The world's most in-depth and scientific reviews of outdoor gear

Sidi SD15 Review

A great concept but poor execution from one of the top mountain bike shoe companies in the business.
Sidi SD15
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Price:  $225 List | $179.99 at Amazon
Compare prices at 2 resellers
Pros:  Grippy rubber soles, walks well, solid closures
Cons:  Expensive for performance, terrible power transfer, minimal foot protection, thin footbeds
Manufacturer:   Sidi
By Jeremy Benson ⋅ Senior Review Editor  ⋅  Aug 30, 2017
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61
OVERALL
SCORE


RANKED
#17 of 17
  • Power Transfer - 30% 2
  • Comfort - 20% 6
  • Traction Walkability - 20% 10
  • Weight - 15% 8
  • Durability - 15% 7

Our Verdict

The Sidi SD15 is a clipless mountain bike shoe aimed squarely at the all-mountain and adventure market made by one of the top bike shoe manufacturers in the business. Sadly, the SD15 fell short of the bar set by the other shoes in our selection with the most flexible soles and poorest power transfer of all models tested. The shoe does have many great features, like grippy rubber soles, excellent off-the-bike walking performance, and reliable closures, and may be a good fit for certain types of riders. That said, performance-oriented mountain bikers will probably be much happier with any of the other models in this test — especially similarly priced models like the Giro Terraduro, the Specialized 2FO Cliplite, or the Shimano ME7. All offer equally good traction off the bike and far superior power transfer and performance on your shred sled.


Compare to Similar Products

 
Sidi SD15
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Sidi SD15
Awards  Editors' Choice Award Top Pick Award  Top Pick Award 
Price $179.99 at Amazon
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$164.95 at Competitive Cyclist
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$180 List$200.00 at REI
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$180.00 at Amazon
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Overall Score Sort Icon
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Star Rating
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Pros Grippy rubber soles, walks well, solid closuresLightweight, comfortable, stiff, great power transfer, vibram soles, customizable insolesLightweight, comfortable, versatile, Boa closures, styling, reasonable priceGrippy rubber soles, good foot protection, comfortable, great power transfercomfortable, versatile, great traction while hiking, boa closures, good style
Cons Expensive for performance, terrible power transfer, minimal foot protection, thin footbedsNo on-the-fly adjustments, limited foot protection, expensiveRoomy toe-box, slip-not rubber could be more grippyPotential durability issuesSometimes too grippy for a clipless focused shoe, heavy
Bottom Line A great concept but poor execution from one of the top mountain bike shoe companies in the business.The Empire VR90 is the lightest, stiffest, and most comfortable shoe in our test and the winner of our Editors' Choice award.Our Top Pick for Trail Riders, the 2FO Cliplite is a unique looking shoe packed with performance and features from one of the biggest brands in the bike industry.The ME7 is a thoughtfully designed, versatile, and high performance all mountain and enduro shoe.The Five Ten Kestrel Pro Boa is our Top Pick for Enduro Racers and those partaking in regular extensive hike-a-bike sections
Rating Categories Sidi SD15 Giro Empire VR90 Specialized 2FO Cliplite Shimano ME7 Five Ten Kestrel Pro Boa
Power Transfer (30%)
10
0
2
10
0
10
10
0
8
10
0
8
10
0
8
Comfort (20%)
10
0
6
10
0
9
10
0
9
10
0
9
10
0
9
Traction Walkability (20%)
10
0
10
10
0
7
10
0
9
10
0
10
10
0
9
Weight (15%)
10
0
8
10
0
10
10
0
8
10
0
8
10
0
6
Durability (15%)
10
0
7
10
0
9
10
0
9
10
0
6
10
0
9
Specs Sidi SD15 Giro Empire VR90 Specialized 2FO... Shimano ME7 Five Ten Kestrel...
Closure Tecno 3 closure system and velcro straps Laces 2 Boa S2-Snap dials, velcro strap over the forefoot Speed lace system and upper ratchet strap, Large velcro panel over laces Boa dial plus velcro at toe box
Measured Weight 416 grams 388 grams 426 grams 425 grams 511 grams
Width Options Regular regular and high volume Regular Regular Regular
Upper Material Politex suede effect upper, mesh Microfiber Thermobonded upper Synthetic Synthetic
Footbed Nylon/Polyester molded EVA footbed Specialized Body Geometry Extra-cushion insole OrthoLite
Sole Politex Suede Effect Upper, mesh Easton EC90 Carbon Fiber Nylon Composite Carbon fiber composite sole/midsole Carbon-infused nylon shank
Outsole Suola Outdoor, rubber Vibram Mont Molded Rubber High Traction Lugged Outsole, Mid-Foot Scuff Guard, Accomodates Steel Toe Spikes SlipNot rubber sole Michelin rubber outsole Steatlh C4 rubber
Size Tested 44 45 43.5 44 10.5

Our Analysis and Test Results

We have to admit that we were excited when we saw the SD15. It seemed like the Italian bike shoe giant Sidi had finally made a mountain bike shoe with a grippy walkable sole, and we assumed that it would have their signature XC style performance that we have come to know and love. Unfortunately, that was not the case. The SD15 fell short of the bar set by all of the other shoes in our test selection. The SD15 has been designed with all-mountain and trail riding in mind, and we found it to be best suited for that style of riding. Due to the more flexible nature of the soles on the SD 15, it works best with pedals that have medium or large platforms to help maximize what little power transfer these shoes provide.

Performance Comparison


The SD15 was the least stiff shoe in our entire test  with a sole so flexible we find it hard to believe it's meant to have a cleat mounted to it. Look closely and you can see the sole flexing under pedaling force.
The SD15 was the least stiff shoe in our entire test, with a sole so flexible we find it hard to believe it's meant to have a cleat mounted to it. Look closely and you can see the sole flexing under pedaling force.

Comfort


Off the bike, the SD15 is a reasonably comfortable shoe. The soft Politex Suede synthetic uppers are soft and supple and conform to your feet within minutes of putting them on. The shoe features one of Sidi's Tecno 3 cable closures that crisscrosses over the upper part of the foot while a simple Velcro strap secures it down by the toes. Unfortunately, these shoes aren't just made for walking around in, because they are comfortable for that purpose. On the bike, these shoes are uncomfortable for several reasons.

There is very minimal padding, mainly the tongue and around the top of the ankle opening, as well as Sidi's signature molded plastic heel cup. Otherwise, the shoe offers little to no protection for the feet, and we felt especially vulnerable in these shoes. Just like the Sidi Cape, the footbed of the SD15 is wafer thin and offers little support or cushioning. The Sidi "Outdoor Sole" lacks a stiff shank in the sole which allows it to flex under power. The flex of the sole leads to strain and even cramping of the feet both when pedaling and descending. Walking on rocks - one of this shoe's strong points - is even somewhat uncomfortable since you can feel the points of the rocks through the sole. Sure these shoes fit nicely, but that's about where the comfort ends.

The SD15 is a relatively comfortable shoe. It's unfortunate that it's not stiff enough for its intended purpose of mountain biking.
The SD15 is a relatively comfortable shoe. It's unfortunate that it's not stiff enough for its intended purpose of mountain biking.

Weight


The SD15 weighs 416g per shoe for the size 44 that we tested. It's by no means the lightest shoe out there, but far from the heaviest. The shoes feel light in your hand and also on your feet. That said, the SD15 weighs about the same as several other shoes in our test selection that offer significantly better power transfer and overall performance such as the Shimano ME7 or our top pick for trail riders, the Specialized 2FO Cliplite. Anyone looking for a lighter and less expensive pair of shoes with far superior power transfer need look no further than our Best Buy award winner, the Giro Privateer R.

At 416g per shoe in a size 44  the SD15 weighs similar to the enduro oriented shoes in our test.
At 416g per shoe in a size 44, the SD15 weighs similar to the enduro oriented shoes in our test.

Power Transfer


Contrary to our expectations, the SD15 failed to deliver the power transfer that Sidi shoes are typically known for. In fact, the SD15 scored the lowest of all shoes tested in that category. As far as we can tell, there is no shank whatsoever in the shoe, and this is evidenced by the fact that you can fold them in half. The shoes flex under power, and you can feel the pedal through the sole of the shoe. This results in foot fatigue, soreness, and even cramping. While riding, you could also feel the sole flex laterally around the cleat. This took us off guard, and it is unclear why a mountain bike shoe with clipless pedal compatibility would be made with such little support in the sole, especially for $200.

If you can literally fold a shoe in half then it must not have any sort of shank to provide a pedaling platform. The SD15 provided almost no support and caused fatigue in our feet and legs while climbing and descending.
If you can literally fold a shoe in half then it must not have any sort of shank to provide a pedaling platform. The SD15 provided almost no support and caused fatigue in our feet and legs while climbing and descending.

Traction Walkability


One of the SD15's strongest points is its traction and walkability. We might even go out on a limb and say that this shoe is better for walking than it is for riding. Sidi's "Outdoor Sole" is a full coverage rubber sole with large well-spaced lugs under the heel and the forefoot. The rubber isn't as soft as that found on the Five Ten Hellcat Pro or the Giro Terraduro, but it is still very grippy and offered excellent traction on virtually all surfaces. The wide spacing of the lugs cleared mud, snow, and other debris with ease. The walkability of the SD15 is made even better because the sole offers full flex from toe to heel, much like a pair of running or hiking shoes, so it is not inhibited in any way by a shank or anything similar. The lack of shank in the sole is disconcerting in many ways, and it means that you can feel sharp rocks through the sole when you step on them.

If this were a hiking shoe test the SD15 would have done very well. Its traction and walkability were its best attributes.
If this were a hiking shoe test the SD15 would have done very well. Its traction and walkability were its best attributes.

Durability


Despite our general lack of enthusiasm for the performance of the SD15 we have to admit that it appears to be a well-made product. So far there are no durability issues to report. The soles look almost brand new. The stitching is all intact, and there is barely a scratch on the uppers. The closures have also worked flawlessly thus far.

They may not have put a signature stiff Sidi sole in the SD15  but it appears to made with their typical quality construction.
They may not have put a signature stiff Sidi sole in the SD15, but it appears to made with their typical quality construction.

Best Applications


The SD15 is unlike any other in our test selection and it is somewhat of a struggle to pinpoint the best use for this shoe. It is very far from an XC shoe, and it lacks the stiffness and power transfer that nearly all types of riding require. We do feel that perhaps adventure style riders, those who spend equal time walking and riding, may find a spot in their heart for these shoes. Also, infrequent recreational riders who value walkability and durability over power transfer might enjoy these.

Value


At a retail price of $200, we do not feel that the SD15 is a good value due to the poor power transfer and on the bike performance. We are a little surprised by this due to Sidi's long-standing reputation as one of the best shoe manufacturers in the business. For the money, we would recommend the Giro Terraduro, the Shimano ME7, or the Specialized 2FO Cliplite which all offer equally good walkability with far superior on-the-bike performance. Our Best Buy award winner, the Giro Privateer R, also offers much better on-the-bike performance for $80 less.

We had high expectations for the SD15. Unfortunately  they were not met as this was the poorest performing shoe in our test.
We had high expectations for the SD15. Unfortunately, they were not met as this was the poorest performing shoe in our test.

Conclusion


Our expectations for the SD15 were met with a truly underwhelming performance due to inferior power transfer and on-the-bike performance. While we like the concept of a walkable Sidi mountain bike shoe with a grippy rubber sole, they failed to create one that excels at the shoe's primary task, riding a bike. If only they would glue this sole to the bottom of one of their proven high-performance models, then they would be on to something.


Jeremy Benson