Mongoose Guide Expert review

An adventure bike built around fun, not speed

Our rating 
4.0 out of 5 star rating 4.0

Our review

Long, tall and stable, Mongoose's Guide Expert is what an adventure road bike should be
Buy if, Speed doesn't matter and your adventure riding is more about the journey than anything else
Pros: Fun to ride; long, stable geometry; great bag; good price
Cons: Heavy; tall front end; needs more gear range; one bottle mount in frame; no clutch on rear derailleur; only three beers fit in bag
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Gravel bikes vary greatly, from light, stiff, carbon race machines to braze-on-equipped, long-wheelbase, steel touring rigs. Mongoose’s Guide Expert leans heavily towards the ‘let’s pack up some gear and pedal into no man’s zone’ type of gravel riding. It is a fun bike and one that surprised me more than any test bike I have ridden in some time.

This is why I suggest a lower gear range for a bike like the Guide Expert
Russell Eich / Immediate Media

Mongoose Guide Expert specs

  • Tectonic T2 aluminum frame
  • 29 x 1.75in tires
  • Stash Pack frame bag
  • 11-speed Shimano 105; 48/32 and 11-32t
  • Internal cable routing
  • Shimano hydraulic disc brakes
  • Sizes: 52, 54, 56, 58cm (tested)
  • Actual weight: 11.37kg / 25.1lb

Needs a clutch and more gearing

As is the norm, the Shimano 105 drivetrain shifted smoothly, but did bang and clack around since the rear derailleur was devoid of a clutch. And despite having a double chainring up front, the gear range was too tall in my opinion for the bike’s intended purpose.

A bike like this doesn’t need high-end speed, it requires low-end, hill-climbing grunt of something lower than a 32/32. Trail bikes these days often come with 32 x 10-50 (SRAM) or 30 x 11-46 (Shimano); this isn’t a trail bike, but it does want to explore steep trails, and I was often wishing for something lower.

The Shimano hydraulic brakes were excellent with fine modulation, good consistency, and zero maintenance throughout the test. They also spin rub- and squawk-free, which was much appreciated.  

My adventures lead to many old mining shacks and forgotten zones
Russell Eich / Immediate Media

I found the saddle to be too wide, especially through the nose. If it were my bike I’d swap out the bar tape for something softer and tackier as well. 

I grew to adore the included frame bag. It’s cavernous enough for a real pump, tube, levers, multi-tool, snacks, keys, phone, and light windbreaker. Or just a couple of beers. 

 But because of the bag there’s only one bottle mount inside the frame, which was a drag. That said, there are attachments on the carbon fork. 

A laid-back ride

Sometimes you can tell how a bike is going to ride just by looking at it; other times it’s a shock. The Guide Expert isn’t fooling anyone. It looks long and tall because it is. 

To stretch out the wheelbase, the chainstays are vast and the head tube ratchets skyward as frame sizes increase. The distinctive top tube kink adds visual height to the tall front end as well. 

Even with the relatively large tires, there’s a ton of room still between the chainstays
Russell Eich / Immediate Media

So how does it ride? Surprisingly well. I’ve been on a few very different gravel bikes this season, ranging from the silky smooth, titanium Why Cycles R+ beauty, to the let’s-rip-some-legs-off, carbon Scott Addict Gravel 10 race bike, as well as the very confident Norco Search XR (full review in the works). 

The Mongoose is different than all of those. Its ride is relaxed, yet confident. Its 406.3mm reach is about the same as the 58mm Addict Gravel’s 405mm and 60.5cm Search XR’s 407mm, but the stack is much higher (630.1 vs. 602.2 vs. 620mm), so the riding position is much more upright. 

Adding to the upright confidence is the super-long rear end. Again, compared to the racing Addict Gravel, the Guide Expert tacks on an extra 38mm (460 vs. 422mm) on the chainstays. Norco’s Search XR has 425mm stays. 

But it makes the ride so luxurious. Its Cadillac-esque wheelbase lets the bike cruise with a reassured confidence. 

It’s not stiff either. The bottom bracket sways when you load the pedals, and the WTB i19 rims aren’t going to be a sprinter’s first choice. Still, it put a smile on my face and surprised me more than any bike I’ve recently tested. 

It can certainly handle the tarmac, but its home turf is decidedly gravel and dirt roads
Russell Eich / Immediate Media

In a gigantic contrast to most bikes, the Guide Expert isn’t fast, and it seems 100 percent okay with that. It’s almost as if it begged me to slow down, to take it easy, and to look around a bit more. For me, that alone, makes the Guide Expert an exceptional bike.

Mongoose Guide Expert bottom line

The Guide Expert made me want to grow my beard out and cut off my jeans into some sweet jorts. I had visions of downsizing my life, of spending more time in the woods and moving about life at a slower pace. That’s this bike’s vibe. 

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It’s not fast, but it’s not meant to be. It’s not light, but that’s not surprising. What it is, is reliable, fun to ride, and ready to rattle and bump around forgotten roads. 

Product Specifications


Name Name, 0, 10, Name, Guide Expert
Brand Brand, 0, 20, Brand, Mongoose

Bottom Bracket Bottom Bracket, 2, 0, Bottom Bracket, FSA BB-EVO8681
Brakes Brakes, 2, 0, Brakes, Shimano BR-RS805 flat-mount disc brakes
Cassette Cassette, 2, 0, Cassette, Sunrace 11-32T 11-speed
Chain Chain, 2, 0, Chain, KMC X11
Cranks Cranks, 2, 0, Cranks, FSA Gossamer 48/32
Fork Fork, 2, 0, Fork, Carbon
Frame Material Frame Material, 2, 0, Frame Material, Tektonic T2 aluminum
Front Derailleur Front Derailleur, 2, 0, Front Derailleur, Shimano 105 5800
Front Hub Front Hub, 2, 0, Front Hub, Xposure 12 mm thru axle
Front Tyre Front Tyre, 2, 0, Front Tyre, Kenda Slant Six 29 x 1.75in
Handlebar Handlebar, 2, 0, Handlebar, Xposure drop bar 31.8
Rear Derailleur Rear Derailleur, 2, 0, Rear Derailleur, Shimano 105 5800
Rear Tyre Rear Tyre, 2, 0, Rear Tyre, Kenda Slant Six 29 x 1.75in
Rims Rims, 2, 0, Rims, WTB STP i19
Saddle Saddle, 2, 0, Saddle, Mongoose Adventure
Seatpost Seatpost, 2, 0, Seatpost, Xposure alloy
Shifters Shifters, 2, 0, Shifters, Shimano ST-R685
Stem Stem, 2, 0, Stem, Xposure 3D forged
Brake Levers Brake Levers, 2, 0, Brake Levers, Shimano ST-R685