Product Details

Tern – Eclipse S18

This ain’t your mama’s folding bike. With integrated lighting powered by a super-efficient dynamo hub, front and rear racks, a floor pump in the seatpost, and big beefy 507 mm tires that munch potholes for lunch, the Eclipse S18 is the ultimate hard-core commuter that will get you through the Zombie Apocalypse. Great for traversing the urban jungle or trekking it alone in the wild countryside.

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  • Description



  • Front Spartan™ Rack and rear Cargo Rack™ for hauling a load
  • Andros™ adjustable handlebar stem so you can find the most comfortable riding position during long days in the saddle
  • A hidden tire pump in the BioLogic PostPump™ seatpost for on-the-road repairs
  • Bright, wide-beam Valo™ 2 front light powered by the BioLogic Joule™ 3 electricity-generating hub
  • Extreme gear range (26 – 111 gear inches) for loaded hill climbing
  • Folds in under 10 seconds to go on trains, planes, buses and boats


Bicycle Times

Bicycle Times


First thing I noticed was how stiff the bike was, and how quiet. My last folder had a bit of a creak to ‘er, but Tern has improved on this by increasing the surface area where the two halves of the bike join together, and this is good. Plus the rear end is in what Tern calls Doubletruss, for more stiffness.

Fit was fine, with the gargantuan seatpost providing ample extension, and Tern’s Biologic Andros stem allowing for reach and height adjustment.

I also noticed the extremely luxurious ride afforded by the bigger wheels, and the high volume Schwalbe tires. Forward movement was predictable, with Sram’s 2×9 drivetrain moving the bike forward just like it should.

I did not ride down any big hills yet, but I was stoked to be braking with Avid BB7 disc brakes. One of my favorites thanks to plenty of power and low-low maintenance.

Fit wise, the position is upright. Great for looking around, keeping you back straight and comfy. The S18 fits riders from 4’10” to 6’5”, and at 6’4” I do not doubt this to be true.

Maximum bike, minimum space.


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Accessories available

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