SDG I-Fly I Beam saddle and Micro carbon seatpost review£160.00

Good saddle and seat combination

BikeRadar score5/5

We’ve been running an I Beam saddle and post on at least one of our long termers ever since they first appeared. Providing seating duties on acarbon hardtail we’re using more aggressively every ride, this one is probably the best showcase we’ve ever had for the uniquely-railed I Beam system.

At under 150g for the I-Fly saddle and well under 200g for the post (now we’ve cut its carbon shaft down to remove any excess length), it’s an incredibly light setup. It’s also far cheaper than the conventional titanium or carbon-railed saddle and carbon post combo we’d have to use to compete otherwise.

Masses of fore and aft adjustment from the single bolt and centre-rail clamp means huge potential to play around with effective seat angle and top tube length on our Whyte 29C – a bike we’re constantly swapping stems and forks on. 

This is even more of a contrast with the super-light competition, which often use inline saddle clamps and saddle rails with a very restricted clamping area.

Unlike most hyper-light seating systems you don’t have to ride I Beams like you’re on a road bike. Over the past decade we’ve cartwheeled the poor things end over end through rocks, crushed our bits on them off drops, crunched them through compressions and never had one move, sheer off or otherwise skipped beat. 

The downside is that the I-Fly isn’t forgiving on pampered arses and will rattle your tackle over rough terrain. But chances are if you’re after a lightweight saddle setup you’ll have a biffin’s bridge (Google it) like leather anyway, in which case you’ll be absolutely fine cracking out epic after epic on it with just the occasional spritz of surgical spirit on your spuds [Yikes - Ed]. 

This article was originally published in What Mountain Bike magazine, available on Apple Newsstand and Zinio.

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

Related Articles

Back to top