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Crankbrothers Stamp Boa- Unisex Review

Boa lacing and a fairly comfortable fit make this shoe attractive, however, flex at the midfoot and poor contact between the sole and our non-Crankbrothers pedals detract from the shoe’s positive qualities
Crankbrothers Stamp Boa- Unisex
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Price:  $180 List | Check Price at Backcountry
Compare prices at 2 resellers
Pros:  Quick adjustments with Boa Lacing, no heel lift, excellent trail absorption
Cons:  Hard to maintain contact between sole and pedal, flex in the shoe at mesh side panels
Manufacturer:   Crankbrothers
By Tara Reddinger-Adams ⋅ Review Editor  ⋅  Apr 26, 2021
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65
OVERALL
SCORE


RANKED
#7 of 10
  • Grip - 30% 5
  • Comfort and Protection - 25% 8
  • Rigidity and Power Transfer - 20% 6
  • Breathability - 10% 7
  • Durability - 10% 7
  • Weight - 5% 8

Our Verdict

We were excited to see Boa lacing employed on the Crankbrothers Stamp Boa shoe. You can quickly and easily dial in the fit to your foot, and paired with silicone grippers in the heel creates a great fit and power transfer on the flats. Mesh side panels provide good ventilation, but also flex and bunch up on the foot resulting in an odd feel, and the soles showed more wear than other shoes tested in a similar timeframe. Poor connection between the shoe's sole and our Chromag pedals results in too many slipped pedals, especially on technical climbs, and makes us question wearing these on truly technical terrain.

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Star Rating
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Pros Quick adjustments with Boa Lacing, no heel lift, excellent trail absorptionLightweight, fantastic grip, great power transfer, durableExcellent grip, comfortable, lightweight, breathable, reasonable priceExcellent grip, Lots of foot protection, durabilityInexpensive, offers a lot of protection, balanced grip
Cons Hard to maintain contact between sole and pedal, flex in the shoe at mesh side panelsBreathability is not the best in hot conditionsLong laces, minimal foot protectionBulky and heavy, poor ventilation, not the best choice for trail ridingNot the grippiest, moderate weight
Bottom Line Boa lacing and a fairly comfortable fit make this shoe attractive, however, flex at the midfoot and poor contact between the sole and our non-Crankbrothers pedals detract from the shoe’s positive qualitiesA great performing all-round shoe with great power transfer and the right mix of stiffness, flex, and comfortAn excellent performing shoe for all types of flat pedal riders that has outstanding grip, comfort, and valueThese are great for a downhill-specific rider, as they provide tons of foot protection and tenacious gripThis is an exceptional flat pedal shoe for someone just starting their mountain bike adventures, especially for the price
Rating Categories Crankbrothers Stamp... Five Ten Freerider Pro Specialized 2FO Roo... Five Ten Impact Pro... Ride Concepts Livewire
Grip (30%)
5.0
10.0
10.0
10.0
8.0
Comfort And Protection (25%)
8.0
8.0
7.0
9.0
9.0
Rigidity And Power Transfer (20%)
6.0
8.0
8.0
9.0
7.0
Breathability (10%)
7.0
7.0
8.0
3.0
6.0
Durability (10%)
7.0
9.0
9.0
9.0
8.0
Weight (5%)
8.0
10.0
8.0
3.0
6.0
Specs Crankbrothers Stamp... Five Ten Freerider Pro Specialized 2FO Roo... Five Ten Impact Pro... Ride Concepts Livewire
Outsole Match MC2 Stealth S1 SlipNot™ ST Stealth S1 Rubber Kinetics DST6.0 High Grip
Tread Pattern Match Full Hexagon Dot Full Hexagon Dot Full Dot Full Haxagon Dot
Measured Weight Grams (pair) 667 g 616 g 669 g 986 g 754 g
Upper Material PU/Synthetic Synthetic Leather, Suede Synthetic Synthetic, mesh
Footbed not specified Ortholite Body Geometry Ortholite D30 High Impact Zone
Sole Rubber/EVA/Nylon EVA EVA EVA EVA
Size Tested US 7(Unisex) 8 EU 40 8.5 9

Our Analysis and Test Results

Crankbrothers entered the mountain bike shoe market in 2021 with the introduction of their Stamp and Mallet shoes. The Stamp Flat line of shoes features three different versions of the same shoe: Stamp Lace, Stamp Speed Lace, and the Stamp Boa (tested). The Stamp Boa features a Boa lacing system, mesh panels for breathability, and Match Compound MC2 on the soles with a tread pattern optimized for the Crankbrothers Stamp pedal. Despite being optimized for their Stamp pedals, Crankbrothers states the sole is "is designed to work flawlessly with any flat pedal."

The Boa lacing system worked flawlessly, and our testers enjoyed the ability to make on-the-fly adjustments, especially on long rides. We were also impressed by the shoes' heel cup and silicone heel dots which kept our heels in place even on steep and technical out-of-saddle climbs. The shoe has excellent midsole absorption, which smooths out the terrain and dampens trail vibrations. However, our testers use Chromag Scarab pedals and had difficulty maintaining a connection between the shoes' sole and the pedal, despite trying different fork settings and foot techniques. Our foot frequently bounced and slipped off the pedal both on technical climbs and descents, leaving us frustrated and underwhelmed. In reading other reviews of the shoe, we found other testers to experience similar issues with other pedal brands.

Performance Comparison


We love the Boa lacing but are frustrated by the lack of grip on our...
We love the Boa lacing but are frustrated by the lack of grip on our pedals.
Photo: Byron Adams

Grip


Crankbrothers has designed their shoes to work optimally with their pedals, and the Stamp is made to work with the Stamp pedals which are available in both small and large sizes. The sole is Match Compound MC2 and the sole's tread pattern matches that of their pedal's pin placement. During our testing, we found the Match Compound sole is not as grippy or sticky as other shoes we tested. We had difficulty with the interface between our Chromag Scarab pedals and the shoe's sole resulting in our feet bouncing and slipping on the pedal, especially on technical terrain.

We wore two different shoes on more than one occasion and tried to...
We wore two different shoes on more than one occasion and tried to reduce variables such as fatigue, terrain, fork and shock pressure as much as possible to decipher the differences in grip.
Photo: Tara Reddinger-Adams

Crankbrothers states that the shoes' sole is designed to work with any flat pedal, and after experiencing pedal slips on numerous rides, we decided to ride with different shoes on each foot to see if we had the same experience with other brands. When we tried this test, the Stamp shoe slipped much more on the pedal compared to other brands. We also tried a 360 pedal rotation test, going toe down heel down, and found it more difficult to maintain contact with the Chromag pedals during this test as well. On hike-a-bikes we found the sole traction to be so-so, especially on sand-covered slick rock where we had more slipping compared to other shoes tested.

You can see how the soles tread pattern mimics the Stamp pedal.
You can see how the soles tread pattern mimics the Stamp pedal.
Photo: Byron Adams

Riders using Crankbrothers pedals may have a different experience with the shoes' grip, however, those using other pedal brands may want to look at other options.

Comfort and Protection


The Stamp Boa uses a Boa lacing system that works flawlessly and allows for quick adjustments and we appreciate not having to tuck away laces into elastic bands. We were able to coast with our foot in the noon position and make micro-adjustments to the shoes fit on rides and a large velcro strap helps to keep things nice and snug, providing a good fit.

The eyelets of the laces are nicely tucked away under the shoes...
The eyelets of the laces are nicely tucked away under the shoes uppers.
Photo: Byron Adams

Like many of the newer shoe models we tested, we would call the shoes fit medium, neither voluminous nor narrow. Our tester wears an 8.5 women's shoe and has a slightly wide forefoot. Using Crankbrothers sizing chart, an 8.5 women's equates to a EU39.5/US7 which fit comfortably, with no extra slop. Those with extra wide feet may find the toe box a tad narrow.

A highly padded tongue and heel and a TPU reinforced toe box offer enough protection from the trail for most riding, and would even provide enough protection for enduro racing, but we would want a little more protection for true downhill riding. The TPU reinforced toe box provides ample protection from rock strikes. While we appreciate the highly padded tongue, especially with the Boa lacing, we did find it hit the front of our ankle. While this was not uncomfortable, it was noticeable.

The mesh panels on the midfoot tend to bunch and flex over the course of a ride, especially as the shoes broke in, to the point of being visually noticeable to other riders. This may be due to our foot shape and volume and those with a wider midfoot or larger volume foot may not experience this bunching.

Here you can see how differently sized the left and right insoles...
Here you can see how differently sized the left and right insoles are. The left insole is significantly longer and bunches at the toe, while the right is short and leaves a gap between the sole and toebox.
Photo: Tara Reddinger-Adams

One issue our shoes have is different sized footbeds with over a 3/4" difference between left and right. The right insole is 9.5" long and the left insole is 10 3/8" long. The left insole is too long causing it to bunch up in the toe box and the right too short leaving a 1/4" gap at the toe. Over time the bunching in the left became less noticeable, but we expect the insole to be appropriately cut for the shoes' size. We assume this was just a quality control oversight, but feel it is notable nonetheless.

Rigidity and Power Transfer


The Stamp Boa does a great job at keeping the heel in place, especially on climbs. The combination of the velcro strap and heel cup with silicone dots prevents heel lift. Our testers prefer a shoe that absorbs bumps from the trail, as our feet have become uncomfortably sore in the past from flexy shoes. The Stamp's midsole and shank are stiff and absorb trail vibrations very, very well, which is very evident on loose, chunky descents and one of the shoe's best features.

This shoe did best on flat terrain for power transfer.
This shoe did best on flat terrain for power transfer.
Photo: Byron Adams

On flat terrain, the shoe's stiffness is noticeable, making it easy to push into the pedals for efficient power transfer. However, on technical terrain, it became hard to separate the shoes' stiffness and power transfer from the sole's grip because of the difficulty we experienced maintaining a connection to the pedal. Again, those using Crankbrothers pedals may have a different experience with this.

Breathability


Many flat pedal shoes do not breathe incredibly well, in part due to their design and construction. Overall, we were pleased to find that the Stamp Boa breathes relatively well thanks to a perforated tongue and mesh panels just behind the toes and midfoot. These panels allow adequate airflow into the foot, and our feet never felt overly hot or sweaty.

The mesh side panel provides good breathability but also flexes...
The mesh side panel provides good breathability but also flexes while pedaling.
Photo: Byron Adams

We did notice, as did our friends, that the mesh side panels flex quite a bit on the pedal and become misshapen while riding. This creates a gap between the rider's foot and the shoe, which is slightly annoying, but not uncomfortable.

Durability


The synthetic upper, TPU reinforced toebox, and MC2 rubber soles held up very well during our testing, which occurred mostly in sandy and rocky desert conditions. The shoe's Boa lace eyelets are tucked away behind the uppers which adds a layer of protection to the laces. Dirt and mud cake on the shoe's uppers without creeping into the inside the shoe.

Here you can see some rubber missing from our pins. We question the...
Here you can see some rubber missing from our pins. We question the durability because of how many smaller pieces are coming loose on the left sole.
Photo: Tara Reddinger-Adams

Despite not being waterproof, the Stamp does a great job at keeping the foot dry. The Boa, velcro, and padded tongue create a snug fit, which repels dirt and moisture. Even in the rain, our feet stayed relatively dry and the shoes were dry the next day, even with being in a below-freezing garage overnight.

The Stamp's soles remain relatively free of pin scars after our testing, however, on the left sole, there are a few small chunks of rubber missing. This makes us question how well the shoe's soles will hold up over a season of heavy use.

Weight


The Stamp Boa weighs 667-grams for a size EU39.5/US7, which is in line with many other shoes that we have tested with comparable protection.

A relatively light shoe given the amount of protection it offers.
A relatively light shoe given the amount of protection it offers.
Photo: Tara Reddinger-Adams

Value


The Crankbrothers Stamp Boa is the most expensive flat shoe in our testing, which one may expect because of the Boa lacing system. However, the pedal interface with non-Crankbrothers pedals is less than stellar during our testing and we have some concerns about the quality of the shoes due to different sized footbeds and pin scars. Overall, we feel there are better options available which also happen to have lower price points.

Conclusion


The Stamp Boa some great qualities, excellent trail absorption, a stiff shank, Boa lacing, and it does a great job of keeping moisture and dirt out of your shoes. However, our testers had problems with the sole interfacing with our Chromag pedals which caused our foot to slip and bounce on the pedal. The Stamp is optimized to interface best with the Crankbrothers Stamp pedal, and we suggest looking at how your pedals line up with the sole of your shoes before making a purchase decision if you don't use CrankBrothers pedals.

Chromag Scarabs are not the best fit with the tread pattern of the...
Chromag Scarabs are not the best fit with the tread pattern of the shoe.
Photo: Byron Adams

Tara Reddinger-Adams