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The Deda Superleggero RS seatpost is very light, good looking and pretty easy to use. It's an expensive way of shaving some weight from your bike, though, if saving weight is your main concern.
Made from undirectional carbon fibre, the Superleggero has a 12mm setback and it's available in 350mm and 400mm lengths and 27.2mm and 31.6mm diameters; that'll cover most road bikes. The clamp is described as a single bolt by Deda but really it's two: one at the front to set the saddle angle and one at the back to tighten everything up. Once you have your saddle angle set, you can remove the saddle using just the one bolt, although it's still easier if you undo both. The Superleggero is compatible with Di2 batteries using Deda's adaptor.
I removed the standard seatpost from my mid-range Merida Scultura and replaced it with this one. The outgoing same-length (350mm) seatpost weighed 257g and the Superleggero is 167g, so that's a not-insignificant saving of 90g. That equates to a hairsine ratio (see here) of just over 0.5: half a gram saved for every pound spent. As you can see from the chart on this page, there are more cost-effective ways of saving the weight, not least buying a cheaper-but-still-lightweight seatpost. It's quite an expensive way of shaving the grams, really.
Obviously, fitting a posh new seatpost is not just about saving weight. You want it to be effective too, and the Superleggero is fairly easy to get on with. The double bolt clamp makes adjusting the seat angle a precise operation, rather than loosening everything off and adjusting and tightening again. The rear bolt is right under the saddle; if you have a split saddle you'll be able to adjust it using a 5mm hex key, but if you don't you'll need to use the knurled wheel which is a bit of a fiddle. I've generally found that wheels like the one used here can gum up after wet or dirty rides, but unless you're altering your saddle angle a lot, or switching saddles, it's mostly a case of remembering to strip, clean and grease the mechanism from time to time.
Deda doesn't make any specific claims for how much more compliant the Superleggero is than its competitors. It's a light post, and there's a bit of lateral give in it, especially as I tend to run plenty of seatpost. My Merida isn't an uncomfortable bike, and it's running 28mm tyres, so it was hard to discern any direct benefit from the swap; it's a marginal improvement at best.
Lastly, you want your posh seatpost to look cool. There's no point paying £185 for a seatpost if it doesn't look cool, right? No worries on that front: the Superleggero is a very good-looking seatpost, with a nice organic shape and graphics that are bold without being too intrusive. Certainly it's a much nicer looking 'post than the workaday one it replaced.
Overall, the Deda is a decent post, but it doesn't really do anything to make it stand out and the £185 asking price feels a bit steep compared to other options like the Reilly carbon seatpost we tested eariler in the year: that's even lighter, and half the price.
If you're looking for a bling Italian seatpost to adorn your bling Italian Sunday-best bike, though, it might fit the bill.
Nice lightweight seatpost that's easy enough to use, but expensive for what it is
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road.cc test report
Make and model: Deda Superleggero RS Seatpost
Size tested: 27.2mm diam, 350mm length
Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?
Deda says, "New 176 grams ultralight seatpost designed and developed without compromises in terms of reliability and strength. The 1-bolt clamp system allows an easy and fast assembly. A fine adjustment of the saddle inclination is possible through the adjusting screw on the seatpost head."
[note: our 27.2mm diameter 350mm long post weighed in at 167g]
Tell us some more about the technical aspects of the product?
Material: UD full carbon construction
Length: 350 mm; 400 mm (black only)
Diameter: Ø 27,2 and 31,6 mm
Setback: 12 mm
Weight: 176 g (Ø 31,6 mm)
Finish: polish on black (POB); black
Compatible with Deda adapter for DI2 internal battery
Tell us how the product performed overall when used for its designed purpose
It held the saddle away from the frame just dandy.
Tell us what you particularly liked about the product
Light, good looking.
Tell us what you particularly disliked about the product
Expensive, wheel adjustment difficult on some saddles and prone to sticking.
How does the price compare to that of similar products in the market, including ones recently tested on road.cc?
You can pay more, but equally carbon seatposts of a similar weight are available for a lot less.
Did you enjoy using the product? Inasmuch as you enjoy using a seatpost, yes.
Would you consider buying the product? Probably not.
Would you recommend the product to a friend? Probably not.
Use this box to explain your overall score
Performance is good, value not so much. Of the options out there it wouldn't be top of my list.
About the tester
I usually ride: whatever I'm testing... My best bike is: Kinesis Tripster ATR, Merida Scultura
I've been riding for: Over 20 years I ride: Every day I would class myself as: Experienced
I regularly do the following types of riding: road racing, time trialling, cyclo-cross, commuting, touring, club rides, sportives, general fitness riding, fixed/singlespeed, mountain biking, Mountain Bike Bog Snorkelling, track
Dave is a founding father of road.cc, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.