Sidi Genius 6.6 Vent Carbon Mega (Wide) Shoes

Sidi Genius 6.6 Vent Carbon Mega (Wide) Shoes
  • Color: Black Vernice/White
  • Color: Blue Vernice/White
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Just because Sidi's Genius 6.6 Vent Carbons took multiple victories in the Tour de France and Giro d'Italia doesn't mean Sidi wouldn't make them even better. Thanks to their T700 carbon soles, these shoes (the Megas are the wide-fit version) are light and stiff for awesome pedal power. The closeable vented soles provide airflow, while the breathable Lorica/mesh uppers offer luxurious comfort and keep you cool and dry. Plus, Sidi's Soft Instep Closure System, Caliper buckles, High Security Velcro straps, and Adjustable Heel Retention Device provide a truly custom fit that keeps you feeling great on even your most epic rides. What's more, Sidi's handmade carbon soles are crafted in the same Italian factory that makes Ferrari and Ducati parts so you know these shoes are fast.

Fitting Yourself to Sidi Cycling Shoes

There is no substitute for a perfect fit. Your shoes are the most important contact point between you and your bike, affecting power, comfort, and providing that locked-in feeling of oneness with your bicycle.

Fitting tips
Try shoes on at the end of the day — your feet swell by at least a half-size as the day progresses, and as much as a full size on hot days.

Stand up. Feet expand under pressure — standing up will give you a better sense of how your shoes will fit under pedaling pressure.

Bring the socks and orthotics you ride with — they have a tremendous influence on foot volume and fit.

Be patient! Non-leather cycling shoes do not stretch over time — how they fit in the store will be how they fit, period. However, as the shoes warm up from body heat the uppers will become more pliable and conforming. Give your shoes at least 10 minutes to heat up, and readjust the closures to accurately gauge how they’ll feel mid-ride.

Foot measuring devices typically measure length and width only, and do not account for overall shape or foot volume. It’s imperative that you try on shoes a half-size larger and smaller than your measured size, for confirmation of proper fit.

How Sidis are sized
Sidi half sizes are 3mm longer, with slightly increased toe box volume. Full sizes are 6mm longer, with proportionally greater volume.

Standard-size Sidis roughly correspond to a D width on the industry-standard Brannock sizing scale.

Mega sizes are cut with more material throughout, and larger-volume heel cups. Mega sizes roughly correspond to an EE/EEE width on the Brannock sizing scale.

Narrow sizes are cut with less material throughout, and narrower, lower-volume heel cups. Narrow sizes roughly correspond to a B/C width on the Brannock sizing scale.

Women’s Sidis have a more tapered shape and lower volume than standard or narrow-width Sidis. Women with consistently wide or narrow feet, from heel to the forefoot may experience better fit in Sidi standard or narrow widths.

The four common cleat bolt patterns.
In order to mount your pedal cleats to your shoes (cleats are included with new pedals and sold separately), the cleats and shoes must have matching bolt patterns. 

There are four cleat configurations found on cycling shoes (diagram): SPD-R, Look/SPD-SL, SPD and Speedplay. Road shoes feature one, two or even three of these. Off-road shoes usually use the SPD pattern. If you're unsure which cleats your shoes require, please ask us. We're here to help!

Sidi's Vent Carbon sole.

Sidi's Vent Carbon soles optimize your power transfer and ensure top comfort, too. They deflect just 1.4mm when 110 pounds is suspended from the tip. Plus, a small degree of toe flex is built in so you enjoy comfort mile after mile.

Another great feature is the built-in adjustable vents at the front of the soles that can be set to let in or seal out the air. When open, the vents work with the channels beneath the perforated footbeds for excellent airflow and comfort.

Lorica is a lightweight, flexible, water repellent and breathable material made of the finest microfibers. It's amazingly durable and, like leather, it improves with age.

Sidi Soft Instep Closure System
Sidi's Soft Instep Closure System is anatomically shaped to eliminate pressure points in order to provide a snug, secure, and ultra-comfortable fit.
Sidi's Caliper buckles make it super easy to fine-tune how tight your shoes are even when you're riding. Simply lift the Ratchet Levers to tighten, and press the Side Levers to loosen the fit or release the strap.

Sidi's Adjustable Heel Retention Device provides a snug, customizable fit around your heels and ensures maximum pedal power. Simply turn the screws in the back of the Retention Device to tighten or loosen the fit and eliminate slippage.

Fit Relievers are tiny cuts in the tongue that reduce bulk and keep it from rolling over and digging into your foot.

Part Numbers

Option UPC MPN
Black Vernice/White / 40 2000000410142 13102212400
Black Vernice/White / 40.5 2000000410159 13102212405
Black Vernice/White / 41 2000000410166 13102212410
Black Vernice/White / 41.5 2000000410173 13102212415
Black Vernice/White / 42 2000000410180 13102212420
Black Vernice/White / 42.5 2000000410197 13102212425
Black Vernice/White / 43 2000000410203 13102212430
Black Vernice/White / 43.5 2000000410210 13102212435
Black Vernice/White / 44 2000000410227 13102212440
Black Vernice/White / 44.5 2000000410234 13102212445
Black Vernice/White / 45 2000000410241 13102212450
Black Vernice/White / 45.5 2000000410258 13102212455
Black Vernice/White / 46 2000000410265 13102212460
Black Vernice/White / 46.5 2000000410272 13102212465
Black Vernice/White / 47 2000000410289 13102212470
Black Vernice/White / 48 2000000410296 13102212480
Blue Vernice/White / 40 2000000089935 12102232400
Blue Vernice/White / 40.5 2000000089942 12102232405
Blue Vernice/White / 41 2000000089959 12102232410
Blue Vernice/White / 41.5 2000000089966 12102232415
Blue Vernice/White / 42 2000000089973 12102232420
Blue Vernice/White / 42.5 2000000089980 12102232425
Blue Vernice/White / 43 2000000089997 12102232430
Blue Vernice/White / 43.5 2000000090009 12102232435
Blue Vernice/White / 44 2000000090016 12102232440
Blue Vernice/White / 44.5 2000000090023 12102232445
Blue Vernice/White / 45 2000000090030 12102232450
Blue Vernice/White / 45.5 2000000090047 12102232455
Blue Vernice/White / 46 2000000090054 12102232460
Blue Vernice/White / 46.5 2000000090061 12102232465
Blue Vernice/White / 47 2000000082769 12102232470
Blue Vernice/White / 48 2000000090078 12102232480