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It's right for you if...
You're a value-minded rider looking for a lightweight race bike with the added versatility and performance of disc brakes. You expect a lot of performance for your dollar, and want a quality ride you won't immediately outgrow.
The tech you get
A lightweight 300 Series Alpha Aluminum frame with shaped tubes and Invisible Weld Technology for the looks and handling of a far more expensive carbon bike, a Shimano Tiagra groupset with 20 speeds, an Émonda carbon fork, powerful flat-mount hydraulic disc brakes, and internal cable routing in both the frame and fork.
The final word
Émonda ALR 4 Disc is the most affordable road disc model in the lineup, but it handles like a far more expensive bike and has the looks to match. It's an extremely capable race bike at a great value.
The Walkthrough
favorite_borderWhy you'll love it
- Carbon looks and handling, alloy price point: Invisible Weld Technology and shaped tubes for sleek looks, light weight, and incredible handling
- It climbs fast, corners on rails, and descends with confidence
- Disc brakes offer better braking performance and extra clearance for wider, more stable tires
- It shares the geometry of our highest-end carbon Émonda race bikes, and it gives you a ride quality that stands up in every way to far more expensive carbon bikes
- Internal cable routing extends the life of your cables and adds to the bike's sleek look
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Features
300 Series Alpha Aluminum
Trek’s premium-grade aluminum is hydroformed into size-specific tubes that provide the perfect balance of stiffness and weight.
Learn more
H2 fit
H2 is the optimal fit to put most riders, including many of our Pro Team athletes, in the right position for power and performance.
Invisible weld technology
Revolutionary welding technology creates a better connection with each tube junction, increasing strength while using less material.
Flat Mount disc brakes
All-new Flat Mount disc brakes are more elegant, lighter, smaller, and cleaner than traditional disc brakes, providing superior performance and stopping power under harsh conditions.
Blendr-compatible stem
Bontrager Blendr stem technology lets you clip your gear directly to the stem for clean looks, maximum user friendliness.
Learn more
Specifications
*spec applies to all sizes unless otherwise noted
| Frame | Ultralight 300 Series Alpha Aluminum, Invisible Weld technology, tapered head tube, Control Freak internal routing, DuoTrap S compatible, flat mount disc, 142x12mm thru axle |
|---|---|
| Fork | Emonda SL full carbon, tapered carbon steerer, internal brake routing, flat mount disc, 12x100mm thru axle |
| Front hub | Bontrager alloy, sealed bearing, centerlock disc, 100x12mm thru axle |
|---|---|
| Rear hub | Bontrager alloy, sealed bearing, centerlock, Shimano 11-speed freehub, 142x12mm thru axle |
| Rim | Bontrager Affinity Disc, Tubeless Ready, 24-hole, 21mm width, presta valve |
| Spokes | 14g stainless steel |
| Tire | Bontrager R1 Hard-Case Lite, wire bead, 60 tpi, 700x25c |
| Shifter | Shimano Tiagra R4725, short reach lever, 10 speed |
|---|---|
| Front derailleur | Shimano Tiagra 4700, braze-on |
| Rear derailleur | Shimano Tiagra 4700, long cage, 34T max cog |
| *Crank |
Size:
47, 50, 52 Shimano Tiagra 4700, 50/34, 170mm length |
|
Size:
54, 56 Shimano Tiagra 4700, 50/34, 172.5mm length |
|
|
Size:
58, 60, 62, 64 Shimano Tiagra 4700, 50/34, 175mm length |
|
| Bottom bracket | Shimano BB71, 86.5mm, PressFit |
| Cassette | Shimano Tiagra HG500, 12-28, 10 speed |
| Chain | Shimano Tiagra HG54, 10 speed |
| Saddle | Bontrager Montrose Comp, steel rails, 138mm width |
|---|---|
| *Seatpost |
Size:
47 Bontrager Comp, 6061 alloy, 27.2mm, 8mm offset, 250mm length |
|
Size:
50, 52, 54, 56, 58, 60, 62, 64 Bontrager Comp, 6061 alloy, 27.2mm, 8mm offset, 330mm length |
|
| *Handlebar |
Size:
47 Bontrager Comp VR-C, alloy, 31.8mm, 100mm reach, 124mm drop, 38cm width |
|
Size:
50, 52 Bontrager Comp VR-C, alloy, 31.8mm, 100mm reach, 124mm drop, 40cm width |
|
|
Size:
54, 56 Bontrager Comp VR-C, alloy, 31.8mm, 100mm reach, 124mm drop, 42cm width |
|
|
Size:
58, 60, 62, 64 Bontrager Comp VR-C, alloy, 31.8mm, 100mm reach, 124mm drop, 44cm width |
|
| Handlebar tape | Bontrager Supertack Perf tape |
| *Stem |
Size:
47 Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 70mm length |
|
Size:
50 Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 80mm length |
|
|
Size:
52, 54 Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 90mm length |
|
|
Size:
56, 58 Bontrager Elite, 31.8mm clamp, Blendr compatible, 7 degree, 100mm length |
|
|
Size:
60, 62 Bontrager Elite, 31.8mm clamp, Blendr compatible, 7 degree, 110mm length |
|
|
Size:
64 Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 120mm length |
|
| Headset | FSA Integrated, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom |
| Brake | Shimano Tiagra hydraulic disc, flat mount |
| Brake rotor | Shimano SM-RT70, 160mm, Centerlock |
| Weight | 56 - 9.40 kg / 20.73 lbs |
|---|---|
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 275 pounds (125 kg). |
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
Inseam
47
152.0 - 158.0 cm
4'11.8" - 5'2.2"
71.0 - 75.0 cm
28.0" - 29.5"
50
158.0 - 163.0 cm
5'2.2" - 5'4.2"
74.0 - 77.0 cm
29.1" - 30.3"
52
163.0 - 168.0 cm
5'4.2" - 5'6.1"
76.0 - 79.0 cm
29.9" - 31.1"
54
168.0 - 174.0 cm
5'6.1" - 5'8.5"
78.0 - 82.0 cm
30.7" - 32.3"
56
174.0 - 180.0 cm
5'8.5" - 5'10.9"
81.0 - 85.0 cm
31.9" - 33.5"
58
180.0 - 185.0 cm
5'10.9" - 6'0.8"
84.0 - 87.0 cm
33.1" - 34.3"
60
185.0 - 190.0 cm
6'0.8" - 6'2.8"
86.0 - 90.0 cm
33.9" - 35.4"
62
190.0 - 195.0 cm
6'2.8" - 6'4.8"
89.0 - 92.0 cm
35.0" - 36.2"
64
195.0 - 200.0 cm
6'4.8" - 6'6.7"
91.0 - 94.0 cm
35.8" - 37.0"
All measurements provided in cm unless otherwise noted.
| Frame size number | Wheel size | A — Seat tube | B — Seat tube angle | C — Head tube length | D — Head angle | E — Effective top tube | G — Bottom bracket drop | H — Chainstay length | I — Offset | J — Trail | K — Wheelbase | L — Standover | M — Frame reach | N — Frame stack |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 47 cm | 700c | 42.4 | 74.6° | 11.5 | 71.2° | 51.3 | 7.2 | 41 | 4.5 | 6.7 | 97.4 | 69.8 | 36.9 | 52.2 |
| 50 cm | 700c | 45.6 | 74.6° | 13 | 72.1° | 52.1 | 7.2 | 41 | 4.5 | 6.1 | 97.4 | 70.7 | 37.4 | 53.5 |
| 52 cm | 700c | 47.3 | 74.2° | 14 | 72.8° | 53.4 | 7.2 | 41 | 4.5 | 5.7 | 97.7 | 72.9 | 37.9 | 54.7 |
| 54 cm | 700c | 48.6 | 73.7° | 15.5 | 73.0° | 54.3 | 7 | 41 | 4.5 | 5.6 | 98.1 | 74.2 | 38.1 | 55.5 |
| 56 cm | 700c | 51.3 | 73.3° | 17 | 73.5° | 56 | 7 | 41 | 4 | 5.8 | 98.3 | 76.7 | 38.7 | 57.7 |
| 58 cm | 700c | 53.3 | 73.0° | 19 | 73.8° | 57.3 | 6.8 | 41.1 | 4 | 5.6 | 99.2 | 78.6 | 39.1 | 59.6 |
| 60 cm | 700c | 55.3 | 72.8° | 21 | 73.9° | 58.6 | 6.8 | 41.1 | 4 | 5.6 | 100.1 | 80.4 | 39.5 | 61.5 |
| 62 cm | 700c | 57.3 | 72.5° | 23 | 73.9° | 59.8 | 6.8 | 41.2 | 4 | 5.5 | 101 | 82.2 | 39.8 | 63.4 |
| 64 cm | 700c | 59.3 | 72.3° | 25 | 74.0° | 61 | 6.8 | 41.3 | 4 | 5.5 | 101.8 | 84.1 | 40.1 | 65.4 |