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In Stock & Ready To Ship — XT/Ultegra RT-MT800 Disc Rotors
Sidi Defender 20 MTB Shoe Black - 41
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Sidi Defender 20 MTB Shoe

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Backorder: This item is currently out of stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

Trail ready — Sidi Defender 20

Blending the best features of a comfortable hiking shoe and an XC and trail riding shoe, the Sidi Defender 20 Shoe offers the perfect grip in a variety of conditions. Striking a balance between remaining incredibly stiff yet lightweight, the Defender 20 is the perfect shoe for those times when you're caught in a steep hike-a-bike section of trail. The tread of the Defender 20 gives you the comfort you need while walking without compromising on power transfer when on the bike.

Sidi's Politex uppers are constructed of several different thin layers to create a supportive and durable material designed to stand up against the debris you face out on the trails.

Impressively supportive soles are just one detail that makes Sidi shoes stand out. The Defender shoe uses Sidi's Outdoor Sole. The grippy rubber sole not only adapts to variable trail conditions but keeps you stable while on foot. Clipping back into your pedals after traipsing through muddy off-bike sections, now comes more quickly. The Defender's tread pattern sheds the mud blocking you from clipping in, so you can be on your way much easier.


  • The shoe for all your mountain adventures
  • Sidi's Outdoor Sole is grippy and adaptable to trail conditions, keeping you stable and secure.
  • The Politex uppers are super durable and tough
  • The Tecno-3 closure cinches down by the millimeter, allowing you the perfect fit for optimal comfort and performance
  • Your foot isn't going anywhere with Sidi's reinforced heel cap.

Free Exchanges: This product qualifies for free exchanges within the first 60 days after order. We'll cover the shipping both ways for US customers if you need a different size and/or color of this product. Returned product must be in new condition with all labels and packaging. Free exchanges apply only for product in stock or available for backorder.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. Cleats may have been mounted leaving minor marks on the soles. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

This size chart provides our best estimate for which European shoe size to choose based on your US shoe size. This will not necessarily match the US size shown on the product, but it is the best guidance we can provide for this particular brand.

If we've noticed that any particular model deviates from the standardized chart, we will list this information in the product description.

Please contact us with any questions.

Upper: Politex Suede Effect, mesh 

Footwear Closure: Tecno 3 Buckle System 

Outsole: Sidi Outdoor Sole 

Cleat Compatibility: 2 Hole 

Manufacturer Warranty: 1 year 

Discipline: trail/enduro/XC 

Width: Regular 

Black - 41

Mfg PartNum: SMS-D20-BKBK-410 

Black - 42

Mfg PartNum: SMS-D20-BKBK-420 

Black - 43

Mfg PartNum: SMS-D20-BKBK-430 

Black - 44

Mfg PartNum: SMS-D20-BKBK-440 

Black - 45

Mfg PartNum: SMS-D20-BKBK-450 

Black - 46

Mfg PartNum: SMS-D20-BKBK-460 

Black - 47

Mfg PartNum: SMS-D20-BKBK-470 

Black - 48

Mfg PartNum: SMS-D20-BKBK-480 

Ordered by Most Relevant First
5 stars
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1 stars
Reviewed 10/12/2021
by Robert in the Desert
Cycling Enthusiast
Carson City, Nevada
Value Rating
Overall Rating
1 of 1 customers found this review helpful.
Great Shoes,

The shoes work well as I do a lot of exploration that frequently involves walking, scrambling etc. on a variety of terrain. They are of always good Sidi quality and fit, and, have design features that are not in their more race oriented shoes, for example a toe cap that resists wear. I have had problems with other shoes that the toes wear through before the rest of the shoe. My only criticism of the shoe is that the winder that tightens the laces is very prone to dust infiltration. Once in a while it is nessesary to blow the doodad out with an air hose and lubricate it with a touch of silicone. So,,,, so far so good!

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Reviewed 6/28/2021
by John
Cycling Enthusiast
Value Rating
Overall Rating
2 of 3 customers found this review helpful.
Strange fit

I have a pair of these. I spent a lot of time fiddling with insoles to make them work. The heel is really wide and I had to add a number of lifts to bring my foot up into the heel pocket so it won't slip. Then the front part of the shoe is quite tight. Eventually I had to take out the standard insoles and replace them with a 3/4 length insole (at the suggestion of Sidi - they know it's tight in the front). The removal of the velcro strap from the SD15 and replacing it with a 3 level long boa style closure means that the forefoot will always tend to be too tight (hence, the 3/4 length insole).

I have regular Sidi mtb shoes and road shoes and they all fit perfectly. These are just a strange fit but the shoe had so much promise for gravel. Hopefully Sidi goes back and gets this right - tighten up the heel, open up the front, reduce the travel of the boa from 3 eyelet sets back to two and add either a second boa or a velcro toe strap. Then this will be a winner. Until then? Just an odd fitting shoe.

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Reviewed 8/16/2021
by Scott B
San Diego
Overall Rating
Great trail shoe

Sidi are great shoe and quality, I have several trail/enduro shoes, these are my go to on warm summer days, they flow more air than my other shoes

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Reviewed 8/25/2021
by Scott B
San Diego
Overall Rating
Great trail shoe

Sidi are great shoe and quality, I have several trail/enduro shoes, these are my go to on warm summer days, they flow more air than my other shoes

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Reviewed 4/22/2021
Cycling Enthusiast
Value Rating
Overall Rating
0 of 1 customers found this review helpful.


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