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PostPosted: Tue May 13, 2014 3:07 pm 

Joined: Tue Apr 29, 2014 9:29 pm
Posts: 2
Riders, I have the official word on this... I recently emailed 3T regarding my Ionic-0 mated to my Selle Italia Flite gel. below is the response from 3T below my question. Long story short your rails have to be 7x10 not any other variations 8.5, 9, etc to use the Oval end caps. I think that the labeling should state this explicitly and we as purchasers should not have to interpret the cryptic PDF illustration which reads like a range of oval rails sizes and not an exact size...:


to info

The Great:

I have been the proud owner of a 3T Ionic - 0 Stealth Team seatpost as well as a few other well placed 3T products for a about a year now.

Originally I had my 3T Ionic - 0 Stealth Team seatpost mated to a round rail Fiziz Arione R3 Team Sky edition saddle with no issues what so ever.

Recently I've decided to do some endurance rides and settled on adding a Selle Italia Flite Gel saddle to the line up. The Selle Italia does have Titanium ovalized rails, so to complement it, I tracked down a set of hard to find 3T oval rail end caps.

The Not so Great:

After mounting the Selle Italia for the first time I did a metric century. About 3/4 the way thru, I was geting some groin numbness. After getting the Bike back home and cleaned up for the next ride, I did my usual post ride inspection. I noticed that the saddle had slid back and had become nose up, which explains the numbness. It appears, and I guess I did notice/put the pairing to enough rigors riding on the trainer all week in preparation, that the New oval end caps are not 100% securely clamping the rails. I originally torqued to the speced 5nM. After inspecting and now noting the lack of clamping power, the saddle does, if I hold it firmly and wiggle it have fore/aft play.

The Selle Italia rail dimensions are Ovalized 7X8, which by the 3T specs are withing range of the max 7X10.

At this point, since I have another ride this upcomming weekend I wrapped the rails with electrical tape in hopes of providing a little more gripping surface or at the least some non-slip due to the tape.

Have I missed something in the equations of this pairing(3T Ionic - 0 Stealth Team seatpost mated to a Selle Italia Flite Gel saddle)being compatable?

Thank you for your response in advance,

Reply Forward
May 9 (4 days ago)

to me

Hi Anthony,

unfortunately there is a misunderstanding. It is not a range – 7x10 mm max. It needs to be this measure otherwise the saddle can slip.

Best regards

Service Support – Junior Product Manager

3T Cycling srl - Via Vittorio Veneto, 25 - 24041 Brembate - Italy
Tel.: +39 035 4943451 - Fax.: +39 035 4943962

This email is for the use of the recipient only and may contain confidential and/or privileged information.
This email may only be lawfully received, printed, copied and/or used by the specific addressee(s) named above for
the purpose for which it was sent by 3T. If you are not the intended recipient of this email, you must not read, print,
store or use this email for any reason; you are requested to delete it and notify the sender immediately.

Last edited by idgitman on Tue May 13, 2014 7:18 pm, edited 1 time in total.

PostPosted: Tue May 13, 2014 4:23 pm 
User avatar

Joined: Tue Feb 02, 2010 4:22 pm
Posts: 1040
Location: Brooklyn
No doubt what the write on the site is confusing. Just saw that Selle Italia now have carbon rails with the same dimensions as the TI rails so there are some nice options that will not require change of end cap to the oval version.

Posted: Tue May 13, 2014 4:23 pm 

PostPosted: Mon Oct 20, 2014 12:24 pm 

Joined: Tue Mar 04, 2014 3:27 pm
Posts: 13
Has anyone managed to get the ionic to work with specialized carbon railed saddles?

I currently am riding a Doric and am having issues with it destroying bib shorts on one side. Seems to be the clamp design. The ionic seems to be a good solution but i am concerned the 7x9 carbon rails wont be secure. Would a cloth / tape wrap solve this issue?

Would like to avoid switching brands as stem and bars are all 3t though im not overly impressed with their design errors.

PostPosted: Mon Oct 20, 2014 1:22 pm 

Joined: Mon Mar 14, 2011 10:59 am
Posts: 349
Location: Oxfordshire UK
You can file down the edges of the yoke as documented here, works well for me with SLR Kit Carbonio

http://forums.cervelo.com/forums/t/7641 ... ageIndex=2

Scott CR1SL 6.25Kg | CAAD10 6.56Kg

PostPosted: Mon Oct 20, 2014 1:36 pm 

Joined: Tue Mar 04, 2014 3:27 pm
Posts: 13
That's a good hack and would probably solve the issue- but id rather switch out the post and sell it as its relatively new.

Im thinking enve is the best bet for the post but im just not a fan of the bulbous stem.

PostPosted: Mon Oct 20, 2014 8:15 pm 

Joined: Sat Sep 22, 2012 2:22 pm
Posts: 228
You'll really struggle to get the specialized saddle to fit with the ionic. I tried tape and other things to get mine to work but gave up and eventually bought a metal railed saddle.

PostPosted: Sun Jul 19, 2015 2:42 am 
User avatar

Joined: Mon Mar 18, 2013 3:45 am
Posts: 220
Sorry for the grave dig but doing some research on the Ionic's compatibility with Selle San Marco carbon rails. Have seen some pictures of the set up being used but not sure if it was modified to work at all. Selle San Marvo rails are 7x9.8 apparently so pretty close to the 7x10 3T chose to accomodate.

Like most of you I really like the aesthetic and mechanism, this combined with super clearance prices is making it an attractive option but want to make sure it's a good option first.


PostPosted: Tue Dec 08, 2015 9:20 pm 

Joined: Thu Jun 05, 2014 7:57 pm
Posts: 1
Hi Everyone,

I had this exact issue with a new felt AR1 I purchased when installed a specialized carbon railed saddle (romin evo). The oval adapters did not work (too much play, not a good fit at all)

Solution: I filled down the ROUND caps that came with the bike to precisely did the 9mm of the specialized carbon rails. removal of about 2 mm of material.

Works great! Its only just like the oval version except slightly small.

PostPosted: Tue Dec 08, 2015 10:56 pm 

Joined: Wed Jun 24, 2015 11:19 pm
Posts: 69
How did you do the filing, by hand or power tool like a dremel? I have round rails right now but I might want to move to a lighter carbon railed saddle at some point.

PostPosted: Wed Dec 09, 2015 7:50 am 

Joined: Thu Aug 12, 2010 4:42 pm
Posts: 120
I have a Felt AR2 on the way and was planning on a Fizik braided rail saddle. Fizik rails are 7x9mm, so are they not even compatible with the 7x10mm Difflock? :'(

Sent from my Nexus 7 using Tapatalk

PostPosted: Wed Dec 09, 2015 10:11 am 
User avatar

Joined: Mon Jul 07, 2014 8:15 am
Posts: 1347
Location: NorthEU
Anders wrote:
After returning the Ionic as I couldn't get to work with my Specialized Romin Pro saddle with 7x9 rails
I bought a Cranbrothers Cobalt 11 with the 7x9 kit. It has the exact same problem as the 3T Ionic. After some emails forth and back they finally informed me that the saddle was designed only for the Fizik saddles with the wrapping. These are more like 10x8 which is of cause why it can't be clamped down. The wrapping is there to prevent stress points on the carbon rails and adapts to the cups, so it need to fit a bit tigth in the clamps. Well the end result was that I found some fiber tape and wrapped that on the rails with an overlap as to get the right thickness. It seems to work, but will be verified on the road in a couple of months when the snow is gone and the roads are dry.

Buy MCFK or Ax Lightness Europa premium and problem is solved!

I have 10mm oval rails on my Bontrager saddle and no problems at all.

Also have a few Fizik saddles which ofcourse is no problem.

Btw, SMP Dynamic works great to.

11 saddles and all work without hassle.


Ax Lightness Vial EVO D
Paduano Racing Fidia
Open *UP*

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