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RHYTHM FUN D3 Indoor Cycle

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weight
Flywheel
weight
ResistanceFitness
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RHYTHM FUN D3

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L: 44"
W: 22"
H: 51"
300 lbs35 lbsMagneticTime,
Speed,
Distance,
Odometer,
Calories,
Goals,
Scan

The RHYTHM FUN D3 is one of the indoor cycling bikes released in 2021. In terms of features, it can be compared with the Sunny Health & Fitness SF-B1851. It has a slightly lighter flywheel and fewer grips on the handlebar, but on the other hand, it excels in overall aesthetics.

Key Features and Specifications

  • Assembled dimensions: 44L x 22W x 51H inches (112L x 56W x 129H cm)
  • Flywheel weight: 35 lbs (15.8 kg)
  • Assembled weight: 77 lbs (35 kg)
  • Supported weight: 300 lbs (136 kg)
  • Seat: 4-way adjustable
  • Drive system: Belt
  • Resistance: Manual magnetic
  • Fitness monitor: Time, speed, distance, odometer, calories, goals, scan
  • Warranty: 12 months

Frame construction

The RHYTHM FUN D3 is an exercise bike made for spin workouts so it has a pretty sturdy construction. Its frame is made of oval steel tubing, double coated with a corrosion-resistant paint finish. The main color used for the frame is white, while the seat and handlebar posts have a gray paint finish. The flywheel is chrome-plated.

The bike also integrates several plastic parts. For example, the side covers of the flywheel, the guards of the magnetic brake, and the belt guard are made from a durable thermoplastic material.

The bike’s frame features a triangular design for improved sturdiness. It also has a step-up bar; this is the small tube welded to the seat tube and the main oblique frame tube. Not all spin bikes have this feature. Also, not only that this particular tube can help a little with mounting, dismounting, stretching, and a variety of other exercises, it improves the overall frame sturdiness.

The bike is not too large. With all the parts assembled, it is 44″ (112 cm) long, and 22″ (56 cm) wide. It is recommended, though, to allow some clearance all around it for easy access. So, the minimum recommended usage area for it is around 90″L x 60″W (228 x 152 cm).

The bike is not super-heavy. Its net weight is approx. 77 lbs (35 kg). Therefore, it can be carried and assembled by only one person. Also, once the bike is assembled, it can be moved even easier as its front base bar has a set of transport wheels.

Seat and handlebars

The RHYTHM FUN D3 indoor cycling bike is equipped with a pretty standard saddle. It is constructed on a nylon shell with a top cover made from high-density closed-cell foam. It has a median groove for improved breathability. It does not have suspensions for extra shock absorption, like the saddle included with the HITOSPORT S703B bike, for example, but still provides a pretty decent comfort. Also, its attachment system is standard collar-type so you can easily find replacements for it if needed, and you can also tilt it slightly.

The seat assembly is four-way adjustable (up, down, front, back). Its upright post offers approx. 8.5″ (21.5 cm) of adjustment, from 34.25″ to 42.93″ (87 – 109 cm). Also, its horizontal slider adds a few inches of front-to-back adjustment. This being said, the bike should be able to accommodate users between 5’0″ and 6’5″ (153 – 196 cm) with no problem, allowing a complete leg extension for any user within this height range. It is also rated for a maximum user weight limit of 300 lbs (136 kg).

The bike’s handlebar has a multi-grip design. It offers the possibility to adopt a climbing grip, an off-road grip, an aero grip, and a close grip. As opposed to the seat, it is only 2-way adjustable. It does not have the horizontal slider for front-to-back adjustment. Its upright post has 5 adjustment positions, with an adjustment span of approx. 4″ (10 cm).

The handlebar is completely rubberized so it provides a comfortable and secure grip. It’s important to mention, though, that it does not have pulse sensors. Also, the fitness monitor does not have a pulse tracking function.

Resistance system

The RHYTHM FUN D3 indoor cycle features a magnetic resistance system. It is not a motorized bike, though, so you don’t need a power adapter or power cable for it. The resistance adjustment is completely manual, but this also means that the included fitness monitor cannot adjust the resistance automatically and does not have pre-set programs.

The bike’s resistance system consists of a magnetic brake which is attached to the frame above the flywheel and concealed by two large ABS guards. The tension knob on top of the frame is connected to the brake. Therefore, when you turn this knob clockwise, the magnets move closer to the flywheel which increases the pedaling difficulty.

The bike’s resistance system also has an emergency brake feature. The magnetic brake pad has a small felt pad at the front. Therefore, if you press the adjustment knob, the felt pad will come in contact with the flywheel and stop it from spinning.

The tension knob does not have pre-determined resistance settings on it. You simply turn it right or left until the bike provides a resistance level you’re comfortable with. But as a general idea, with the magnets at their closest point to the flywheel, the bike provides a pretty decent resistance, simulating a steep hill climb.

Needless to say, the main advantage of the magnetic brake is that the magnets do not touch the flywheel. This leads to a very smooth flywheel motion. Also, the bike generates very little noise when in use and since the magnets do not touch the flywheel, there is virtually no wear and tear on the brake pad.

Drive system

This RHYTHM FUN exercise bike is equipped with a fairly heavy flywheel. It weighs 35 lbs (15.8 kg) and has a perimeter-weighted design. This type of construction is meant for a more aggressive inertia and a more stable pedaling motion. Most bikes in spinning classes feature flywheels with a similar construction.

Like most other exercise bikes, the RHYTHM FUN D3 does not allow coasting. If you stop pedaling, the flywheel will also stop from spinning and the monitor will stop recording distance, calories, etc. Pedaling in reverse is possible, though, so you can alternate forward with backward pedaling sessions.

The bike is equipped with a heavy-duty crankset. Its arms are similar to the ones on road bikes; they’re made of steel and have a chrome-plating finish. The pedals are not metallic, but they’re made from a heavy-duty nylon material so they should be able to hold you even while standing up on them with no problem. They do not have SPD clips, only toe cages. However, they have standard 9/16″ threads, so compatible replacements are widely available, in case you will ever want/need to change them.

The bike’s drive system uses a multi-groove rubber belt. This type of transmission comes with a few advantages. First of all, you don’t have to ever lubricate it. Second of all, it delivers a very smooth pedaling motion. And lastly, it generates almost no noise when it is in use.

Fitness monitor

The RHYTHM FUN D3 indoor cycle comes with the same type of fitness monitor as the previous bike model. It features an LCD display that tracks time, speed, distance, total distance, and calories burned. It does not have a pulse reading function.

The bike does not have Bluetooth connectivity and it is not compatible with any fitness apps. Also, the fitness monitor does not have any pre-set programs. However, it does have a goal-setting function. Its “Set” button offers the possibility to select a workout goal for time, distance, or calories burned. If a goal is selected, the display will count down from the selected value as you pedal, until you have completed your goal.

The unit’s “Mode” button covers the selection function. You can press it repeatedly to select the workout metric that you want to view on the display. This way, you can also select the Scan Mode which automatically rotates all the metrics showing each one for a few seconds. Finally, the “Reset” button clears all the values on the monitor to zero, except for the odometer.

The monitor unit is battery-powered. It requires two AA batteries which are included. It begins tracking your data when you begin pedaling. It also automatically turns off if it does not detect flywheel movement for more than four minutes.

Assembly and Maintenance

The main frame of the bike comes pre-assembled, with the magnetic brake, the flywheel, the crankset, and the belt already attached. You only have to add the two base bars, the seat, the handlebar, the pedals, and the fitness monitor. This shouldn’t take more than 30 minutes of your time. All the necessary tools are included and the manual provides clear assembly instructions.

The bike’s maintenance doesn’t require much. All you have to do is keep it clean, wipe the sweat that might fall onto the frame at the end of the workout, and periodically check for loose bolts and parts. The drive system does not require any maintenance.

The Pros

  • Sturdy construction – can support users up to 300 lbs;
  • Aesthetic design;
  • Transport wheels;
  • Adjustable levelers on both base bars;
  • 4-way adjustable seat;
  • Maintenance-free belt drive;
  • 35 lbs perimeter-weighted flywheel for improved inertia;
  • Frictionless magnetic resistance;
  • Integrated felt pad for emergency braking;
  • Durable pedals with toe cages and standard threads;
  • Fitness monitor with device holder – it tracks time, distance, total distance, speed, and calories burned;
  • Target settings for time, distance, and calories;
  • Tablet holder included;
  • Easy to assemble;
  • Little maintenance required.

The Cons

  • No pulse reading function;
  • No LED backlight on the display;
  • No bottle holder.

Summary

The RHYTHM FUN D3 is an indoor cycling bike made for home use. It is equipped with a manual magnetic resistance system, a 35-lb perimeter-weighted flywheel, a 4-way adjustable seat, and a basic fitness monitor. It’s rated for a maximum user weight limit of 300 lbs and should be able to accommodate users up to 6’5″. It’s a bike for spin workouts, high-intensity cardio, stamina development, and weight loss.

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