Maximum Crossbar Spread Permissible to Mount Thule Ascent 1500 Roof Box, Part # TH603
Question:
What is the maximum distance for crossbars to mount the Thule Ascent 603 1500 Roof Box,
asked by: Mitchell
Expert Reply:
This particular Thule Ascent Cargo Box, part # TH603, is discontinued and is no longer available. My contact at Thule advises that the maximum crossbar spread to mount this box is 33-1/2 inches and that this box used the QuickGrip mounting system.
We do offer replacement QuickGrip mounts if you need these. The QuickGrip assembly is part # TH05738; and the replacement mounting screw is part # TH05728.

Products Referenced in This Question
Replacement Quick Grip Mount Assembly - Thule Ascent, Atlantis, and Force Cargo Box - Qty 1
- Accessories and Parts
- Roof Box
- Mounting Hardware
- Thule
more information >
Product Page this Question was Asked From
Replacement Quick Grip Mount Assembly - Thule Ascent, Atlantis, and Force Cargo Box - Qty 1
- Accessories and Parts
- Roof Box
- Mounting Hardware
- Thule
more information >
Continue Researching
- Q&A: Can Quick Grip Mounting for Thule Atlantis 1800 Be Opened up for Servicing
- Q&A: Replacement Parts for Thule Atlantis 1600XT Cargo Box
- Q&A: Availability of Replacement Clamps for Thule Ascent 1100 Thule Cargo Box
- Q&A: Replacement Cradle Needed for Thule Atlantis 2100 XT
- Q&A: What Comes With the Replacement Quick Grip Mount Assembly
- Q&A: Could Hollywood Racks RV Rider part # HLY64FR Carry Rad E-Bikes
- Q&A: How to Determine if Replacement Quick Grip Mount Fits Rooftop Box
- Article: Hitch Mounted Cargo Carrier Information
- Article: How to Strap a Kayak to a Roof Rack in 4 Steps (With Pictures)
- Article: Rooftop Cargo Carriers
- Article: Performance Chips and Modules
- Article: Ball Mount Basics: Weight Capacity, Class, and Size
- Article: Towing a Trailer? Let's Talk About Brake Controllers
- Article: Stability Control for Heavy Duty Vehicles