Giant Cyclotron Mag II trainer review

Simple magnetic unit

BikeRadar score4/5

Giant have expanded their 2012 turbo range to include fluid trainers, but this simple magnetic unit is still a decent value option for riders who want a less strenuous workout.

There are a couple of bolts to insert but the double-sided axle clamp has a quick-closure lever – it grips securely and the whole unit is reassuringly stable. The soft urethane roller feels lumpy and rumbles at lower speeds, and there’s some slipping when you start sprinting. The noise levels and feel aren’t too bad once you’re spinning fast though. 

That’s what you’re likely to be doing for a lot of the time too – there’s little difference between each of the seven steps of resistance from the remote on the bars. The top level is easy to rev out if you’re on a compact chainset, and even with full-sized rings it doesn’t fight much out of the saddle.

Guy Kesteven

Freelance Writer, UK
Guy started filling his brain with cycle stats and steaming up bike shop windows back in 1980. He worked the other side of those windows from '89 while getting a degree in “describing broken things covered in mud" (archaeology). Dug historical holes in the ground through the early '90s, then became a pro bike tester in '97. Guy has ridden thousands of bikes and even more components the world over since then and can remember them all in vivid, haunting detail. Can't remember where the car keys are, though.
  • Age: 45
  • Height: 180cm / 5' 11"
  • Weight: 68kg / 150lb
  • Waist: 76cm / 30in
  • Chest: 91cm / 36in
  • Discipline: Strict sadomasochist
  • Preferred Terrain: Technical off-piste singletrack and twisted back roads. Up, down, along — so long as it's faster than the last time he did it he's happy.
  • Current Bikes: An ever changing herd of test machines from Tri bikes to fat bikes and everything in between.
  • Dream Bike: His Nicolai Helius AM custom tandem
  • Beer of Choice: Theakston's Old Peculier (not Peculiar)
  • Location: Yorkshire, UK

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