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ShimanoRX8 Wide Mountain Bike Shoe - Men's


Item # SHI00OO

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  • Black, 45.0 ($260.00)
  • Black, 40.0 ($260.00)
  • Black, 41.0 ($260.00)
  • Black, 42.0 ($260.00)
  • Black, 43.0 ($260.00)
  • Black, 44.0 ($260.00)
  • Black, 46.0 ($260.00)
  • Black, 47.0 ($260.00)
  • Black, 48.0 ($260.00)
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Item # SHI00OO

Why We Like The RX8 Wide Mountain Bike Shoe

Because gravel is still an emerging segment, some riders find themselves struggling with footwear choices—especially for racing. Mountain bike shoes offer great walkability, but are often too heavy and overbuilt. This leads many riders opting for lightweight road shoes with ultra-stiff soles that boost pedaling efficiency, but the lack of tread is not ideal for the inevitable hike-a-bike sections found in gravel race events and adventurous rides. Shimano addresses these problems by combining the best characteristics of their high-end road and mountain footwear into one shoe that's specifically designed for gravel racing. Lightweight and stiff, but with grippy outsoles and just enough toe flex to be comfortable to walk in, the RX8 might just be the best option out there for dedicated gravel enthusiasts. This wide version provides an alternate fit to best suit your feet.

  • Featherweight shoes designed for gravel bike racing
  • Carbon composite sole ensures maximum pedaling efficiency
  • Wide last provides an alternate fit
  • Lugged rubber outsole adds grip for hike-a-bike
  • Reinforced heel cup for stability under hard pedaling
  • Boa dial and toe strap make it easy to get the right fit
  • Perforations in the upper let your feet breathe
  • Wider cleat-to-pedal interface is optimized for XTR M9100 pedals

Tech Specs
Upper Materialsynthetic leather, mesh
ClosureBoa IP1
Footbedhigh-density insole with adaptable arch pads
Sole[sole] carbon fiber composite, [outsole] abrasion-resistant TPU lugs
Cleat Compatibility2-bolt
Manufacturer Warranty1 year


Cycling Footwear
35   4
36 4 5
37 4 5.5
37.5 4.5 6
38 5 6.5
38.5 5.5 7
39 5.5 7
39.5 6 7.5
40 6.5 7.5
40.5 7 8
41 7.5 8.5
41.5 8 9
42 8.5 9.5
42.5 8.5 10
43 9 10.5
43.5 9 11
44 9.5 11
44.5 10  
45 10.5  
45.5 11  
46 11  
46.5 11.5  
47 12  
48 12.5  
49 13  
50 14  

What do you think about this product?


>Rating: 5

Great shoe, inaccurate size chart

I've put it through the wringer
Runs small
Size Bought
6` 3"
180 lbs

Just ordered my 2nd pair of these shoes after 1.5 years on the first pair which are still very useable after extensive use but showing wear on toes. Regarding size chart, I use footwear in the 11.5 to 12.0 range (US). I wear size 46 for my Sidi road shoes and Specialized MTB shoes. No way my foot fits into a 46 for the Shimano RX8. But the 48 is great! Pros: Great comfortable fit (these shoes feel great!), excellent power transfer, feet never fatigue or get too hot (e.g., 90+ degree rides in the Sonoran desert). The shoe is a perfect interface between my foot and the pedal. Cons: On occasion when having to hike my gravel bike through deep, soft sand (like this morning), said sand readily infiltrates through the ventilation holes! I can deal with this (empty the shoe!) better than hot feet! I am a bit disappointed with (what I perceive as premature) wear at the base of the toe but these shoes are not used on a road bike where they would never see a rock!

>Rating: 5

Best gravel shoes!

I've put it through the wringer
True to size
Size Bought
42 Wide
154 lbs

Light and stiff, feel very similar to my road RC9 shoes. I got the wide version and fits very similar to the RC9 wide. These are probably the best gravel shoes for the money!

>Rating: 4

Not as wide as the XC-9

I've put it through the wringer
True to size
Size Bought
5` 8"
145 lbs

As a roadie who switches to SPDs in the winter, I was glad to have this shoe. It is excellent, but something of the magic of the XC-9 has been lost. Most critically, it feels narrower than the XC-9, I have both in the wide version. Perhaps it is just down to materials, the upper on this shoe feels stiffer, but the impression lingers after a full winter in them. So I'm back in my XC-9s again. I hope Shimano gives this shoe the full XC-9 treatment, I would pony up for that!


Will the wide version be available in smaller (women's) sizes? According to Shimano, the wide version goes down to a 38, but Backcountry doesn't offer any wide women's cycling shoes.

>Rating: 4

Beautiful shoe but iffy dial placement

I returned this product before using it
True to size
Size Bought
220 lbs

This is a stunning shoe with first-rate fit and finish. Pulling them out of the box, I was like "Wow!" As far as mountain/gravel shoes go, these couldn't be much more like a true road shoe. They're sleek, light, and with a super-tailored (too tailored?) fit. The stiff carbon sole is exposed on the lateral edges of the sole from front to back. Superb heel fit, even better than the higher-end Sphyre mountain shoes. Which, incidentally, I chose after trying them on back to back with these shoes; here's why: 1. On the Sphyres, Shimano has the boa dial on the strappy thing on top of the shoe, which is unusual, but in my experience is better to prevent feeling the dial on your foot. That's exactly my one and only problem with this RX8 -- The dial placement is really uncomfortable and creates a pressure point on the side of my ankle/foot. Deal breaker. 2. These are definitely more of a glove-like fit than the S-Phyres. More tailored, narrow in comparison. This may make them better for you, but I have big daffy duck feet so wasn't ideal for me. 3. I like how easy the S-Phyres are to get on and off with their dual Boa dials. These, with only one, and again, with the dial on the upper instead of the strap, and exacerbated by the superbly snug heel fit, make putting on and taking off the shoes a challenge. But if they fit your foot, these would make a sweet, sweet pair of kicks for gravel racing, or even race day on the mountain bike.

Same issue for me. Dial placement creates a pressure point.


Do these have the same soles as the non-wide version? Many wides are just extra upper instead of a wider sole.

>Rating: 4

road feel on a MTB pedal

I've used it several times
Runs small
Size Bought
5` 10"
145 lbs

lets start with size, i currently have Giant, Giro, Specialized and Shimano shoes that i rotate for different days. They are all different sizes!!! Specialized - 42.5 Giro - 43.5 Giant - 43 Shimano - 44 (only because they don't sell half sizes) Glad i went with a 44 because the 43 would have been too short but the 44 is a tad long in some real thin socks. Width is nice on the wide version and comparable to a nike shoe. Ride - ride feels great. I use these on a TCX that rides all types of terrain from road to MTB specific trails. I was riding road shoes until i broke a road pedal and decided to switch the set up. These shoes feel right at home when putting down power on the road and feel even better when navigating some technical switchback single track. clips are easy to manage and hike a bike sections dont include profanity trying to walk on a road pedal anymore.