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Sunny SF-B904 Indoor Cycling Bike

Overall Rating Rating 4.8  |  14 reviews  |  Write a review
Today $308.99
Save $373.01 (55%)
Item #: 12287096
    With this indoor cycling bike, working out has never been easier. The bike has a heavy-duty frame for superior durability and a magnetic resistance that allows for quiet and smooth workouts. The transportation wheels make moving it a breeze....more
Sponsored Links What's This?
    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.
steel, foam
Model No:


  • Equipment
    Other Equipment
  • Assembly
  • Cycle Handle Bar
  • Cycle Pedal
  • Cycle Resistance
    Adjustable Strap Resistance
  • Cycle Seat Positioning
  • Fitness Machine Weight Capacity Range
    Less than 250 lbs
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Showing 5 most helpful reviews on this product.

  • 5 Stars 11
  • 4 Stars 3
  • 3 Stars 0
  • 2 Stars 0
  • 1 Stars 0
  • 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.

    • How accurate was the sizing? smaller than gym-grade
    • Please tell us about the quality of the product. seems sturdy, can take a beating
    • Was the product free of any manufacturer defects? yes
    • Would you recommend this to a friend? Yes
  • 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.

    • How accurate was the sizing? Exact
    • Please tell us about the quality of the product. Excellent
    • Was the product free of any manufacturer defects? Yes
    • Would you recommend this to a friend? Yes
  • 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.

    • Would you recommend this to a friend? Yes
  • 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.

    • Would you recommend this to a friend? Yes
  • 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.

    • How accurate was the sizing? Perfect
    • Please tell us about the quality of the product. Very heavy, well made, very sturdy doesn't move when I use it.
    • Was the product free of any manufacturer defects? yes- Perfect packaging. A lot of foam around it for protection in transit
    • Would you recommend this to a friend? Yes
View All Most Helpful Reviews
  • 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!

    • Would you recommend this to a friend? Yes

    bostonrick from Boston, MA, Jan 14, 2014

  • 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!!!!

    • How accurate was the sizing? great
    • Please tell us about the quality of the product. Great quality, easy to assemble and QUIET!
    • Was the product free of any manufacturer defects? Yes
    • Would you recommend this to a friend? Yes

    terminatormom from Omaha, NE, Mar 26, 2013

  • Perfect for a home workout room

    Easy assembly- 20-30 minutes. Very sturdy and quiet.

    • Would you recommend this to a friend? Yes

    lrk25 from New York, Mar 5, 2013

  • Glad I bought this bike

    This was a snap to assemble. The nuts were already in the bolts so you didn't have to search for the right size. I was using the bike in fifteen minutes. Smooth peddle action due to the magnetic break. I am able to get into the aerobic zone in five minutes and keep up the pace without feeling that I am on an exercise machine. It feels like my street bike. To heck with the cold weather and rain, I can ride this bike in the early rainy dark mornings while listening to the morning news.

    • How accurate was the sizing? fine
    • Please tell us about the quality of the product. High quality
    • Was the product free of any manufacturer defects? yes
    • Would you recommend this to a friend? Yes

    billofspfld from Oregon, Feb 12, 2013

  • spinning bike

    Nice sturdy bike .Good price for quality. Does not make much sound. We had to replace seat as it was a bit uncomfortable but other than that well recomended.

    • How accurate was the sizing? great, easy to adjust
    • Please tell us about the quality of the product. good quality
    • Was the product free of any manufacturer defects? yes
    • Would you recommend this to a friend? Yes

    jeanne1976 from Austin, TX, Feb 5, 2013

View All Most Recent Reviews

Product Q&A

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Does the pedal have an underside that allows you to clip in cycling shoes? scummings85 on Mar 29, 2013
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Answer This Question

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. overstockcustomercare1 on Apr 2, 2013

What is the minimum recommended height that the user can be? healthnut222 on Dec 30, 2012
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Answer This Question

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. ipodpam on Dec 31, 2012

What is the flywheel weight? barsenal on Jul 16, 2012
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Answer This Question

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!:) milehighfish on Jul 16, 2012

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