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Sunny SF-B904 Indoor Cycling Bike

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ITEM# 12287096
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    Sunny SF-B904 Indoor Cycling Bike
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    ITEM#: 12287096

    Get fit with a home gym machine from Sunny. The exercise bike features new magnetic resistance for a smooth and quiet workout.

    • Heavy-duty steel frame
    • Fully adjustable seat
    • Fully adjustable handlebars
    • Heavy-duty crank
    • Clip pedal not included
    • Eight level tension control
    • Transportation wheels for easy portability
    • Maximum user weight: 220 pounds

    This product is not intended for commercial use. It is designed for home use only. Any commercial use of this product will void the warranty.


    Assembly Assembled
    Cycle Handle Bar Racing
    Cycle Pedal Standard
    Cycle Resistance Adjustable Strap Resistance
    Cycle Seat Positioning Adjustable
    Weight Capacity Less than 250 lbs
    Dimensions 47.0x19.0x40.0
    Model Number SF-B904

    Customer Reviews

    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    • Stationary Bike

      The handlebars do not extend up very far so you are forced to "ride" in a very aggressive position. The seat is also very stiff.

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    • Not for me

      This bike hurt my lady parts SOMETHING TERRIBLE. And no matter how many times I tried, the pain never went away. I had to return it .

      Read More
    • Very quiet and easy to move

      So far I am very happy with this bike. The seat is very uncomfortable so I replaced it, as other reviewers have suggested. I ordered this because I have problems with my feet, so treadmill use is not an option for me. I am pleased with my purchase and was amazed by the speedy delivery.

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    • Smooth, Quiet, and Compact

      My wife and I shared our New Years resolutions with each other, and wouldn't you know we both wanted to lose weight. We researched many models of exercise bikes, and came upon this one (the Sunny SF-B904. What the heck brand is "Sunny"? Who knows, but they make a solid product. It comes partially assembled and it took about 30 minutes to piece together. Much to my surprise it's very sturdy... and silent. The tension is produced by magnets that move closer to the wheel to make it harder to pedal. No friction = no noise. So, my wife can ride in front of the TV without having to blast the sound. The only drawback is the highest tension level isn't that hard. We're not pro athletes so it's fine for us. If you're training for the Tour d' France, you'll need something more powerful. Also, there is no timer, or gauges or anything, but I take that as a plus. Less distraction and electronics that can break down someday. All in all, we're very pleased with this product, and I would highly recommend it. Now, we just have to use it!

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    • Great Spin Bike for Price!

      I bought this to help me train for my half ironman since there is so much time spent training for the bike portion and I have 3 kids so getting out for 2-3+ hours to bike is difficult! I LOVE this bike! For the price it is a great spin bike and does a great job and super easy to assemble! It did NOT come with instructions but was so easy I figured out where everything went (took me about 15 minutes). I've gotten plenty of riding time on it and it has held up to my kids' playing on it. GREAT Purchase!!!!

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    • Great for the money

      After changing to a gym that didn't offer spinning classes I decided my withdrawls outweighed my desire to focus on the treadmill and I bought this after doing some research. I wanted the B-901 model but it was unavailable and overpriced on another site. This bike is QUIET! It was easy to put together by myself and wheels from one room to another very easily. The seat did leave me "saddle sore", but is no different than any other spinning bike you'd find at the gym. Just like when I first became addicted to spinning I gave myself a few days to get over the initial soreness and worked through the leftovers. After a couple weeks it went away. If you have super strong legs to begin with, this bike may be a little easier for you. The only reason I did'nt give it 5 stars is this: especially with higher resistance the magnet doesn't work as well against your weight when you stand up to pedal, it kind of "slips" a little faster halfway through the rotation. Controllable if you concentrate on it, but distracting because you have to concentrate on it. Otherwise this bike was a great buy for the money.

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    • Nice bike

      I had ridden a stationary bike over 150,000 miles. All it's replacements lasted short time. So I picked this hoping it would be a good long lasting bike. So far it appears to be just that. Very well constructed of solid steel. Wad happy with how quiet it is. I did buy a new seat that is wider and softer. Overall very pleased. My sister says it looks just like those at her fitness center for spin classes.

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    • good bang for the buck

      Very good purchase for the money. Very smooth and quiet. The magnetic resistance makes it very easy to maximize your workout. The only two things that I would change would be adding a water bottle holder (It doesn't have one) and a transitional resistance change lever instead of a detent one.

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    • great bike but...

      Awesome bike. I'm 5'4" took me 35 min to put together. i was going slow. the bike is very very quiet. i mean I could barely hear it over the TV. perfect! Sturdy. I'm not a major spinner, but I don't think i'll ever use the lower tension settings, so I feel like i may not get the best use of this bike longer term...but only time can tell for that comment. The only that's the seat of a road bike...tiny and really hard....i actually had to wear my padded bike shorts...if you're not used to long road bike rides, you'll probably want a new seat.

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    • Great bike for the $$

      I'm used to using the startrac spin cycle at the gym. I purchased this because my gym was up to an hour and a half wait time for spin class. This bike is very comparable to that modal. The only thing I wish it had was an emergency brake but hey $$ vs $1200 I say ** the brake. It's also cheaper then ten months at my gym and I don't have to wait. I will say however that the height is good for me at 5'5" but for my husband at 6'2" it is a little small but still do-able. I would recommend this to anyone into spinning because it really is a good bike and not a huge impact on a tight budget.

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    Questions & Answers

    Get your product questions answered right here.
    • does the handle goes up to an upright position?

      • Hello naomikehati, yes the handle bars can be adjusted up and down. Have a great day!

    • Does the pedal have an underside that allows you to clip in cycling shoes?

      • Thank you for contacting us scummings85. This has no clip pedal on this model bike. SF-B1003 is our only model with clip pedals. Please let us know if you have any further questions.

    • What is the minimum recommended height that the user can be?

      • I am 5'2" and find the sizing ok. Probably would not want to be much small,but it does adjust back and forth with the seat and up and down. The handle bars adjust up and down. I can reach the floor with my feet just fine.

    • What is the flywheel weight?

      • According to the Sunny website it is a 26lb flywheel. Was trying to find that info myself and was able to locate it. Hope this helps!:)

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    Shipping & Returns


    Usually leaves our warehouse in 1 business day. *

    Standard Return Policy:

    Items must be returned in new or unused condition and contain all original materials included with the shipment. More Details

    FINAL SALE EXCLUSION: Items marked as FINAL SALE are not returnable unless the problem you experience is the result of our error.

    Shipping Information:

    Our standard shipping method is ground shipping. We also offer expedited shipping for most items. Your final shipping cost and estimated delivery timeframe will be available at checkout.
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    For your protection, all orders are screened for security purposes. If your order is selected for review, our Loss Prevention Team may contact you by phone or email. There may be a two business day delay to process your order.

    ** Most Oversize orders are delivered within 1-4 weeks. Some orders may take 6 weeks to be delivered.

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