The DTTZH F6 is a moped-style fat tire e-bike with one feature that sets it apart on Amazon: you unlock it with an NFC card or a 4-digit password instead of a key. It also has a color display, dual suspension, 20″ x 4″ tires and stated UL 2849 certification. The tricky part is that “F6” is a family of bikes (F6, F6S and F6 Pro), and the Amazon listing (ASIN B0FR3HHTP6) mixes all three into one title. This review untangles which specs belong to which bike, so you know what you’re actually ordering.
How we research: We did not physically test this bike. This review is based on the live Amazon US listing (checked November 2026) and the manufacturer’s published specifications. Range figures are our own estimates from battery capacity, not measurements. Read our research method.
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Quick Verdict
The base DTTZH F6 is a well-equipped choice for riders who want an easy, comfortable moped-style e-bike for town and light off-road riding, with modern touches like keyless unlock and a color screen. DTTZH’s own spec sheet lists 60 Nm of torque, a 48V 15Ah (720 Wh) battery, mechanical disc brakes, a 330 lb (150 kg) maximum load and a weight of 34 kg (about 75 lbs). Its stated UL 2849 certification covers the whole electrical system, which many apartment buildings now ask for.
The downsides: it’s heavy, the base model has mechanical brakes, and the bigger F6S and F6 Pro versions on the same listing are much faster than US e-bike rules allow. Pick your option carefully.
F6 vs F6S vs F6 Pro: Which One Is on the Listing?
The Amazon page offers several options: 48V 15.6Ah (black or red), 48V 25Ah (black or red) and 60V 30Ah (black), each with or without a rear rack. Matching these to DTTZH’s own model sheet:
| Spec (DTTZH spec sheet) | F6 | F6S | F6 Pro |
|---|---|---|---|
| Battery | 48V 15Ah (720 Wh) | 48V 25Ah (1,200 Wh) | 60V 30Ah (1,800 Wh) |
| Peak power | 750W–2,000W | 3,000W | 5,000W |
| Max torque | 60 Nm | 80 Nm | 100 Nm |
| Top speed | 20–33 mph | 38 mph | 50 mph |
| Throttle-only range (claimed) | 24 miles | 35 miles | 45 miles |
| PAS range (claimed) | 60 miles | 80 miles | 100 miles |
| Brakes | Mechanical disc | Hydraulic disc | Hydraulic disc |
| Charge time | 5–7 hours | 8–10 hours | 10–12 hours |
| Max climbing grade | 25° | 35° | 40° |
| Weight | 34 kg (~75 lbs) | 34 kg (~75 lbs) | 48.5 kg (~107 lbs) |
| Max load | 150 kg (330 lbs) | 150 kg (330 lbs) | 150 kg (330 lbs) |
Shared by all three: 20″ x 4.0″ fat tires, full suspension, 7 speeds, NFC and password unlock, and a high-carbon steel frame.
Note that DTTZH’s pages don’t always agree on top speed: the combined F6 page says 20–30 mph for the base F6, and the single-model page says 20–33 mph. The F6 Pro page lists 50 mph. Treat all top speeds as manufacturer claims.
Our take: For most buyers, the base F6 (48V 15.6Ah option on Amazon) is the sensible pick. The F6S and F6 Pro add power and hydraulic brakes, but their top speeds put them outside US e-bike classes (see the legal section below).
Base F6 at a Glance (Amazon Listing)
| Spec | What the Amazon listing says |
|---|---|
| Motor | 750W in the title; “peak 2000W brushless motor” in the bullets |
| Battery | 48V 15.6Ah removable (about 749 Wh by the math) |
| Charger | 3A, full charge in 5–7 hours |
| Claimed range | 22 miles throttle-only, 60 miles PAS |
| Riding modes | 3: pure electric, pedal assist (PAS), manual |
| Gears | 7-speed, twist-grip shifter, rear derailleur |
| Brakes | Disc |
| Suspension | Hydraulic front shock plus rear shock |
| Wheels and tires | 20″ x 4″ integrated one-piece wheel |
| Frame | High carbon steel |
| Unlock | NFC card or 4-digit password |
| Display | 4-inch color LCD (speed, battery, mode, mileage, time) |
| Safety | UL 2849 certified (as stated on the listing) |
| Assembly | 95% pre-assembled |
| Warranty and returns | 1-year warranty, 30-day returns |
Small differences from DTTZH’s own sheet: Amazon says 15.6Ah and 22 miles of throttle range, and DTTZH’s site says 15Ah (720 Wh) and 24 miles. The gap is small. We use the Amazon figures for the version you’d buy there.
Keyless NFC Unlock and Color Display
This is the F6’s signature feature. Instead of a key, you tap an NFC card on the display or enter a 4-digit code. That’s handy if several people in a household share the bike, and there’s no ignition key to lose. The 4-inch color LCD shows speed, battery level, riding mode, mileage and the time, and DTTZH says it stays readable in direct sunlight.
Keep in mind that keyless unlock stops someone from riding the bike away. It doesn’t stop theft. You still need a proper lock, and the removable battery has its own lock. See our essential fat bike accessories for locks that suit a heavy e-bike.
Motor, Battery and Real-World Range
The F6 uses a brushless hub motor with an alloy casing that DTTZH says helps it shed heat. The title says 750W, and the bullets lead with a 2,000W peak. DTTZH’s own sheet gives the base F6 60 Nm of torque. That’s modest next to some rivals, such as the TST 1500W at a claimed 90 Nm (R002 figure), so expect brisk but not punchy acceleration with a heavy rider on steep hills.
Our range estimate
Using a typical 20–25 watt-hours per mile for a heavy fat bike ridden with a mix of throttle and assist:
- Base F6, 48V 15.6Ah (about 749 Wh): 749 ÷ 25 = about 30 miles; 749 ÷ 20 = about 37 miles.
- F6S, 48V 25Ah (1,200 Wh): about 48–60 miles.
- F6 Pro, 60V 30Ah (1,800 Wh): about 72–90 miles at normal e-bike speeds. Ridden near its top speed, it will use far more energy per mile.
These are our estimates, not test results. DTTZH’s own 22-mile throttle-only figure for the base F6 is a good reminder of how fast range drops when you don’t pedal. Try your own numbers in our range calculator.
Estimate your own range for this bike
Pick the battery option you are looking at; it is filled in for you. Adjust your weight, temperature, terrain and hills in our free range calculator.
Calculate DTTZH F6 range (15.6Ah) → F6S 25Ah → F6 Pro 60V 30Ah →Charging: The included 3A charger takes 5–7 hours for the base battery, according to the listing.
Frame, Suspension and Ride
The frame is high-carbon steel, which is strong but heavy. At about 75 lbs (DTTZH’s figure for the F6 and F6S), this isn’t a bike you’ll want to carry up stairs. The listing describes a hydraulic front shock and a rear shock, plus “integrated one-piece” 20″ x 4″ wheels. The long bench seat is comfortable, and it’s long enough for a small second rider, though you should check your local laws and the 330 lb maximum load before carrying a passenger.
DTTZH’s FAQ gives a weight limit of about 300–330 lbs for its bikes. That’s lower than some rivals (the TST lists 450 lbs), so heavier riders carrying cargo should take note.
Brakes and Gears
- Brakes: DTTZH’s spec sheet says the base F6 has mechanical disc brakes, and the F6S and F6 Pro have hydraulic disc brakes. The Amazon listing just says “disc”. On a 75 lb bike, mechanical discs need regular adjustment and a firm squeeze. If you plan to ride above 20 mph, hydraulic brakes are a real advantage.
- Gears: 7-speed rear derailleur with a twist-grip shifter.
- Modes: Pure electric (throttle), pedal assist and manual.
Pros and Cons
Pros
- Keyless NFC card or password unlock
- Bright 4-inch color display
- UL 2849 certification stated on the listing
- Full suspension and 20″ x 4″ fat tires
- Removable battery with a 3A charger included
- 1-year warranty and 30-day returns, per the listing
- 95% pre-assembled
Cons
- Heavy high-carbon steel frame (about 75 lbs; about 107 lbs for the F6 Pro)
- Mechanical disc brakes on the base F6
- Modest 60 Nm torque on the base model
- 330 lb max load is lower than some rivals
- One Amazon listing mixes three very different bikes, so it’s easy to pick the wrong one
- F6S and F6 Pro speeds are well beyond US e-bike classes
Who It’s For, and Who Should Skip It
Buy the DTTZH F6 if you:
- want a comfortable moped-style e-bike for commuting, errands and light trails
- like keyless unlock and a modern color display
- want UL 2849 certification, for example to meet building rules
- share the bike with family members and want password access
Skip it if you:
- weigh close to the 330 lb limit, with cargo included
- need to lift the bike regularly
- want hydraulic brakes but don’t want to buy the faster F6S or F6 Pro
- want a bike that’s road-legal at its top speed without restrictions
Compare it with the TST 1500W, which lists a higher 450 lb load and 90 Nm torque (R002 figure), or browse all five models in our Amazon fat tire e-bike guide.
Is the DTTZH F6 Street-Legal in the US?
DTTZH says the base F6 is made as a Class 2 e-bike under US federal law (16 CFR Part 1512), with a factory top speed of 20 mph for street use. That matches the 750W rating in the Amazon title. In that 20 mph setting, it fits Class 2 rules in most states.
DTTZH also warns that unlocks, software changes or “Off-Road Modes” that exceed local limits are meant for private property only, can void the warranty and may break local laws. That applies to the base F6 above 20 mph, and even more to the F6S (38 mph) and F6 Pro (50 mph). At those speeds, many states treat a vehicle as a moped or motorcycle, with registration, license and insurance rules.
Check your state and city rules before you buy, and wear a helmet. Our accessory fit guide shows which racks, fenders, tubes, pumps and locks fit 20″ x 4″ fat bikes, and our essential accessories guide covers helmets and lights.
Setup Checklist After Delivery
- Tighten everything: handlebar, stem, axles and pedals.
- Adjust the brakes and bed in the pads with gradual stops before riding fast.
- Set tire pressure within the range printed on the sidewall.
- Set up your NFC card and password before the first ride, and keep the spare card somewhere safe.
- Fully charge the battery with the supplied 3A charger.
- Keep the original packaging for a while, since the listing’s 30-day return requires it.
FAQ
Did you test the DTTZH F6?
No. We did not physically test this bike. This review is based on the Amazon US listing (ASIN B0FR3HHTP6) and DTTZH’s published specifications. Range figures are our estimates using battery capacity, not measured results.
What’s the difference between the F6, F6S and F6 Pro?
According to DTTZH, the F6 has a 48V 15Ah battery, 60 Nm and mechanical discs. The F6S has 48V 25Ah, 80 Nm and hydraulic discs. The F6 Pro has 60V 30Ah, 100 Nm, hydraulic discs and weighs about 107 lbs. Top speeds rise from 20–33 mph to 38 and 50 mph.
How far can the base F6 go?
The listing claims 60 miles on pedal assist and 22 miles on throttle only. Our estimate for mixed riding is about 30–37 miles.
Is it UL certified?
The Amazon listing states UL 2849 certification. That standard covers the e-bike’s electrical system as a whole.
How much weight can it carry?
DTTZH lists a 150 kg (330 lb) maximum load.
Where can I check the current price and options?
Prices change often, so check the current price and battery options on Amazon.