SDG I-Beam Micro Seat Post and Formula FX Saddle

When it comes to seats and seat posts, SDG is one company who has definitely came up with a unique and beneficial way to thwart issues related to a typical seat and seat post interface. The new SDG Micro I-Beam seat post (SP-951) features a lot of benefits over the first I-Beam seat post. Likewise, the SDG Formula FX saddles also take the I-Beam seats to the next level as well by offering a flex cavity unseen in previous I-Beam saddles.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

I-Beam micro adjust seat post (click to enlarge)

The new I-Beam micro seat post comes in three sizes and is available only in black. Each post comes in a pretty long 400mm length, but its easily cut down to fit. The post has clean height adjustment markings on it to let you know its height quickly and cleanly.

  • 27.2 x 400
  • 30.9 x 400
  • 31.6 x 400
, SDG I-Beam Micro Seat Post and Formula FX Saddle

micro adjust seat post assembly detail (click to enlarge)

The I-Beam micro seat post natively will only work with I-Beam saddles but you can also buy a rail adapter to make the post work with conventional saddles. There is only one bolt on the micro seat post so securing the I-Beam saddle is quick and easy to install onto the post. There is no spring in the micro seat post so to remove the seat, you have to loosen the bolt then wiggle the seat to unseat the wedged clamps.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

micro adjust seat post detail (click to enlarge)

The I-Beam system allow for tons of options for setup that just didn’t exist before. Tons of angular adjustability as well as the most fore-aft adjustability of any seat / seat post combination. This feature is one that every biker can appreciate. Running the seat in the extreme fore/aft positions probably isn’t the best of ideas but it does open the door for those who need the extremities the I-Beam system provides.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

Formula FX saddle mounted (click to enlarge)

Freerider’s and downhiller’s love the I-Beam system as they can get the seat where they need it to be. These bikes often have slack angles and conventional seat post systems often can not compete with the adjustability of the I-Beam system. Additionally, there are no rails to bend on the I-Beam system.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

Formula FX saddle detail (click to enlarge)

The I-Beam seat is unique in that it features a beam down the base of the seat that is a fiber composite material. The Formula FX series I-Beam saddles have a flex cavity built into the base of the seat to give more flexibility to the seat. The suspended I-Beam system of the FX saddles compared to the solid beam in the Belair and the I-Fly series saddles offer a more railed saddle feel.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

Formula FX saddle underside detail (click to enlarge)

The FX series saddles allow the seat to flex a good bit more similarly to a railed saddle. If you’ve looking for a I-Beam setup that feels more like a railed saddle feel the FX delivers an amazingly nice ride.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

SDG Formula FX saddle (click to enlarge)

, SDG I-Beam Micro Seat Post and Formula FX Saddle

side profile (click to enlarge)

The FX saddle comes in three different colors:

, SDG I-Beam Micro Seat Post and Formula FX Saddle

(click to enlarge)

  • Black w/ Gray Embossed Pin Stripe (pictured)
  • Black w/ Red Embossed Pin Stripe
  • White w/ Gray Embossed Pin Stripe
, SDG I-Beam Micro Seat Post and Formula FX Saddle

SDG Bel-Air SL (click to enlarge)

In addition to the FX saddle, the ever popular I-Fly and Bel-Air SL/ST are also still available. The Bel-Air is a very popular saddle as is the I-Fly. The Bel-Air packs a good amount of padding and is quite comfortable.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

Bel-Air and I-Fly I-Beam saddles still use the solid beam system (click to enlarge)

The I-Fly isn’t the most padded saddle on the market but offers a nice lightweight saddle that can take some good hits and still ask for more.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

SDG I-Fly (click to enlarge)

The IFly comes in three different colors:

  • Black Top/Blk Perf
  • White Top/ Gray Mesh
  • White Top/Blk Perf
, SDG I-Beam Micro Seat Post and Formula FX Saddle

rideSFO custom SDG I-Fly (click to enlarge)

SDG also offers companies the ability to customize SDG saddles and you can purchase specialty marked saddles through companies like RideSFO, Mongoose, GT, and Commencal to name a few.

, SDG I-Beam Micro Seat Post and Formula FX Saddle

Formula FX with a nice dirt patina after testing (click to enlarge)

In our testing of these saddles they proved to be set and forget which was quite nice. They were silent in operation and there wasn’t any annoying creaking. Setup was quite easy to initially adjust to any angle. Tightening the micro post was easy with only one bolt operation. A good torque is required to get the post and seat play-free. To re-adjust the seat however requires unwedging the I-Beam clamp and as such micro adjustments aren’t quite as easy as some railed systems. There aren’t any angle markings either so re-adjusting / tweaking slightly can be a bit harder than it could be.

Weights:

Part Year Real(g) Pic.
SDG I-Beam 30.9 x 400mm seat post 2008 249 , SDG I-Beam Micro Seat Post and Formula FX Saddle
SDG I-Beam 31.6 x 400mm seat post 2008 252 , SDG I-Beam Micro Seat Post and Formula FX Saddle
SDG I-Beam Formula FX I-beam Seat 2008 219 , SDG I-Beam Micro Seat Post and Formula FX Saddle
SDG I-Beam IFly I-beam Seat 2008 169 , SDG I-Beam Micro Seat Post and Formula FX Saddle
SDG I-Beam Belair SL I-beam Seat 2008 223 , SDG I-Beam Micro Seat Post and Formula FX Saddle
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MSRP:

  • I-Beam Micro seat post – $119.99
  • FX saddle – $119.95
  • Bel-Air SL I-Beam saddle – $89.99
  • I-Fly saddle – $89.95

Conclusion:

The I-Beam offers a lot of benefits to all bikers. Sometimes bikes require a unique setup and the I-Beam ensures maximum adjustability with their system. Additionally, there is no rail to bend in the I-Beam system which is often important in a DH/FR/AM bike. The Formula FX saddles offer a very compliant ride that mimics the flex cavity of a railed saddle immensely well.

There are some small nuances with setting up the saddle once the wedge is set but overall it’s a very nice system that we have no problem recommending to anyone. If you’re looking to purchase any of these SDG products online check out rideSFO as they’ve got the full selection of SDG products available for well below MSRP.

[SDG I-Beam Saddles and Posts Gallery] [SDG Website]