IMPORTANT: This item requires specialized shipping. Additional fees may apply during the checkout process.
Original & Woopy: In Stock (5-7 days to ship) | Woopy XL: Out of Stock Est (late May) - Comes with locking DropTop Fork Mount
For 12, 15 and 20mm thru axles. Dummy Axle sold separately for QR bikes
Key Features - DropTop Fork Mount
- The only locking thru-axle track mount for truck and van tracks
- Compatible with 12mm, 15mm, & 20mm thru axles up to 110mm wide (for 20mm use shims must be removed)
- Vertical and horizontal mounting positions
- TPU overmolded shim eliminates the need to switch out shims for 12mm or 15mm axles
- Anti-Theft: TPU surface provides sufficient friction to stop the axle from being removed when DropTop is firmly clamped and locked
- Wide mouth opening to easily load your bike and a locking T-Bolt that adjusts for a tighter hold so the thru-axle cannot be removed when locked
- Carries 1 bike, up to 45 lbs
- Lock core, keys, and Track Hardware Included
- Fits QR bikes with Axle Dummy Adaptor sold separately
- BillieBars Stainless Mounting Hardware Included -Discard RockyMount supplied hardware
- Now includes a Security Bit Tool from BillieBars!
- Patent # 12221073
Key Features - Original Tire Tray
- Made and Manufactured in the USA
- Securely straps the rear tire down
- 14" overall length
- Can be cantilevered off the cross bars to your length bike!
- Made from Aluminum - powder coated black
- All Stainless-Steel Hardware
Key Features - Woopy Tire Tray
- Made and Manufactured in the USA
- Flush profile against the top of the BillieBars system - allows an even lower profile for tent mounting, and perfect compatibility when the tent is open!
8" from the back face of the bar
- Can be mounted on the back of the cross bar for longer mountain bikes, or on the front of the cross bar for shorter kids bikes. You can even mount two of them back to back for what ever length bike you are hauling that day!
- Made from Aluminum - powder coated black
- All Stainless-Steel Hardware
- Patent Pending
Key Features - Woopy XL Tire Tray
- Made and Manufactured in the USA
- Flush profile against the top of the BillieBars system - allows an even lower profile for tent mounting, and perfect compatibility when the tent is open!
12.5" from the back face of the bar - Perfect for Down Hill Mountain Bikes!
- Can be mounted on the back of the cross bar for longer mountain bikes, or on the front of the cross bar for shorter kids bikes. You can even mount two of them back to back for what ever length bike you are hauling that day!
- Made from Aluminum - powder coated black
- All Stainless-Steel Hardware
- Patent Pending
Quick Release (QR) Axles See here:
- Fits QR bikes with Axle Dummy Adaptor sold separately
https://rooftopoverland.com/products/billiebars-rockymounts-9mm-qr-with-dummy-axle-for-driveshaft-and-droptop
Product Details
Description
IMPORTANT: This item requires specialized shipping. Additional fees may apply during the checkout process.
Original & Woopy: In Stock (5-7 days to ship) | Woopy XL: Out of Stock Est (late May) - Comes with locking DropTop Fork Mount
For 12, 15 and 20mm thru axles. Dummy Axle sold separately for QR bikes
Specifications
Features
Key Features - DropTop Fork Mount
- The only locking thru-axle track mount for truck and van tracks
- Compatible with 12mm, 15mm, & 20mm thru axles up to 110mm wide (for 20mm use shims must be removed)
- Vertical and horizontal mounting positions
- TPU overmolded shim eliminates the need to switch out shims for 12mm or 15mm axles
- Anti-Theft: TPU surface provides sufficient friction to stop the axle from being removed when DropTop is firmly clamped and locked
- Wide mouth opening to easily load your bike and a locking T-Bolt that adjusts for a tighter hold so the thru-axle cannot be removed when locked
- Carries 1 bike, up to 45 lbs
- Lock core, keys, and Track Hardware Included
- Fits QR bikes with Axle Dummy Adaptor sold separately
- BillieBars Stainless Mounting Hardware Included -Discard RockyMount supplied hardware
- Now includes a Security Bit Tool from BillieBars!
- Patent # 12221073
Key Features - Original Tire Tray
- Made and Manufactured in the USA
- Securely straps the rear tire down
- 14" overall length
- Can be cantilevered off the cross bars to your length bike!
- Made from Aluminum - powder coated black
- All Stainless-Steel Hardware
Key Features - Woopy Tire Tray
- Made and Manufactured in the USA
- Flush profile against the top of the BillieBars system - allows an even lower profile for tent mounting, and perfect compatibility when the tent is open!
8" from the back face of the bar
- Can be mounted on the back of the cross bar for longer mountain bikes, or on the front of the cross bar for shorter kids bikes. You can even mount two of them back to back for what ever length bike you are hauling that day!
- Made from Aluminum - powder coated black
- All Stainless-Steel Hardware
- Patent Pending
Key Features - Woopy XL Tire Tray
- Made and Manufactured in the USA
- Flush profile against the top of the BillieBars system - allows an even lower profile for tent mounting, and perfect compatibility when the tent is open!
12.5" from the back face of the bar - Perfect for Down Hill Mountain Bikes!
- Can be mounted on the back of the cross bar for longer mountain bikes, or on the front of the cross bar for shorter kids bikes. You can even mount two of them back to back for what ever length bike you are hauling that day!
- Made from Aluminum - powder coated black
- All Stainless-Steel Hardware
- Patent Pending
Quick Release (QR) Axles See here:
- Fits QR bikes with Axle Dummy Adaptor sold separately
https://rooftopoverland.com/products/billiebars-rockymounts-9mm-qr-with-dummy-axle-for-driveshaft-and-droptop
Spent a month looking for crossbars and stumbled upon this ruggedized kit. Purchased in January 2026. Shipping was free and they arrived within a few days. Installation was easy. My rails are silver so not sure yet but I may paint the rails black. I watched a few YouTube videos and one of the guys did that to match with the crossbars. I’ll wait for the nice weather before deciding. Nice looking regardless. Heavy duty. Happy with this product! PS I notice many want to install strip padding underneath the wind fairing. There is plenty of room / clearance so that was not needed in my case.
I initially liked the Alpha II RTT. However after a few uses it experienced a cracked roof. I contacted the company twice with no response. Think hard about buying a product from this company. These products are made in China, which can only compete on price. Very dissappointed in product, its cost, and the company.
