---
product_id: 207694000
title: "Indoor Cycling Exercise Bike w/Pulse Sensors & 4-Way Adjustable Seat, Stationary Home Cardio Training Machine w/Micro-Adjustable Magnetic Resistance for Intensive Cardio Session"
brand: "sunny health & fitness"
price: "12302 Lei"
currency: RON
in_stock: true
reviews_count: 8
category: "Sunny Health & Fitness"
url: https://www.desertcart.ro/products/207694000-indoor-cycling-exercise-bike-w-pulse-sensors-and-4-way
store_origin: RO
region: Romania
---

# Micro-adjustable magnetic resistance for precise control Near-silent belt-drive for distraction-free rides 40-lb cast-iron flywheel for smooth momentum Indoor Cycling Exercise Bike w/Pulse Sensors & 4-Way Adjustable Seat, Stationary Home Cardio Training Machine w/Micro-Adjustable Magnetic Resistance for Intensive Cardio Session

**Brand:** sunny health & fitness
**Price:** 12302 Lei
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Ride Smart, Ride Silent, Ride Strong — Your Ultimate Home Spin Upgrade!

## Quick Answers

- **What is this?** Indoor Cycling Exercise Bike w/Pulse Sensors & 4-Way Adjustable Seat, Stationary Home Cardio Training Machine w/Micro-Adjustable Magnetic Resistance for Intensive Cardio Session by sunny health & fitness
- **How much does it cost?** 12302 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/207694000-indoor-cycling-exercise-bike-w-pulse-sensors-and-4-way)

## Best For

- sunny health & fitness enthusiasts

## Why This Product

- Trusted sunny health & fitness brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last & Move:** Heavy-duty alloy steel frame supports up to 300 lbs with transport wheels for easy repositioning in your space.
- • **Tailored Fit Comfort:** 4-way adjustable seat and 2-way handlebars ensure ergonomic alignment for every body type.
- • **Powerful Momentum Engine:** 40-lb flywheel delivers consistent, gym-quality cycling momentum for an intense cardio burn.
- • **Whisper-Quiet Performance:** Silent belt-drive mechanism lets you ride anytime without disturbing your home or neighbors.
- • **Real-Time Metrics & Smart Sync:** Integrated pulse sensors and LCD monitor track speed, RPM, calories, and heart rate; pairs with SunnyFit app for immersive workouts.

## Overview

The Sunny Health & Fitness SF-B1851 Indoor Cycling Bike combines a robust 40-lb cast-iron flywheel with whisper-quiet belt drive and micro-adjustable magnetic resistance, delivering a smooth, customizable workout experience. Designed for professional-grade performance at home, it features pulse-sensing handles, a clear LCD monitor, and a tablet mount compatible with the SunnyFit app’s 1000+ workouts. Its ergonomic 4-way adjustable seat and 2-way handlebars ensure personalized comfort, while a sturdy alloy steel frame supports users up to 300 lbs. Perfect for millennials seeking an efficient, space-conscious cardio solution that blends tech-savvy tracking with durable design.

## Description

desertcart.com : Sunny Health & Fitness Synergy Exercise Bike with 40LB Flywheel, Silent Belt Drive & Magnetic Resistance, Indoor Bicycle with 300 LB User Weight Capacity, Tablet Mount, Adjustable Seats – SF-B1851 : Sports & Outdoors

Review: Excellent Peloton DIY - My local gym was closed for months, was able to open for a short time, and recently closed down again. So during this COVID time, I need something that I can do at home. I live in MN, and exercise outside in the winter is not an option for me. I have not taken a spin class for 15 years, but a spin bike is more in my budget than a treadmill. Plus, treadmills need a lot more space and when they break down the fixing can be pricey. So, spin bike, here we go! Like other reviewers, I wanted a Peloton, however, let's be real if you are looking at this bike, spending $2500 on a bike plus monthly subscription of $40 is probably not in your budget either! You are benefiting from my research! As I looked, there is pretty much a bike for everyone's budget. I am keeping my gym membership, so I did not want to spend an exorbitant amount. I was going to get one with a belt and 45-pound flywheel, but then I stumbled upon this one. The availability, magnetic wheel, price, super fast desertcart Prime shipping, the iPad shelf, and the "computer" are what sold me. I have seen a few reviews with damaged boxes, mine was fine, and I think the great packing job would totally protect the bike. It took about 30 minutes to assemble...thank you for your help, Husband! Once put together, it was easy for him to carry it to the next room (probs about 80 pounds). I have the bike in a carpeted room with a plastic chair mat under it. I will not be rolling it around, but I think it would be pretty easy. I am 140 pounds and am 5'6". The bike is sturdy, I feel totally safe when I am up out of the saddle. Speaking of saddles, I replaced the giant seat right away. I got this one: https://www.desertcart.com/gp/product/B0845PGYYZ/ref=ppx_yo_dt_b_asin_title_o05_s02?ie=UTF8&psc=1 I may upgrade again or add a cushion, but I did not want to spend too much without being able to try it out. I have to (or should I say my backside has to) get used to spinning again! I knew the seat the bike comes with would be much too large for my preference. The size I got is more in line with the size of the seat on my road bike. I also upgraded the pedals. I want to use my road bike shoes (way more productive), so I got these pedals in the event my husband gets an inkling to go for a ride. I can clip in on one side, and he can use the cages on the other side. A nice compromise. https://www.desertcart.com/gp/product/B081BDDGJ8/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 If you want to use your road bike shoes exclusively, I'd recommend these: https://www.desertcart.com/gp/product/B000KC3Y0G/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1 The bike is silent! I mean silent! I'm pretty sure the magnetic resistance attributes to how quiet it is and, there should not really be any maintenance. The iPad holder and the stat reader are great. I only look at the rpm's (same as Peloton's "cadence") when I ride. The tracker goes between time, speed, distance, calorie, odometer, RPM, and Pulse. It is important to know that this device will not give you the most accurate readings of your performance because it has no way of knowing your body size and conditioning level. So expect them to be relatively generic. I use my own heart rate monitor and I still have to get an iPhone holder that I can attach to the bike, so I can see my heart rate app on my phone easier. I bought the Peloton app for $12/month (I did the 30-day free trial first) and watch it on my iPad. The iPad is quite secure in the holder. If you have a ROKU, you can watch the Peloton classes on your tv! The bike does not come with weight holders, and it is kind of annoying that you cannot buy the ones Sunny puts on the higher price point bikes a la carte. So, I am going to pay about $45 to get them on Etsy. I think the reason the other Sunny bikes are more money is that you would not have to "DIY" them. They come with weight holders and such.... I am COMPLETELY satisfied with my purchase! I think spinning would suck without the Peleton app (or another app or YouTube videos)...I mean it is pretty boring to just sit and pedal. Ride on, people. EDIT: A few people asked for some pics of the seat installation (I changed out the seat), and the tablet holder.
Review: Fantastic Stationary Bike - Perfect for Great Cardio Workouts - I spent several hours reading the reviews of all stationary bikes that met my criteria: 1. In stock w/free shipping; 2. Priced in the $300 - $400 range; 3. Four or more stars average review; 4. Newer model (not older than 2019); and 5. Magnetic resistance. There were a few that met all or most of these criteria, but this Sunny model had the overall best reviews and shipped the quickest (4 days from date of purchase), so I went with it. I'm really glad I did and I couldn't be happier. The bike was extremely well packed with plenty of protective wrap - in fact, it took about 20 minutes, give or take, just to get everything out of the box and unwrapped. It took another 35 minutes or so to assemble, and it was very easy to follow the directions. All of the necessary tools were included, which was nice if not completely necessary for me. I assembled it myself, which was no problem whatsoever. All parts were very well marked and the directions were clear. I've had the bike for 2 weeks now and have used it every other day. It operates as close to silently as any stationary bike I've ever used - it's really super quiet with no chance of it disturbing anyone. The resistance knob works smoothly, and with a couple full twists you will really feel the burn. A few people have asked if you can ride standing up, and yes, with the tension high enough, that was possible for me. I've never taken a spin class, so I don't know how this compares with what you'd use in a gym, but this really is just perfect for my needs. If it helps: I am in my mid-50's, 5 foot 11, and have about 20 - 25 pounds of winter/COVID weight I'd like to shed by Spring. This bike will definitely help me get there. The ride is comfortable and so smooth that I really enjoy working out on it. I signed up for a trial of the Peloton app and was able to do a couple HIIT workouts on this bike. Great workout, but I'll probably cancel the subscription once the trial ends, as I don't really need the encouragement or the routines provided by paid online classes. The only two slightly negative things I'll share are really just ideas for improvement: a. I wish the monitor that it comes with had a backlight , as I tend to work out with the lights out so I can better see my tv. This is a very specific wish list item, but it would definitely be useful to me, as I cannot see the monitor at all in the dark. Hardly a design flaw - I can't see most things in the dark! b. I wish the wheels that make it portable were a little larger and that I didn't have to tilt the bike quite so much to be able to access the wheels. In a large room with little furniture, this wouldn't be an issue at all, but in a confined space, it can be tricky to maneuver the bike and access the wheels for easy transport. I do, however, believe that this is a pretty standard design for this class of bike, and I doubt that other models implement this feature in a materially different way. Bottom line: the excellent reviews for this bike are definitely warranted. Workouts are fun, comfortable, efficient, and injury-free! I love this bike and would definitely recommend to anyone in the market with criteria similar to mine.

## Features

- 【40-LB FLYWHEEL】The swift 40-pound flywheel will make it easy to get your exercise cycling routine started, while also maintaining speed and consistency as you pedal. The cast-iron make prevents any issues with pulleys or loud sounds.
- 【SILENT AND SWIFT RIDE】Built with a modern near-silent belt-drive mechanism to give a smooth and consistent performance, removing any distractions as you work out no matter the time of day even when people are sleeping.
- 【MAKE YOUR SUNNY BIKE SMART】With an easy addition of our CB110 Cadence Sensor (sold separately), get everything you need to track cycling metrics. Pair with the Free Sunnyfit App to enhance your cycling with 1000+ workout videos synced to your bike.
- 【MAGNETIC RESISTANCE】The integrated magnetic resistance puts you in full control of your workout intensity. It delivers consistent performance that makes your workout easy when you want it, hard when you need it.
- 【PERFOMANCE MONITOR AND TABLET MOUNT】The LCD lets you check your speed, distance, RPM, pulse, and calories-burned at just a glance as you ride on your exercise cycle. Use our SunnyFit App with the tablet mount to ride with our free workout videos.
- 【PULSE-SENSING HANDLES】Monitor your cardiovascular performance with the built-in pulse-sensing grips so you can actively check your workout progress, displayed on the stationary bike performance monitor.
- 【DESIGNED FOR YOU】Soft, comfortable 2-way adjustable handlebars and 4-way adjustable seat lets you adjust your indoor bicycle to match your frame. The caged foot pedals can also be adjusted to fit your shoes, ensuring a comfortable ride.
- 【EASY TO USE】Intuitive dial to turn for resistance, emergency brake by pressing the dial, bottle holder, and dumbbell holder let you ride with ease. Built with transport wheels to make moving around a breeze, no matter the space.
- 【HEAVY DUTY & SAFE BUILD】Designed with strong and sturdy materials for optimal stability while cycling and supports users up to 300 LBs, made to provide you with a safe experience. Adjustable features, 40 LB flywheel, and more to keep users safe.
- 【PREMIER U.S.-BASED BRAND】With 20+ years of excellence, Sunny Health & Fitness delivers top-notch equipment dedicated to excellence. With our devoted support team and certified trainers enjoy an unmatched FIT FOR EVERYONE experience.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07Z45R1RT |
| Best Sellers Rank | #130,839 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #165 in Exercise Bikes |
| Brand | Sunny Health & Fitness |
| Brand Name | Sunny Health & Fitness |
| Color | Silver |
| Customer Reviews | 4.3 out of 5 stars 2,379 Reviews |
| Drive System | Belt |
| Global Trade Identification Number | 00815749012432 |
| Handle Material | Alloy Steel |
| Included Components | 2 AAA Battery, Assembly Hardware & Tools, Magnetic Exercise Bike, User Manual |
| Item Dimensions D x W x H | 22"D x 49"W x 46.5"H |
| Item Weight | 50 Kilograms |
| Manufacturer | Sunny Health & Fitness |
| Material | Alloy Steel |
| Maximum Height | 84 Inches |
| Maximum Weight Recommendation | 300 Pounds |
| Minimum Height | 152.4 Centimeters |
| Model Name | SF-B1851 |
| Model Number | SF-B1851 |
| Power Source | Battery Powered |
| Recommended Uses For Product | Indoor |
| Resistance Mechanism | Magnetic |
| Special Feature | Adjustable Seat |
| Special Features | Adjustable Seat |
| UPC | 815749012432 |
| Unit Count | 1.00 Pack |

## Product Details

- **Brand:** Sunny Health & Fitness
- **Color:** Silver
- **Item Weight:** 50 Kilograms
- **Material:** Alloy Steel
- **Maximum Weight Recommendation:** 300 Pounds
- **Power Source:** Battery Powered
- **Product Dimensions:** 22"D x 49"W x 46.5"H
- **Recommended Uses For Product:** Indoor
- **Resistance Mechanism:** Magnetic
- **Special Feature:** Adjustable Seat

## Images

![Indoor Cycling Exercise Bike w/Pulse Sensors & 4-Way Adjustable Seat, Stationary Home Cardio Training Machine w/Micro-Adjustable Magnetic Resistance for Intensive Cardio Session - Image 1](https://m.media-amazon.com/images/I/71mg-WQDRaL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Is the monitor battery only, or can it be plugged in to wall?**
A: The monitor uses a battery only.

**Q: I tried to change the seat, but the bolt(s) on the existing seat wouldn't budge with a wrench. Any tips, suggestions, warnings re changing the seat?**
A: Use 2 wrenches on both nuts. One to hold & one to unscrew.

**Q: My magnet will no longer stay in place. how do i go about fixing this? it stays close to the wheel no matter how light i go with resistance.**
A: I don’t know. I have no problems with this bike other than the seat being small and hard.

**Q: What is the lowest total height of the handlebars and device mount? I would like to place this underneath my standing desk.**
A: 41" inches. With the handlebars locked in in the lowest position, the measurement from the floor to the top edge of the device mount is 41". the handlebars are slightly lower than the top edge of the device mount.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent Peloton DIY
*by P***P on December 9, 2020*

My local gym was closed for months, was able to open for a short time, and recently closed down again. So during this COVID time, I need something that I can do at home. I live in MN, and exercise outside in the winter is not an option for me. I have not taken a spin class for 15 years, but a spin bike is more in my budget than a treadmill. Plus, treadmills need a lot more space and when they break down the fixing can be pricey. So, spin bike, here we go! Like other reviewers, I wanted a Peloton, however, let's be real if you are looking at this bike, spending $2500 on a bike plus monthly subscription of $40 is probably not in your budget either! You are benefiting from my research! As I looked, there is pretty much a bike for everyone's budget. I am keeping my gym membership, so I did not want to spend an exorbitant amount. I was going to get one with a belt and 45-pound flywheel, but then I stumbled upon this one. The availability, magnetic wheel, price, super fast Amazon Prime shipping, the iPad shelf, and the "computer" are what sold me. I have seen a few reviews with damaged boxes, mine was fine, and I think the great packing job would totally protect the bike. It took about 30 minutes to assemble...thank you for your help, Husband! Once put together, it was easy for him to carry it to the next room (probs about 80 pounds). I have the bike in a carpeted room with a plastic chair mat under it. I will not be rolling it around, but I think it would be pretty easy. I am 140 pounds and am 5'6". The bike is sturdy, I feel totally safe when I am up out of the saddle. Speaking of saddles, I replaced the giant seat right away. I got this one: https://www.amazon.com/gp/product/B0845PGYYZ/ref=ppx_yo_dt_b_asin_title_o05_s02?ie=UTF8&psc=1 I may upgrade again or add a cushion, but I did not want to spend too much without being able to try it out. I have to (or should I say my backside has to) get used to spinning again! I knew the seat the bike comes with would be much too large for my preference. The size I got is more in line with the size of the seat on my road bike. I also upgraded the pedals. I want to use my road bike shoes (way more productive), so I got these pedals in the event my husband gets an inkling to go for a ride. I can clip in on one side, and he can use the cages on the other side. A nice compromise. https://www.amazon.com/gp/product/B081BDDGJ8/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 If you want to use your road bike shoes exclusively, I'd recommend these: https://www.amazon.com/gp/product/B000KC3Y0G/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1 The bike is silent! I mean silent! I'm pretty sure the magnetic resistance attributes to how quiet it is and, there should not really be any maintenance. The iPad holder and the stat reader are great. I only look at the rpm's (same as Peloton's "cadence") when I ride. The tracker goes between time, speed, distance, calorie, odometer, RPM, and Pulse. It is important to know that this device will not give you the most accurate readings of your performance because it has no way of knowing your body size and conditioning level. So expect them to be relatively generic. I use my own heart rate monitor and I still have to get an iPhone holder that I can attach to the bike, so I can see my heart rate app on my phone easier. I bought the Peloton app for $12/month (I did the 30-day free trial first) and watch it on my iPad. The iPad is quite secure in the holder. If you have a ROKU, you can watch the Peloton classes on your tv! The bike does not come with weight holders, and it is kind of annoying that you cannot buy the ones Sunny puts on the higher price point bikes a la carte. So, I am going to pay about $45 to get them on Etsy. I think the reason the other Sunny bikes are more money is that you would not have to "DIY" them. They come with weight holders and such.... I am COMPLETELY satisfied with my purchase! I think spinning would suck without the Peleton app (or another app or YouTube videos)...I mean it is pretty boring to just sit and pedal. Ride on, people. EDIT: A few people asked for some pics of the seat installation (I changed out the seat), and the tablet holder.

### ⭐⭐⭐⭐⭐ Fantastic Stationary Bike - Perfect for Great Cardio Workouts
*by M***N on January 18, 2021*

I spent several hours reading the reviews of all stationary bikes that met my criteria: 1. In stock w/free shipping; 2. Priced in the $300 - $400 range; 3. Four or more stars average review; 4. Newer model (not older than 2019); and 5. Magnetic resistance. There were a few that met all or most of these criteria, but this Sunny model had the overall best reviews and shipped the quickest (4 days from date of purchase), so I went with it. I'm really glad I did and I couldn't be happier. The bike was extremely well packed with plenty of protective wrap - in fact, it took about 20 minutes, give or take, just to get everything out of the box and unwrapped. It took another 35 minutes or so to assemble, and it was very easy to follow the directions. All of the necessary tools were included, which was nice if not completely necessary for me. I assembled it myself, which was no problem whatsoever. All parts were very well marked and the directions were clear. I've had the bike for 2 weeks now and have used it every other day. It operates as close to silently as any stationary bike I've ever used - it's really super quiet with no chance of it disturbing anyone. The resistance knob works smoothly, and with a couple full twists you will really feel the burn. A few people have asked if you can ride standing up, and yes, with the tension high enough, that was possible for me. I've never taken a spin class, so I don't know how this compares with what you'd use in a gym, but this really is just perfect for my needs. If it helps: I am in my mid-50's, 5 foot 11, and have about 20 - 25 pounds of winter/COVID weight I'd like to shed by Spring. This bike will definitely help me get there. The ride is comfortable and so smooth that I really enjoy working out on it. I signed up for a trial of the Peloton app and was able to do a couple HIIT workouts on this bike. Great workout, but I'll probably cancel the subscription once the trial ends, as I don't really need the encouragement or the routines provided by paid online classes. The only two slightly negative things I'll share are really just ideas for improvement: a. I wish the monitor that it comes with had a backlight , as I tend to work out with the lights out so I can better see my tv. This is a very specific wish list item, but it would definitely be useful to me, as I cannot see the monitor at all in the dark. Hardly a design flaw - I can't see most things in the dark! b. I wish the wheels that make it portable were a little larger and that I didn't have to tilt the bike quite so much to be able to access the wheels. In a large room with little furniture, this wouldn't be an issue at all, but in a confined space, it can be tricky to maneuver the bike and access the wheels for easy transport. I do, however, believe that this is a pretty standard design for this class of bike, and I doubt that other models implement this feature in a materially different way. Bottom line: the excellent reviews for this bike are definitely warranted. Workouts are fun, comfortable, efficient, and injury-free! I love this bike and would definitely recommend to anyone in the market with criteria similar to mine.

### ⭐⭐⭐⭐ Solid, Silent, Smooth, Needs a Little Work
*by G***D on January 11, 2026*

This bike is gym-quality. Solid, silent, smooth. Easy to assemble. I’d give it five stars except the dumbbell holder, which was a major selling point, feels like an afterthought. The weights keep falling off. A little more engineering could have solved this. And the seat is uncomfortable. I shouldn’t have to buy an additional seat pad.

## Frequently Bought Together

- Sunny Health & Fitness Synergy Series Magnetic Indoor Cycling Exercise Bike
- Sunny Health & Fitness Non-Slip Home Gym Mat – Workout Floor Protection Foam Pad for Treadmill, Bike, Elliptical, Yoga and Exercise Equipment – Available in Multiple Size Options
- Temple Tape Ultra Gel Bike Seat Cushion - Extra Soft Bicycle Saddle Cover for Spin, Exercise Stationary Bikes and Outdoor Biking - Premium Accessories for Comfort While Cycling

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-03-16*