The Surly Disc Trucker models are arguably the most recognisable touring bikes on the planet. Visit almost any popular cycling destination, and you’ll spot a few leaning against café walls or loaded up outside hostels. Scroll through Instagram, and you’ll see them carrying riders across continents. With so many happy users worldwide, there’s little doubt they’re proven machines.
Annnnd now, there’s a fresh update on the 2021 Surly Disc Trucker for us to analyse – the first update in eight years.
I’ve actually used a Surly Trucker to cycle across dozens of countries, covering in excess of 50,000km – so I am very familiar with the bike. In fact, my Trucker was the first touring bike I purchased as a 19-year-old, eager to start exploring the world!
This article will outline all of the changes, and I’ll provide my honest thoughts on the implications of this update.
The 2021 Surly Disc Trucker At A Glance
The 2021 update gets:
- 20-30mm taller frames
- 30mm taller handlebar
- 12mm thru-axles
- 5mm extra tyre clearance
- User-friendly STI shifters
- Additional fork mounting points
- Internal fork dynamo wiring
- TRP Spyre brakes
The 2021 update loses:
- Shimano 3X10 gearing with a Shimano XT derailleur
- Bar-end shifters
- 8mm standover height in smaller frame sizes
- The 11-36t cassette (now 11-34t)
- 36 spoke wheels (now 32)
- The $1550 price (now $1675)
Updated Frame Geometry
The frame has seen a few geometry updates, the most noticeable being an increase in stack height.
Stack height is the vertical distance from the bottom bracket shell to the top of the head tube. On the 2021 Disc Trucker, this has gone up by about 20–30 mm (roughly 1″) across all sizes, which means you’ll need fewer headset spacers to get your handlebars into a comfortable, upright position.
The 2021 Disc Trucker also comes stock with a Surly Truck Stop handlebar that has 30 mm of rise. Combined with the taller stack, this means you’ll need about 5–6 fewer headset spacers — always a welcome simplification.
Since a taller stack can increase frame standover, Surly added more top tube slope on the 700C models to keep standover consistent. That said, the standover has actually increased by roughly 8 mm for the frame sizes most used by smaller riders (42–56 cm), so smaller cyclists should take note.
Surly has also shortened the chainstays by 10 mm, making the bike a touch more agile. While this might not be a major advantage for loaded touring, it does make the bike feel slightly more responsive when riding unloaded.
Other than these tweaks, the frame geometry remains largely unchanged from previous versions.
12mm Thru Axles and Flat Mounts
Surly has followed Kona’s lead by updating the Disc Trucker from quick-release wheels to 12 mm thru-axles and flat-mount disc brake calipers. This setup is now standard on road and gravel bikes, and it looks like it’s becoming the norm for touring bikes as well.
Flat-mount brakes definitely look cleaner, but there is one limitation: you can’t use rotors larger than 160 mm. On a thru-axle bike, a 180 mm front rotor can be a nice upgrade, especially for riders carrying heavier loads of bike, body, and gear.
While 12 mm hubs aren’t yet common in developing countries, hub failures are rare, so this isn’t really a downside. Even if you do have a rim or spoke failure, you can rebuild your existing hubs into a new rim without issue.
A big plus with the new axle standard is that you can run the Shimano UR-705 dynamo hub. This hub has been tested to deliver the most output power at low speeds of any dynamo hub – perfect for lights and charging devices on tour.
The thru-axle design itself is user-friendly too: the Disc Trucker has one open dropout, letting you unscrew the axle a few turns and drop the wheel out without removing the axle completely.
Lots of Fork Luggage Options
The fork now comes with three-pack mounts for cargo cage bags and internal routing for a dynamo cable. You can also attach Surly Porteur racks to the fork crown, giving you plenty of options for carrying luggage up front – from baskets and porteur bags to panniers and cargo cages.
No Kickstand Frame Mounts
Unfortunately, the Disc Trucker still doesn’t come with a dedicated kickstand mount, though it does include an adapter plate to make fitting one possible.
While kickstand mounts are standard on almost every European touring bike, it’s unclear why North American brands often skip them. Personally, I use my kickstand dozens of times a day — for photos, packing, organising gear, or quickly parking the bike.
I don’t mind going without a kickstand on a bikepacking setup, since you can lean the bike on its handlebars. But when you’re carrying panniers, a kickstand becomes essential in my view.
Shimano 9-Speed Brifters
The Disc Trucker used to come with a 3×10 drivetrain, featuring a Shimano XT rear derailleur and bar-end shifters. For 2021, it’s unfortunately been downgraded to Shimano Alivio. To put that in perspective, here’s the Shimano hierarchy from top to bottom: XTR, XT, SLX, Deore, Alivio, Acera, Altus.
Alivio is fine if the goal is integrated, user-friendly shifters — and the Sora-style shifters these days are reliable — but I would have preferred the higher-spec 30-speed bar-end setup. It shifts smoother and, in my experience, handles harsh weather conditions much better.
Another option is to run Shimano 11-speed shifters with a GRX derailleur and a mix of SLX parts. This gives much lower gearing for climbing, though it would likely increase the bike’s price.
Speaking of climbing gears, the lowest gear on the Disc Trucker is 19.7″ with the 26″ wheels and 20.9″ with the 700C wheels. For touring, we usually aim for 20″ or less. If the stock gearing feels a bit tall, you can swap the front chainrings or upgrade the cassette to a 36-tooth cog – something that arguably should have been standard from the factory.
26″ and 700C Wheels
The rims on the new Disc Trucker now have an internal width of 21mm, which is 3mm wider than before. That makes them perfectly suited for 40–50mm touring tyres, and they’re tubeless-ready too.
On the downside, the wheels appear to have 32 spokes now (the photos show this, although the spec sheet still claims 36). This makes them a touch less burly than before, but in practice, the Alex Adventurer rims are solid enough that I wouldn’t call this a dealbreaker.
Surly continues to offer 26″ wheels on the smaller frame sizes – 42cm up to 56cm. While 26″ is often marketed as ideal for developing countries, my experience in Latin America shows that 27.5″ and 29″ wheels are much more common, especially on entry-level mountain bikes. High-quality 26″ tyres and rims exist, but finding them can be tricky – in one trip, we came back empty-handed looking for a good 26″ tyre.
For the 56cm frame, you can choose between two wheel sizes, then from 58cm to 64cm, you’re on 700C wheels. With fenders, the max tyre clearance is 26×2.1″ and 700C×47mm – a bit less than what you get on bikes like the Salsa Marrakesh or Kona Sutra.
One thing Surly still does extremely well is frame sizing. They offer 10 sizes, far more than the typical 4 to 6 sizes most brands provide. That means the 42cm frame is one of the smallest touring bikes available, while the 64cm frame now accommodates riders over 2 metres tall, making it one of the largest touring bikes on the market.
The 2021 Disc Trucker comes with TRP Spyre cable disc brakes, which are among the best cable-actuated brakes available. These are unique because they pull both brake pads simultaneously, giving more consistent stopping power than typical cable discs.
Other highlights include Surly ExtraTerrestrial tyres and a high-quality sealed-bearing Cane Creek headset.
The bike is priced at US $1,675, which puts it in line with similarly equipped touring bikes like the Salsa Marrakesh and Trek 520, though it’s a couple of hundred dollars higher than the Kona Sutra.
If you prefer to do your own build, the frameset alone is available for US $725.
The 2021 Surly Disc Trucker Summary
The 2021 update gets:
- 20-30mm taller frames
- 30mm taller handlebars
- 12mm thru-axles
- 5mm extra tyre clearance
- User-friendly STI shifters
- Additional fork mounting points
- TRP Spyre brakes
The 2021 update loses:
- Shimano 3X10 gearing with a Shimano XT derailleur
- Bar-end shifters
- 8mm standover height in smaller frame sizes
- The 11-36t cassette (now 11-34t)
- The $1550 price (now $1675)
My Honest Thoughts
The 2021 Surly Disc Trucker keeps the strong points we’ve always loved: the frame geometry is solid, it comes in a very wide size range, and the taller stack height now makes it much more comfortable for touring. The move to 12mm thru-axles also future-proofs the bike and allows it to pair nicely with the Shimano UR-705 dynamo hub.
That said, I think 27.5″ wheels might have been the smarter choice for the smaller frame sizes.
The Shimano Sora shifters are very reliable, but I prefer the previous 3×10 drivetrain for its performance at this price point. I understand why Surly opted for a lower-spec drivetrain with integrated shifters—they are user-friendly—but a 36-tooth rear cog should really have been carried over from the previous model.
The frame’s lateral stiffness has never been its strongest suit, so I would have liked larger-diameter steel tubes up front. A rear KSA-18 kickstand mount would have been very welcome, and a touch more tyre clearance with fenders would allow my favourite slick touring tyre, the 700c x 50mm Schwalbe Almotion, to fit comfortably.
All in all, the 2021 Disc Trucker is a great touring bike, and with its reputation, it will remain popular. That said, with a little more tyre clearance, a higher-spec drivetrain, and a slightly lower price, the Kona Sutra still edges it out as my top pick in this category.
Want To Compare The Surly Disc Trucker With Dozens of Others?
Check out The Touring Bicycle Buyer’s Guide, which compares touring bike steering, sizing, gear ratios, specifications, pricing and more. The Bikepacking Bike Buyer’s Guide does the same thing, however, with a focus on lighter bikes and models with more off-road capability. Both of these guides are updated annually with the latest models at no extra cost!
Helpful Resources
All About Touring Bike Brakes
Frame Materials for Bicycle Touring
How to Select Touring Bike Gearing
Understand Bicycle Frame Geometry
What’s the Difference between Cyclocross and Touring Bikes?
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