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Deal.ai › Compare

Judd Folding Bike vs Dahon Mariner D8 II Folding Bike

Buy the Dahon Mariner D8 II if you ride hills, longer commutes or coastal and humid places; its 8-speed Shimano gearing, Tektro brakes and corrosion-coated parts do far more than the Judd's single gear and coaster brake. Buy the Judd if you want the simplest, lightest-feeling folder for flat city rides and apartment storage, and you accept standing up on climbs. Both use aluminum frames and 20-inch wheels and fold small; the Judd is the more stripped-down, low-maintenance machine, while the Dahon is the more versatile one. Owners of the Judd praise its quick fold and simple drivetrain but wish for fenders and more gear range on hills.

  • Choose the Judd if you ride mostly flat pavement, want no cables or shifters to maintain, and need the simplest possible fold for a train or a walk-up.
  • Choose the Dahon Mariner D8 II if your routes include hills, you want hand brakes and eight gears, or you ride in humid or salty air.

Prices

  • Judd Folding Bike: $299.99 at Retrospec (last seen Nov 11)
  • Dahon Mariner D8 II Folding Bike: $949.00 at CasaBikes Boston (last seen Nov 13)
  • Difference: the Judd Folding Bike is $649.01 cheaper than the Dahon Mariner D8 II Folding Bike at the latest prices (Nov 11 and Nov 13)
Judd
Judd Folding Bike - Single Speed

Judd Folding Bike

Judd Folding Bike - Single Speed

4.8(130 ratings)
$299.99at RetrospecChecked Nov 11
See all prices and details
Visit Retrospec
Pros
  • Very simple drivetrain with nothing to adjust
  • Quick, easy fold that fits an apartment or a train
  • Light aluminum frame
  • Owners rate it highly for looks and value
Cons
  • Single gear is hard work on hills
  • Coaster brake only, no hand brakes
  • No fenders included
  • Fixed fit with little adjustment
Dahon
Dahon Mariner D8 II Folding Bike

Dahon Mariner D8 II Folding Bike

$949.00at CasaBikes BostonChecked Nov 13
See all prices and details
Visit CasaBikes Boston
Pros
  • Eight gears cover hills and longer rides
  • Tektro hand brakes for controlled stopping
  • Coated parts resist humid and salty air
  • Adjustable saddle and long seatpost fit many riders
Cons
  • Heavier at 27.9 pounds
  • More parts to maintain than a single speed
  • Folded shape is bulkier in one dimension
  • Newer model with a shorter track record

What separates them

Judd Folding BikeDahon Mariner D8 II Folding Bike
DrivetrainSingle speed, no shifter or derailleurShimano 8-speed, 52T chainring with 11-32T cassette
BrakesRear coaster brake onlyTektro hand brakes front and rear
Hills and terrainFlat pavement; climbs need leg strengthHandles slopes and varied paved routes
WeightLight aluminum frame built to carry and store easily27.9 pounds
Folded sizeAbout 32 x 30 x 10 inches32.7 x 13.8 x 26.4 inches
Corrosion resistanceStandard componentsCoated components for humid and salt air
Rider fitFixed setup, adult ridersAdjustable saddle and extended seatpost for a broad height range
MaintenanceMinimal: one gear, no cablesMore parts to service, but standard Shimano components

Price history

  • Dahon Mariner D8 II Folding Bike: lowest $949.00 on Nov 11 at West Marine; $949.00 on Nov 13.

Prices at every store

Judd Folding Bike

  • RetrospecNew

    In stockReturn policy

    $299.99Checked Nov 11
    Visit Retrospec
Prices and history →

Dahon Mariner D8 II Folding Bike

  • West MarineNew

    In stock

    $949.00Checked Nov 13
    Visit West Marine
  • usa.dahon.comNew

    In stock

    $949.00+ $17.99 shippingChecked Nov 13
    Visit usa.dahon.com
  • CasaBikes BostonNew

    Availability unknown

    $949.00Free shippingChecked Nov 13
    Visit CasaBikes Boston
  • Upzy.comNew

    Out of stock

    $949.00Free shippingChecked Nov 13
    Visit Upzy.com

Store links may earn us a commission. Some prices via Klarna.

All 5 stores and price history →

Specs compared

SpecJudd Folding BikeDahon Mariner D8 II Folding Bike
Number of speeds1—
Wheel size20 inch—
Frame materialaluminum—
Folded dimensions10"x30"x22"—
Bike typeCommuting Bike—
Age rangeAdult—
Brake typecoaster brake—
Tire modelKendal Kwest—
Release Year—2026
Speeds—8
Color—Silver

What reviewers say

Judd Folding Bike

  • 4.8 / 5130 ratings

Buyers rate it highly for its simple single-speed design, quick folding and easy apartment storage. They call it lightweight, low maintenance and good value, though some want fenders and note hills take effort.

What people mention
  • FoldingPraisedBuyers say it folds and unfolds quickly and packs small enough for an apartment or a train.
  • WeightPraisedThe aluminum frame is described as light and easy to carry.
  • SimplicityPraisedOwners like the single gear and coaster brake with no shifter or brake cables to maintain.
  • HillsCriticisedRiders say the single speed takes real leg strength on climbs.

Dahon Mariner D8 II Folding Bike

Owner feedback on Dahon's Mariner line is generally positive on build quality and the folding hinge, with the aluminum frame and corrosion protection singled out for coastal use. Complaints tend to center on weight and folded bulk rather than reliability.

What people mention
  • Build qualityPraisedOwners describe the frame and hinge as sturdy and rattle-free over time.
  • Corrosion resistancePraisedRiders in coastal and humid areas report the coated components hold up well.
  • WeightCriticisedCarrying it up stairs or onto transit is tiring for some owners.
  • Folded sizeMixedCompact enough for trunks and closets, but larger than 16-inch folders.

Questions and answers

Which is better for hilly commuting?
The Dahon. Its 8-speed Shimano drivetrain and 11-32T cassette give the range to climb, while the Judd's single gear demands leg strength on slopes.
Which folds smaller?
They are close. The Judd folds to roughly 32 x 30 x 10 inches and the Dahon to 32.7 x 13.8 x 26.4 inches, so each is compact in a different dimension. Check your storage space against both shapes.
Which needs less maintenance?
The Judd. One gear and a coaster brake mean no derailleur, shifters or brake cables to adjust. The Dahon's gears and hand brakes are standard parts but need periodic tuning.
Is the Dahon worth stepping up to?
Yes if you ride hills, want hand brakes, or live in humid or coastal areas. If your rides are flat and short, the Judd's simplicity is enough.
Which is easier to carry onto a train or up stairs?
The Judd is the lighter, simpler lift, and owners praise its quick fold. The Dahon is manageable at 27.9 pounds but heavier.
Do both use 20-inch wheels?
Yes. Both run 20-inch wheels, so ride stability is similar; the Dahon uses CST 20 x 1.5 tires and the Judd uses Kenda Kwest tires.

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