This model comes with multiple seat clamp variants, sometimes called 'ear'. Saddles with steel/metal rails are round sized 7x7mm, carbon bars can be 7x9mm or upto 7x10mm. I need to change the 'ears' to 7x7mm but it is very difficult to find a specialized part for this.

Bought for my hardtail mtb Very useful both for climbing and descending, gives you traction ( while ascending) and confort

It smooths out those rough roads.

I put the CG-R Carbon Seatpost on my 2005 Specialized Tarmac Comp, replacing the original equipment seat post. The CG-R Seatpost took only minutes to install and the ride is awesome. I feel like I am riding a new bike with a super smooth ride and a better pedal stroke.

Fitted perfectly and seat adjustments very easy.

I recently replaced the 12 year old zertz insert post on my Tarmac.The reason ? last summer I bought a cross trail carbon as an alternative bike. It came equipped with this seat post. My bike mechanic said I would love it. He was right. So this year I put one on my Tarmac

I began using this seat post while riding 200 km Brevets and, recently a 300 km Brevet with LOTS of vertical work. Former saddle / post combinations left me quite uncomfortable after 100 km or so and very sore after 200. But this seat post gives enough vertical movement / suspension that, amazingly enough, I feel fine. OK, the 300 km was a bit toasty but it's a GREAT piece of equipment. I MOST strongly recommend it. PS: Specialized, could you think about making it in other diameters?