Add-On Bike Rack Extension for 4187 E-Bike Rack, 100 LBS Capacity for 2 Bikes, Fits 5" Fat Tire, Steel-Aluminum Build — NOT a Standalone Rack, Frame Extension Only
EXPANDS YOUR 4187 RACK BY 2 BIKES: Designed exclusively as an add-on for the 10104187 main rack, this extension lets you carry up to 2 additional bikes. Total add-on capacity is 100 lbs. Perfect for family trips, group rides, and longer outings when one rack isn't enough.
100 LBS CAPACITY BIKES ONLY: Carries 2 standard bicycles within a 100 lb total limit. Not rated for e-bikes, heavy-duty bikes, motorcycles, or cargo bikes — for those, use the main 4187 platform.
3" FAT TIRE COMPATIBLE: Wheel cradles accommodate tires up to 3" wide, matching the fit profile of the base module so your full setup stays consistent.
UPGRADED ANTI-WOBBLE & ANTI-SCRATCH: Reinforced bolt connections and shock-absorbing threads eliminate sway between the main rack and the extension. Soft padding, rubber covers, and premium tie-down straps keep every bike scratch-free.
PREMIUM STEEL-ALUMINUM BUILD: High-strength aluminum and steel frame with professional anti-rust coating. Tested against salt, rain, snow, and extreme weather — built to match the durability of your base module.
HASSLE-FREE SETUP: Ships with complete mounting hardware and step-by-step instructions. Snaps onto your existing base module in minutes.
DEPENDABLE SUPPORT: Backed by 1-year warranty, spare parts coverage, and responsive aftersales team. Need the base module first? Find it under our E-Bike Racks collection.
The steel and welds on the Add-On Bike Rack Extension for 4187 E-Bike Rack are seriously beefy and the powder coat is thick. After a rainy month there's no rust anywhere. Built way above its price point. Perfect for our trips to the trailhead.
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Anthony Park
Works on both my vehicles
Swapped the Add-On Bike Rack Extension for 4187 E-Bike Rack between my SUV's 2" hitch and my wife's 1-1/4" with the adapter — fits both. Rear camera still works tilted. Versatile and secure. Mounted to our Airstream for the season.
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Robert Lombardi
Very good, faint rattle on rough roads
Carries two fat-tire e-bikes nicely and feels secure. There's a slight rattle on washboard gravel even with the bolt snug — nothing alarming, and on pavement it's silent. Still a great buy. On a Honda CR-V with a 2" hitch.
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Maria Walsh
Rock solid at highway speed
Loaded two fat-tire e-bikes onto the Add-On Bike Rack Extension for 4187 E-Bike Rack and there is zero sway even at 70 mph. The anti-rattle bolt takes all the play out of the hitch — I just enjoy the drive now. We took it from Denver to Moab and back.
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Patrick Price
Sticks out a bit but very stable
On my compact SUV the loaded Add-On Bike Rack Extension for 4187 E-Bike Rack extends further back than expected, so I'm mindful in lots. Stability is excellent and loading is easy. Happy overall. Survived a Utah dust storm without rusting.
