This is for two reasons.
Lightweight rear pannier rack.
Road bike frames rarely have rack mounting points and road bikes often have short rear ends that cause heel clearance issues with panniers.
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A high front rack is good if you want to carry light items on top of the rack as well.
Also timbuk2 appears to.
Thule pack n pedal tour standard frame.
Topeak explorer the best rear bike rack.
No rear rack mounts.
It s a good place for a sleeping mat for example.
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That put them up high at the same level as rear racks or down low by the wheel hub.
Tubus rack with qr mounting kit standard frame.
For example blackburn s outpost fat bike rack has a high 70lb weight limit the ability to adjust its width and height offers lower pannier mounting points and has rear light mounts.
Dual suspension or carbon frame.
Also timbuk2 appears to have discontinued this model.
Blackburn expedition 1 disc compatible rear pannier rack 49 99 the alloy rack is designed from aircraft grade aluminium and this rack has been designed for 700c or 29er wheels but should.
The timbuk2 lightweight urban pannier didn t fit our 15 inch laptop it only accommodates up to a 13 inch laptop.
Flexzion bike rear rack mount bicycle back seat pannier luggage backpack cargo basket carrier with taillight mount lightweight aluminum for road mtb mountain folding bike 110 lbs capacity last update on 2020 04 13 affiliate links images from amazon product advertising api.
Swagtron hands free rear cargo rack light duty carrier for eb 5 pro e bike black.
Typically front panniers for high position racks are smaller than bicycle panniers rear.
Tubus cosmo for heavy weight touring tubus logo titan for mid weight touring tubus airy for light weight touring.
But a company in the uk have decided that lightweight road bikes should be more multipurpose so they designed a rear rack and pannier system from scratch which is both lightweight.