Sunny Health & Fitness Indoor Stationary Exercise Bike, 4-Way Adjustable Seat for Cycling Cardio workout at Home, Optional 49 LB Flywheel, Heavy-Duty & Free SunnyFit App Bluetooth Connect

I've had this bike for five weeks and use it 5-6 times weekly. I did a good deal of research on Sunny and other manufacturers of stationary bikes before purchasing this model. Amazon purchasers answered my questions and I found several indoor gym sites gave this bike excellent reviews. I did, however, purchase a Smart Guard five-year warranty, since the bike is made in China.It took about twenty-five minutes to assemble. Follow the minimal directions completely and don't cut corners. All tools come with the bike, which is nearly fully-assembled. All you have to do is add the pre-assembled seat base, the handlebars, pedals, cupholder, and the two base stands. Very easy. The bike is very well made and very well protected for shipping.The flywheel weighs nearly forty pounds, so, even a light resistance setting provides a good workout. The resistance adjustment knob allows for very fine tuning with only slight twists, allowing you to change settings easily and quickly while pedaling. You will get the best lower-body workout by riding hands free and sitting upright. The pedals have racing straps attached so your feet remain stable. You can easily stand up to ride, if you like.The bike is extremely quiet. You could use it in a room with a sleeping baby and not wake it. I'm glad I chose the belt-driven over the chain model. Reviewers agreed (here and elsewhere) that the belt-driven model is the better choice.The seat that comes with the bike is a racing seat. After two weeks, as I increased my riding time, it was too uncomfortable to use. I purchased the Bell Sports 7015679 Memory Foam Bike Seat from Amazon. Fits perfectly (you'll need to know how to change a bike seat, since it comes with no directions). The seat attachment base allows only minor forward-backward adjustment. I'm 5' 10" and have no problem reaching the handlebars; but I rarely use them. Again, you get the best workout by riding hands-free.Since this bike has no gears, you can't "coast," as on a real bike. Only a moron would attempt to dismount before coming to a complete stop. The bike is not a hazard or dangerous; it simply requires common sense (which seems to be in short supply these days) while using it.If you are not comfortable with Sunny's manufacturing quality, I would suggest getting a warranty. That way you won't have to deal Sunny at all. It does add to the cost of the purchase (~$80), but Sunny's bike is far less expensive than competitors. I probably would not purchase a warranty again, however. The bike far exceeded its presumed quality.I have been pleasantly surprised with the purchase and have found absolutely nothing cheap in its construction. Rock solid, quiet, well-manufactured. It's great to be able to exercise at home; this bike provides a great workout. I would recommend it to anyone.

Delivered quickly and well packed. Exterior or package showed evidence of a drop on one corner, but only apparent damage was a significantly deformed packing strut (intended to be discarded). Instructions for assembly and adjustment were complete and useful. Insertion and adjustment of seat and handlebar columns required dead-blow hammer force, but as adjusted are completely stable -- no wobble or loosening, Based on other review comments, I replaced the supplied saddle with one I knew to be comfortable for me, along with the supplied pedals with clipless pedals. I also installed standard wired bike computers, using alternate spoke magnets and sensor attachment methods (double sided tape, longer zip ties and wood spacers). Time, cadence, speed, distance and other statistics are now available. As I have only had the unit a short time, with about 15 hours of use, long term durability is unknown. Operation has been excellent. Entire unit is rock solid, operation is virtually silent, and resistance device works well.REVIEW UPDATE - after four months use (approx. 100 hours/2500 odometer Kilometers). The five star rating remains unchanged.Details on bike computer installation:Most bike computers are based on a clock, micro-switch to sense magnet attached wheel & or pedal crank, and memory of a manually input wheel circumference) with statistics reported calculated from these three elements, As I wished to have continuous display of speed and and pedal rpm as well their session averages I chose to use two separate single sensor computers. Wheel circumference setting input to yield speed was the measured flywheel circumference, 1460 mm (57.5 inches) about the same as for a 409 bike tire size. Wheel circumference setting on input to yield pedal revolutions was 167 mm (correct conversion factor is actually 1667 mm, but because of specific input limits of computer used, the lower amount was used. Resulting "speed" mode display is 1/10 or actual crank revolutions per minute, with two displayed digits after the decimal point (for example, 100 RPM is displayed as speed of 10.00).The actual computers selected were Sunding model SD 558A because of display size and price (actually paid less than $5 for both, but currently available on internet for about $12 a piece). Their sensors are wired. Virtually any available bike computer could be substituted, but specific mounting and setting procedures might be required.The computers with their display screens mount on the center of the handlebar using the supplied mounts and zip ties. Because of the cycle frame configuration, sensor mounts required fabricated shims and longer 11 inch zip ties (the originally used tape eventually lost its grip).The shim for the RPM sensor is approximately 1/4 " X 4 1/2" x 2" with 2 drilled holes in one end to secure the sensor to the shim with supplied zip ties, and two 11" zip ties around the upper belt guard and shim secured it in place . 3 11" zip ties secured the sensor wire to the frame between the sensor and its display head. I replaced the supplied wheel magnet with a .75" round ceramic magnet attached with only its own force to the right pedal crank arm at the inside of the pedal.The shim for the speed sensor is approximately 1 3/8" X 5/8" X 4" 2 holes drilled in one of the 1 3/8" sides to secure 11" zip ties to the left front bike fork and 2 holes opposite them to secure the sensor with two supplied zip ties. An additional 2 11" zip ties secured the speed sensor wires to the bike frame between the sensor and its display head. I replaced the supplied wheel magnet with a .75" round ceramic magnet attached with only its own attraction to the flywheel, just below its rim.The resistance device works well, with proportionate increases in resistance with knob turns, no noise or vibration and no odor.I did spray the resistance pad with silicone lubricant before use and again after about two months use when a minor vibration had developed, I assume this will be a normal maintenance requirement, a two second burden I can live with.I contacted Sunny Sports and Fitness at their customer service web address to determine where cycle model specific parts could be obtained. A response arrived the same day that they could supply my needs (a resistance pad assembly and seat tube sleeve plastic sleeve). cost incl. postage was $12.50, which I consider a bargain.The water bottle holder presented two problems to me. In its original position, my right knee would occasionally bump the holder as I performed jumps (I am not yet as smooth at these as I should be). Relocating the holder to the front of the fork frame and reattaching with 2 11" zip ties solved this issue. The 28 oz. water bottle I use did not slide into the holder easily. Slight bending of the top of the holder front and rear wires improved the bottle fit.