Save At Least 40% on Cold-Weather Apparel From Castelli & More »
  • Free Shipping on orders over $50*
  • 100% Guaranteed Returns

Sidi Genius 6.6 Vent Carbon Shoes


Item # SID0110

Select options
  • Select options
  • Black Vernice/White, 39.0 ($399.95)
  • Black Vernice/White, 39.5 ($399.95)
  • Black Vernice/White, 40.0 ($399.95)
  • Black Vernice/White, 40.0/Wide ($399.95)
  • Black Vernice/White, 40.5 ($399.95)
  • Black Vernice/White, 40.5/Wide ($399.95)
  • Black Vernice/White, 41.0 ($399.95)
  • Black Vernice/White, 41.0/Wide ($399.95)
  • Black Vernice/White, 41.5 ($399.95)
  • Black Vernice/White, 41.5/Wide ($399.95)
  • Black Vernice/White, 42.0 ($399.95)
  • Black Vernice/White, 42.0/Wide ($399.95)
  • Black Vernice/White, 42.5 ($399.95)
  • Black Vernice/White, 42.5/Wide ($399.95)
  • Black Vernice/White, 43.0 ($399.95)
  • Black Vernice/White, 43.0/Wide ($399.95)
  • Black Vernice/White, 43.5 ($399.95)
  • Black Vernice/White, 43.5/Wide ($399.95)
  • Black Vernice/White, 44.0 ($399.95)
  • Black Vernice/White, 44.0/Wide ($399.95)
  • Black Vernice/White, 44.5 ($399.95)
  • Black Vernice/White, 44.5/Wide ($399.95)
  • Black Vernice/White, 45.0 ($399.95)
  • Black Vernice/White, 45.0/Wide ($399.95)
  • Black Vernice/White, 45.5 ($399.95)
  • Black Vernice/White, 45.5/Wide ($399.95)
  • Black Vernice/White, 46.0 ($399.95)
  • Black Vernice/White, 46.0/Wide ($399.95)
  • Black Vernice/White, 46.5 ($399.95)
  • Black Vernice/White, 46.5/Wide ($399.95)
  • Black Vernice/White, 47.0 ($399.95)
  • Black Vernice/White, 48.0 ($399.95)
  • 100% Guaranteed Returns

  • Free Shipping

    on orders over $50
Item # SID0110


Comfort is a right.

Comparing the Genius 6.6 Vent Carbon Shoes to Sidi's flagship Wire shoe, you're bound to uncover numerous shared design features. You'll find the same carbon fiber sole, the same adjustable Heel Security System (HSS), and an identical intake vent system. In fact, the two really only part ways on a few points-- aesthetics, a closure system, and price.

Hailed as Ivan Basso's favorite shoes, the Genius 6.6 features a more traditional exterior design than the Wire. This is most apparent when examining the shoes most predominant aesthetic features, the closure system. In lieu of the Wire's Techno 3 buckle system, the 6.6 opts for Sidi's tried-and-true, two-way ratcheting Caliper Buckle. Assuredly, you've seen the Caliper Buckle imitated by lesser shoemakers, however, this design was invented by Sidi decades ago. The system allows for incremental adjustments, either pre-ride or on-the-fly, and it's further complimented by Sidi's take on two hook-and-loop straps. Not your standard Velcro, these two volume-controlling straps feature Sidi's patented High Security Velcro. So, you'll never experience any fraying, wear, or loosening of the Velcro over any period of time. Together, as a system, the three-point closure system ensures that you get the perfect fit every single time that you buckle up for a ride. And for those who prefer as snug a fit as possible, the shoe's tongue and instep strap have both been padded generously to allow for supreme comfort with tight buckles.

As we stated, the Genius 6.6 shares the same sole as the Wire. Based off of the Ergo 3, the 6.6 sole features the superlative vented carbon fiber. It shares the same construction method that Sidi developed with its Carbon Lite sole, yet Sidi has removed around 38 grams in the process. Even with the weight savings, you'll get the same kind of stiffness and razor sharp power transfer you've grown to expect from Sidi. And like Garneau's Ergo Air system, the vent inlet is at the toe. However, Sidi's system can be opened or closed depending on the temperature and your preferences. This, you can do on the bike if necessary. The airflow moves underneath and through the insole to cool your feet in sweltering summer temperatures.

Also returning from previous top-shelf offerings is Sidi's vastly improved Heel Security System (or HSS) to keep your foot positively planted in the shoe. By means of a small allen key, it's an adjustable, rigid composite band that closes the shoe more securely over your heel to anchor it in place around your Achilles. So, no matter how much power you're pouring into the pedals, your heel will stay in place inside the shoe. It's a detail that allows you to cinch down the straps of your shoes less tightly -- giving you more comfort along with more security.

With a degree of engineered flex in the Vent Carbon Sole, and a secure and slip-free heel, you won't have to worry about hot spots. And you especially don't have to worry about heat in the rest of your feet, either. With the Genius' combination of Lorica microfiber, ballistic mesh, and new Comfort Fit insoles, you'll receive comfort, a perfect fit, ample ventilation, and season-after-season durability.

The Sidi Genius 6.6 Vent Carbon Shoes are available in the color Black Vernice/white and in whole and half sizes from 39 to 48. Most sizes also have an Mega option available for those requiring a high-volume shoe. Please note that these shoes are only compatible with standard, three-hole road cleat systems.

Tech Specs

Upper Material:
[uppers] Lorica Vernice Microfibre, [ventilation] ballistic mesh
main strap with ratchet closure, 2 hook-and-loop straps
carbon fiber
Cleat Compatibility:
3-hole road
Sidi Comfort Fit
Recommended Use:
road racing
Manufacturer Warranty:
1 year

Size chart

Sidi Men's


Find your Sidi size with your EU size.


Cycling Footwear
38 5
38.5 5.5
39 6
39.5 6.25
40 6.75
40.5 7
41 7.5
41.5 8
42 8.25
42.5 8.75
43 9.25
43.5 9.5
44 9.75
44.5 10.25
45 10.5
45.5 11
46 11.5
46.5 11.75
47 12.25
48 13
49 14
50 15
51 16
52 17

Reviews & Community

What do you think of the

Sidi Genius 6.6 Vent Carbon Shoes

? Share a...

Write a review

No file chosen

Rather attach a photo from another website?

Rather attach a photo from your computer?

    Add a:
  • Share a photo
  • Share a video


Only jpg, jpeg, png, gif or bmp files please.

Submit Cancel

Here's what others have to say...

5 5

Worth the premium price

  • Familiarity: I've used it once or twice and have initial impressions

I bought these to replace my white Sidi Ergo 3, which also had a similar color combo, carbon weave sole, a vent, and a ratcheting top strap, but with 2 rotary tightening fasteners like on the current model Wire. The wire fasteners on the Ergo 3 worked, and the nylon wire surprisingly never broke, but I was never a fan of twisting to tighten, and found it a little awkward and gimmicky.

I replaced my Ergo 3 with these 6.6 Vent because I really like the ratcheting strap but personally find the 2 lower Velcro(R) straps more convenient, reliable, and intuitive to use. The carbon sole on the 6.6 Vent is extremely stiff, which I actually find to be highly comfortable in how efficiently it transfers power to the pedals. I leave the vent "open" for the hot Texas days, though I can't say for sure that I notice the difference. Could be because they are still new, but I feel like the footbed is more comfortable than my old Ergo 3s were. My first ride on the 6.6 Vent was a hot, brisk century, and I had no issues the entire ride.

These are not cheap, but for me, the combination of features and overall high-end materials and design justify the premium price. If I bought a 2nd pair as an alternate I would look at one of the more value-priced Sidi shoes which are probably also great for the money.

5 5


  • Familiarity: I've put it through the wringer

I wore these for a hard 8000 miles season last year and am on my second with them. The shoes are super durable look decent, fit pretty darn good and are well ventilated. I have a longer second toe so I do have some issue with the fit as far as length. I imagine if you have normal feet these would totally rock your world. I will probably go semi to full custom next pair of shoes, but overall Sidi is a stand out brand that will make your cycle feet happy.

5 5

Just like Ivan Basso

  • Familiarity: I gave it as a gift but have feedback to share
  • Fit: True to size

Bought these for my dad who has worn a pair of Sidi's for about five years this pair. So far he has worn them on a couple of rides and says that they fit very similar to other Sidi's he has worn. He loves how the venting and how well air moves through. All in all it is a great quality Italian shoe; stiff, lightweight and well made would recommend this product.

5 5

Great Italian Quality

  • Familiarity: I've put it through the wringer

This is a superb pair of shoes. I purchased a pair back in the summer and love the quality and fit of these. They are very ventilated and i do not get hot spots when wearing them. I am a US size 11 and the 45.5 fit perfectly. They stay nice a snug on the feet and the straps are very easy to adjust. This is my second pair of Sidi's. The first pair lasted me 8 years so they have awesome quality. Just what you would expect from an Italian shoe.

Great Italian Quality
5 5

Too Big!!

  • Familiarity: I returned this product before using it

I recently found that normal shoes do not fit me well. I have wide feet. After trying a size 44 at a store I decided to order the 44 MEGA. When I received them I realized that they were too big. Competitive Cyclist does not have the 43.5 MEGA in this style so I order the Sidi 5 Carbon and I will see how they fit. They look like a really good shoe very disappointing they don't have my size.

5 5

The Best Road Shoe

I have ridden Sidi's for the last 5 years. My first pair were Genius 5. I would rate them fair. These Genius 6.6 are excellent. They have addressed all the issues I had with the 5's. they are extremely well vented., they provide great side support where the 5's had none. The wide size fits my toe box perfectly without allowing me to swim in the rear of the shoe. This shoe actually fits American feet, not just Italian feet! I will keep buying these. 5 stars.