vehicle. All necessary hardware is included. Rated Moderately Difficult (3 out of 4) with an estimated installation time of 4+ hours. Professional installation is not required but is recommended for first-time installers. Bestop provides both a printed installation sheet and an official instructional video. Important: Install at ambient temperatures above 72°F — the fabric may contract by one inch or more in cooler conditions, which can cause initial fitment issues that will resolve within a few days after installation.

Frequently Asked Questions

Is the Bestop Trektop Ultra 54925-17 CARB compliant?
This is a soft top accessory and does not affect engine emissions systems, so CARB compliance is not applicable to this product.

Does the Trektop Ultra come with a warranty?
Yes. The Premium Black Twill fabric is backed by Bestop's limited lifetime warranty against defects in materials and workmanship.

Can one person install and operate the Trektop Ultra?
Yes. The patented Lift Assist system and Guide-Track mechanism are specifically designed for single-person operation from fully enclosed to fully retracted and back.

Does this top fit the Jeep Gladiator JT or 2-Door Wrangler JL?
No. Part number 54925-17 is engineered exclusively for the 4-door Jeep Wrangler JL Unlimited (2018–2026).