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It's right for you if...

You're ready to try your hand at mountain biking to see if you fall in love, and want a bike you can ride wherever you choose. You plan to ride all types of terrain, from city streets to gravel paths and light singletrack.

The tech you get

820 has a strong steel frame, a reliable 21-speed Shimano drivetrain, semi-slick tires that roll well on pavement and trails, durable alloy wheels, and a suspension fork that takes the edge off bumps. Plus, it has mounts so you can accessorize with racks, fenders, lights, and more.

The final word

820 is a great bike for anyone testing the waters of off-road riding. It's versatile, durable, and works well on rough pavement, light trails, or both.

The Walkthrough

favorite_borderWhy you'll love it

  1. 820 is a great bike at an even better price, and it lets you explore off-road riding without the giant price tag that comes with higher-end mountain bikes
  2. The high-volume mountain bike tires and suspension fork take the edge off rough roads and trails
  3. Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter

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*spec applies to all sizes unless otherwise noted

Frame Trek Custom Steel, rack mounts, 135x5mm QR
Fork SR Suntour M-3030, coil spring, 100x5mm QR, 75mm travel
Max compatible fork travel 75mm
Hub front Formula FM21 alloy, 100x5mm QR
Hub rear Formula FM31 alloy, 7sp freewheel, 135x5mm QR
Rim Bontrager AT-550, alloy, 36-hole, schrader valve
Max tire size 26x2.00"
Shifter Shimano Tourney EF41, 7 speed
Front derailleur Shimano Tourney TY500, 31.8mm clamp, top swing, dual pull
Rear derailleur Shimano Tourney TY300, long cage, 34T max cog
Crank Shimano Tourney TY301, 42/34/24, 170mm length
Cassette Shimano TZ500, 14-28, 7 speed
Chain KMC Z7, 7 speed
Pedal VP-536 nylon platform
Saddle Bontrager Sport
*Seatpost Size: XS, S
Bontrager alloy, 29.2mm, 12mm offset, 300mm length
Size: M/L, L
Bontrager alloy, 29.2mm, 12mm offset, 330mm length
Size: XL
Bontrager alloy, 29.2mm, 12mm offset, 400mm length
*Handlebar Size: XS, S
Bontrager alloy, 31.8mm, 15mm rise, 660mm width
Size: M/L, L, XL
Bontrager alloy, 31.8mm, 15mm rise, 690mm width
Grips Bontrager SSR
*Stem Size: XS
Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 60mm length
Size: S
Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 80mm length
Size: M/L, L
Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 90mm length
Size: XL
Bontrager alloy, 31.8mm clamp, Blendr compatible, 7 degree, 100mm length
Headset 1-1/8'' threadless
Brake Tektro alloy linear-pull
Weight ML - 15.28 kg / 33.68 lbs (with tubes)
Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.


Rider Height


All measurements provided in cm unless otherwise noted.

Frame size number Frame size letter Wheel size A — Seat tube B — Seat tube angle C — Head tube length D — Head angle E — Effective top tube F — Bottom bracket height G — Bottom bracket drop H — Chainstay length I — Offset J — Trail K — Wheelbase L — Standover
13 in XS 26" 33.0 74.0° 11.0 70.5° 52.4 28.7 0.0 43.0 4.0 7.6 101.9 70.5
16 in S 26" 40.6 73.5° 11.0 70.5° 55.0 29.1 0.0 43.0 4.0 7.6 104.0 73.8
18 in ML 26" 45.7 73.5° 13.0 70.5° 56.5 29.3 0.0 43.0 4.0 7.6 105.7 77.2
19.5 in L 26" 49.5 73.0° 15.0 70.5° 58.0 29.3 0.0 43.0 4.0 7.6 106.8 79.9
21 in XL 26" 53.3 73.0° 17.0 70.5° 59.0 29.3 0.0 43.0 4.0 7.6 107.9 82.7
22.5 XXL 26" 57.2 72.5° 19 70.5° 60.0 29.5 0.0 43.0 4.0 7.6 108.4 85.7

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