The Original I-Beam System hasThe widest range of adjustment onThe market.The I-Beam System uses a single, easy-access 6mm bolt for quick and simple adjustments or saddle changes. CATEGORY: mtb / roadFEATURES:The Original I-Beam System hasThe widest range of adjustment onThe market.The I-Beam System uses a single, easy-access 6mm bolt for quick and simple adjustments or saddle changes. 6061 cold forged aluminum head and clamps with 2014 aluminumTube.WEIGHT: 229g (27.2mm x 350mm)
Strengths: Lightweight, Extremely strong, Very comfortable.
Weaknesses: None that I have experienced.
I bought this seat after bending several rail system seats. It didn't matter who they were made by or how strong they were supposed to be, I bent them. I am 6'9" and almost 300lb, and ride intermediate downhill/freeride. This is the ONLY seat that has held up for me. I bought it over 3 years ago and it has held up like a champ. It was a little sticky at first, but once broke in I really like the feel of the seat. I highly recommend this seat to anyone that bends seat rails.
Bike Setup: Haro X7, Marzocchi 888, Fox DHX5.0 Shock, SDG I-Sky
a Cross Country Rider
from Cape Town, South Africa
Date Reviewed: January 18, 2010
Strengths: Light weight, looks and ease of use. No issues with seat coming loose, ever. Use it properly and it works perfectly. I have the SDG Bel Air SL seat whih is extremely comfortable and durable. Still 100% after 4,5 years.
Weaknesses: None at all.
This is teh best seat and post combo I have ever used. Its very light, not bthat expensive and looks great. the seat is extremely comfortable on long rides too. If I break it or wear it out, teh same post and seat are going back on...
Weaknesses: does not work, the seat keeps tilting back, even after tightening the bolt as hard as possible. after 5 times on re- tightening the bolt has now worn out and cant be tightened fully. hence the issue is now much worse
if you like looking at your bike but dont ride it then buy the Ibean.
Strengths: Light, easy to adjust
Better than kore I have broke 2 of their posts to date!
Weaknesses: Limited choice, harsh ride.
This is definiatly a love it or hate it product, it is light & cheap, & with loads of adjustment (dont understand these people saying it has limited adjustment)
Also I cant see how people are having slipping trouble as a medium torque leaves this super sturdy!
I have an sdg saddle, but started off using kore posts, my carbon one snapped within 6months & an ally one followed shortly after! The sdg post seems much more rigid.
No-one seems to have mentioned the harshness of the ride with these set ups, on my hard tail I really start to suffer on long day rides as there are no rails to add a bit of give.
I would suggest that on a full suss this product would b near to perfect!
Similar Products Used: Various carbon & top end standard systems
Bike Setup: Hummer xc, Nixon platinum, full xo
a Cross Country Rider
from London, UK
Date Reviewed: April 23, 2009
Strengths: Immoveable, single bolt design. Study and light.
Weaknesses: No layback available as yet.
I've used this almost since it came out and never had a problem with it. It sits there, doesn't move and feels good with like minded saddles. Having got a new bike which requires a degree of layback, I may have to switch unless SDG come up with something.
Similar Products Used: Lots of different 'rails' saddles.
Bike Setup: Boardman Team hardtail
a Cross Country Rider
from Norwich, Norfolk, UK
Date Reviewed: January 3, 2009
Weaknesses: Weak bolt. Proprietary rail system.
The I-Beam seatpost was part of a a complete Dahon Flo that I purchased. While setting up the bike I wanted to shift the saddle forward. The seatbolt was a loose fitting 5mm (I tried 5.5mm but that was too big) and the bolt burred and became useless in the process of trying to loosen it. So I stuck with the seat in its original position - thinking that the bolt must be tight. But I was wrong, the saddle slipped further back wrecking the little grooves on the rails. So both saddles and seatpost wrecked. I'm not a heavy rider so I wouldn't recommend this product to anyone.
Similar Products Used: Thomson Elite, Ritchey something, various unbranded
Bike Setup: Wheels, handlebars, the usual.
a Cross Country Rider
Date Reviewed: November 19, 2008
Strengths: Light would be the only thing that springs to mind.
Weaknesses: Limited Saddle selection. Because of the I-beam. No place on the saddle to put a saddlebag. This is a personal thing as I do a lot of weekday rides of around 60 minutes and don't always want to carry a backpack with me.
I find it easier to "fine tune" saddle levels with two bolts as opposed to one on the side.
When I first saw the i-beam couldn't work out what the fuss was about. It does work, just limits your choice of perch.
I was convinced to give it a try when I bought my new bike mainly because of the weight advantage. Setup was nothing spectacular no quicker than the specialized with a conventional saddle.
Because you don't have much saddle choice the system limits you. It was also supplied with a shim as the post is too small for my seat tube. Net result, it constantly slides down. Fault of the LBS I know, but just adds to the irritation.
And that coupled with the saddle rubbing me raw leaves me massively irritated !! Something that has never happened to me before on any other saddle that I have used.
Because it is all proprietary components I will now have to replace everything. You either like that or don't; I don't.
a Weekend Warrior
from Silver Spring, MD
Date Reviewed: March 4, 2008
Strengths: Solid and easy to adjust. Doesn't move and the SDG seat it's a comfortable ride. No more seat rails to bend
Weaknesses: Post started to bend after 3 months (27.2) but then again I am a 270lb fat dude. I have yet to find one that can hold my weight. I am sure if my frame could take a 30 mm or higher I would be fine.
After reading a few reviews of other people having problems with the seat sliding off, I would defiantly have to disagree. I am 270lbs and I have been way back on the seat and it has budges. I can honestly say I thought I would have broken this post by now but after 3 months of use I am just starting to see a little bit of bend where it goes into the frame (I would have this on any other post due to my size). I have not had to re-tighten or adjust the seat at all since I started using it over 3 months ago. Since there are no seat rails to bend, I can reuse the seat and replace just the post if I bend it. I have bent many seat rails and past as you can imagine with someone my size. So far this is the strongest I have used and I will keep on using!
Bike Setup: Frame T6061 aluminum Fork FOX 32 TALAS RLC, 140+120+100mm Rear shock Manitou Swinger 3-Swinger Air Crankset FSA Afterburner MegaExo 44/32/22 Shifters SRAM X-7 Trigger Brakes Avid Juicy 7 Brake levers Avid Juicy 7 Front derailleur Shimano LX E-type Rear derailleur SRAM X-9 Head set FSA Orbit Z Bottom bracket FSA Afterburner MegaExo Rear cog SRAM PG991 11-34 Front hub Chris King ISO Rear hub Chris King ISO Rims Mavic 823 Disc UST Tires Maxxis Ignitor UST, 26x2.35 Stem Cannondale XC3 Handlebar FSA XC281A OS Seat post SDG I-Beam Saddle SDG BelAir SL Pedals Shimano PD-M520 Chain SRAM PG991
from sydney nth beaches n.s.w. australia
Date Reviewed: December 10, 2007
Strengths: simple strong good design
Weaknesses: I had the carbon post and have switched back to the alloy due to the amount of movement in the seat tube. No matter how much I cleaned or tightened it the post would wiggle from side to side and end up dropping. Every time i landed on the seat it would slip down really frustrating
stick with the alloy post carbon is a waste of money
from portland, oregon USA
Date Reviewed: December 2, 2007
Strengths: Cool looking, great theory.
Weaknesses: Everything. I built up this bike and was extremely excited about getting it out for the first time yesterday. I mean I poured my heart into this bike. Within the first 10 minutes I made one slight bounce on it and the whole top cantered back and the seat slid out and shot off the rear wheel. That being a milisecond before my manhood was shot off the rear wheel after a nice scraping by the post itself.
THAT HAPPENED THREE MORE TIMES IN TWO HOURS! And yes, after the first time I really inspected to make sure every tooth was set and tightened the FU*K out of it.
Like I said, this is a great looking, clean set up. IT JUST DOES NOT WORK AT ALL.
Bottom line. Junk. Pretty to look at, worthless in reality.
Similar Products Used: Thomson elite (switching back to, along with another seat now)
Bike Setup: Mongoose EC-X 4x, Pike 454 Dual Air,Transition Revolution wheels,Azonic Nitro Cranks/Bash, Juicy 7's,Nevegal 2.35's,Funn 10 year orange bars, SIC LLc stem etc....
a Weekend Warrior
from Medford Oregon
Date Reviewed: October 14, 2007
Strengths: Simple design, super light.
Weaknesses: Can't slam seatpost as low as other designs on longer seat tube frames.
Previous 2 reviews should be erased. This is the most adjustable, trouble free, lightweight seat/post design out there. Almost indestructable. Those guys didn't read the instructions or something. If you want to save weight on your big bike, this is the way. The I-fly, FRD, and I-sky seats are all great. I have used them all. Get It.
Date Reviewed: October 7, 2007
Strengths: Light, Adjustable
Weaknesses: If you sit on the seat then it will roll backwards around the pivot and drop you onto the rear wheel. I must tighten it several times per ride, and the next time I sit on it, it collapses again. It is really, really annoying. Stick with rails.
The post and the SDG seat are very light, but you cannot sit on them because the seat will rotate back on the post because of the stupid Ibeam interface. It is a flawed design. I want my rails back. Its cheap and light though, so If youre a freerider who never sits on his seat, go for it! However, if you sit on your seat, look at a non-Ibeam seat. (however this is all based upon the assumption that I didn't get a dud, maybe others are better. However, I'm not going to risk it to find out. Thompson, here I come.)
My current seat is broken and was thinking of replacing with a I beam. Thinking of putting the Bel Air on. I read that some people have had issues with it snapping. I'm not sure if this was a early issue or if they are still having problems. Looking to see if anybody has some real life experience. ... Read More »
I just wanted to post that I love my SDG I-beam. I am 6'9" and 300lb and wear out bikes in a big way.
I bought a specialized HR comp a few years back and tore the cranks off in one day, just with the torque. I now ride a Haro X7 and it can take a beating much better than the HR. The only problem ... Read More »
Having just killed one old seat, another on the way out, and my only remaining seat currently NOT agreeing with my hind end, I just realized that I'm pretty much out of decent seats - so what better time than to make the switch? I'm intrigued by the I-beam system and am considering ordering up a sea ... Read More »
I'm currently running an EC90 seat post (190g) and WTB Sillverado saddle (200g). The saddle leaves something to be desired in the comfort stakes and my shorts get caught on the saddle nose.
Has anyone got any I-beam saddle and post set ups that are reliable and comfortable that are lighter than th ... Read More »