Product Overview
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Digital Monitor | Micro-Adjustable Resistance |
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30 lb Flywheel | 4-Way Adjustable Seat |
The new standard in home fitness. Sunny Health & Fitness SF-B1421 Indoor Cycling Bike offers all of the necessities for an amazing cycling workout along with any and everything all at-home fitness enthusiasts could wish for. Exercising in the comfort of your own home has never been so easy, convenient, or fun. Its fully adjustable handlebars and high density padded seat offer a completely customizable experience for ultimate user experience and compatibility.

Features
Digital MonitorTracking your progress on the SF-B1421B is simple with the Digital Monitor screen! Exercising with your SF-B1421B screen display will showcase the distance and time to keep you focused to achieving any type of personal fitness goals. The convenient scan mode displays your progress to assist you in tracking all your fitness goals.

30 LB FLYWHEEL
The heavier the flywheel, the smoother the ride! Creating more momentum for longer periods of time keeps your workout going the distance. Sunny Health and Fitness' flywheel is second to none when it comes to feeling like you are really riding outdoors! No more jerky, out of control movements, regardless of speed or resistance level!

Micro-Adjustable Resistance
The resistance system allows for various tension levels allowing you an intense workout thus burning more calories.
Non-Slip Handlebars
Help prevent calluses with Sunny Health & Fitness handlebars. Non-Slip handlebars offer comfort while enduring long rides. These easily adjustable and completely customizable handlebars provide comfort while enduring intense rides.
4-Way Adjustable Seat
With a simple twist of a knob, you can move back and forth (and up / down) so your workout can remain comfortable.
Transportation Wheels
Making the transformation of your home into your own personal fitness studio is effortless with these convenient transport wheels. Simply tilt and roll out for use or away for storage, no need for heavy lifting or muscle strain. The wheels at the front of the unit allow the user to move their bike around with ease, from room to room, or store it away out of sight.

FITTING & ADJUSTMENTS
The seat can be adjusted for height and proximity to handlebars for setting up your cycle bike, sizing and fitting.
• Adjustable Seat to Handlebar Distance: Min 17.5 in / Max 22 in
• Max User Leg Inseam: Min 26.5 in / Max 37 in

DIMENSIONS
• 45.75L x 20.5W x 49.75H inches
• Max Weight Capacity: 265 lbs

Specifications
TECHNOLOGY
Monitor• time
• speed
• distance
• calorie
• scan
30 lb chromed solid flywheel for stability
Micro-adjustable resistance system
Caged foot pedals
Smooth and reliable belt drive system
COMFORT
Cushioned seatSeat dimensions: 10.5L x 10W x 2.5H in
Easy 4-way adjustable seat
2-way adjustable handlebars
Integrated transportation wheels for easy mobility
Bottle Holder
ENGINEERING
265 lb weight capacityFelt pad resistance system
Heavy duty crank system
Adjustable inseam height: Min 26.5"/ Max 37"
Seat to handlebar distance: Min 17.5 in/ Max 22 in
CONVENIENCE
Warranty: 3 year structural frame 180 days other parts and componentsProduct weight: 93.4 lb
Product dimensions: 45.75L x 20.5W x 49.75H in
Ship weight: 93.4 lb
Ship dimensions: 41.7L x 8.7W x 34.7H in


FAQs
How do I get a copy of the owner's manual?The Product Manual may be downloaded above. If you have any questions, please feel free to contact our customer care team.
Does the bike provide feedback during my workout?
The digital monitor helps track time, speed, distance, calorie, with a scan mode.
Is the resistance in levels or continuous scale?
This bike comes with a micro-adjustable resistance knob so that even the slightest increase or decrease in resistance are smooth and customizable.
Is the bike adjustable so that I can find a setting that feels comfortable to me?
Yes! The handlebars are 2-way adjustable (up and down) and the seat is 4-way adjustable (up, down, forward, backwards) for a fully customizable fit.
What are the benefits of belt-drive mechanism?
The durable belt drive provides smoother and silent pedaling and requires less maintenance.
What is the benefit of a felt pad friction resistance?
The resistance you’ll feel with contact resistance is incredibly strong. A felt pad is used to apply pressure to the flywheel through varying degrees of contact. The resistance can be adjusted by twisting a micro-tension knob.
What is the maximum weight the bike will support?
Feel confident sitting on our durable design with a 265LB max user weight limit.
Am I too tall or short for this bike?
This bike can accommodate inseams between 26.5" and 37".
What are the major differences between the SF-B1421B and SF-B1421? What are the pros and cons of these distinctions?
The main difference is that The SF-B1421 has a chain drive system and the SF-B1421B has a belt drive system. A belt drive system has a belt that connects the pedals to the wheels for a smooth ride. A chain drive system uses a chain to connect the wheels to the pedals.
How do I keep my product in top working condition?
User manuals have recommended maintenance for your equipment. Manuals can be downloaded from our website on each product page, please search for your product to visit the product page.
How do I buy parts?
Contact our customer service team here for parts and technical assistance.
What is the warranty of my indoor cycle?
There is a 3-year warranty on the structural frame and 180-day warranty on other parts and components.

Due to national shipping delays, order delivery times may be impacted.
Please click here to read more about the NATIONWIDE SHIPPING DELAYS
Please contact us directly for an exact ETA of your delivery. Most of our products have a regular handling time between 3-5 business days Please allow 3-15 business days for delivery.
Freight Orders Include FREE Delivery Appointment.
Some of our heavier machines require more customization and are made-to-order in our supplier’s manufacturing plants in United States. Once completed, they are carefully
inspected at the Quality Center, after which they are shipped using freight shipping carriers.
We know that sometimes you have to wait a little longer to get your order but it's always worth it!
Please click here to read more about our Order Shipping & Delivery.
![]() |
Exchanges for damages: Please inspect the packaging of your item(s) when they arrive, if you notice any damage you should make note of it when signing for delivery. If your item(s) do arrived damaged, please send photos to info@barbellflex.com and we will process an insurance claim on your behalf. Be advised that most of our suppliers request you (the buyer) to pay for shipping the item back to them for inspection for damaged returns or replacements. In some cases, we are able to waive the fee, however this is at the discretion of our supplier and on a one-time courtesy basis. The time it takes for your exchanged product to reach you will largely vary on your location. Should the item you return be over $75, we strongly encourage you to use a trackable shipping service with signature or shipping insurance! Note that we will not be able to provide replacements/refunds without photos of the damage. |
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Returns & Refunds: All new products purchased through BarbellFlex.com include a 30 Day Return Guarantee. Refunds will only be issued to the original credit card that you use when placing your order. Please click here to read more about our Returns & Exchanges. |
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We Put Our Customers First! Customer experience is our #1 priority. We understand that these products are available on other websites and we are very appreciative that you chose to do business with us. As such, we pride ourselves in providing a superior concierge sales and shopping experience to all of our customers, via email, phone, social media and live chat.
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Returns are easy, simply contact us to request a return for your item and we will work with you to get the process going. We'll get you a replacement or refund in a snap! Please check our Returns & Exchanges tab for more info! |
|
![]() |
In the unlikely event that you find your item cheaper at another online store, just let us know and we'll beat the competitor's pricing hands-down. Our 100% Price Guarantee has some limitations. Please click here to read more about our Price Match Guarantee. |
|
![]() |
We thank you for your incredible service!. With gratitude, we partnered with GovX to offer a discount on our store to our military, their spouses & dependents, first responders, government employees and our wonderful teachers. Please click here to read more about our GovX ID Military Discount. |
|
![]() |
Ordering from Barbell Flex is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either. We invested time and money to ensure our backend system is secure and robust. We care about your information as much as you do! |
Product Overview
![]() |
![]() |
Digital Monitor | Micro-Adjustable Resistance |
![]() |
![]() |
30 lb Flywheel | 4-Way Adjustable Seat |
The new standard in home fitness. Sunny Health & Fitness SF-B1421 Indoor Cycling Bike offers all of the necessities for an amazing cycling workout along with any and everything all at-home fitness enthusiasts could wish for. Exercising in the comfort of your own home has never been so easy, convenient, or fun. Its fully adjustable handlebars and high density padded seat offer a completely customizable experience for ultimate user experience and compatibility.

Features
Digital MonitorTracking your progress on the SF-B1421B is simple with the Digital Monitor screen! Exercising with your SF-B1421B screen display will showcase the distance and time to keep you focused to achieving any type of personal fitness goals. The convenient scan mode displays your progress to assist you in tracking all your fitness goals.

30 LB FLYWHEEL
The heavier the flywheel, the smoother the ride! Creating more momentum for longer periods of time keeps your workout going the distance. Sunny Health and Fitness' flywheel is second to none when it comes to feeling like you are really riding outdoors! No more jerky, out of control movements, regardless of speed or resistance level!

Micro-Adjustable Resistance
The resistance system allows for various tension levels allowing you an intense workout thus burning more calories.
Non-Slip Handlebars
Help prevent calluses with Sunny Health & Fitness handlebars. Non-Slip handlebars offer comfort while enduring long rides. These easily adjustable and completely customizable handlebars provide comfort while enduring intense rides.
4-Way Adjustable Seat
With a simple twist of a knob, you can move back and forth (and up / down) so your workout can remain comfortable.
Transportation Wheels
Making the transformation of your home into your own personal fitness studio is effortless with these convenient transport wheels. Simply tilt and roll out for use or away for storage, no need for heavy lifting or muscle strain. The wheels at the front of the unit allow the user to move their bike around with ease, from room to room, or store it away out of sight.

FITTING & ADJUSTMENTS
The seat can be adjusted for height and proximity to handlebars for setting up your cycle bike, sizing and fitting.
• Adjustable Seat to Handlebar Distance: Min 17.5 in / Max 22 in
• Max User Leg Inseam: Min 26.5 in / Max 37 in

DIMENSIONS
• 45.75L x 20.5W x 49.75H inches
• Max Weight Capacity: 265 lbs

Specifications
TECHNOLOGY
Monitor• time
• speed
• distance
• calorie
• scan
30 lb chromed solid flywheel for stability
Micro-adjustable resistance system
Caged foot pedals
Smooth and reliable belt drive system
COMFORT
Cushioned seatSeat dimensions: 10.5L x 10W x 2.5H in
Easy 4-way adjustable seat
2-way adjustable handlebars
Integrated transportation wheels for easy mobility
Bottle Holder
ENGINEERING
265 lb weight capacityFelt pad resistance system
Heavy duty crank system
Adjustable inseam height: Min 26.5"/ Max 37"
Seat to handlebar distance: Min 17.5 in/ Max 22 in
CONVENIENCE
Warranty: 3 year structural frame 180 days other parts and componentsProduct weight: 93.4 lb
Product dimensions: 45.75L x 20.5W x 49.75H in
Ship weight: 93.4 lb
Ship dimensions: 41.7L x 8.7W x 34.7H in


FAQs
How do I get a copy of the owner's manual?The Product Manual may be downloaded above. If you have any questions, please feel free to contact our customer care team.
Does the bike provide feedback during my workout?
The digital monitor helps track time, speed, distance, calorie, with a scan mode.
Is the resistance in levels or continuous scale?
This bike comes with a micro-adjustable resistance knob so that even the slightest increase or decrease in resistance are smooth and customizable.
Is the bike adjustable so that I can find a setting that feels comfortable to me?
Yes! The handlebars are 2-way adjustable (up and down) and the seat is 4-way adjustable (up, down, forward, backwards) for a fully customizable fit.
What are the benefits of belt-drive mechanism?
The durable belt drive provides smoother and silent pedaling and requires less maintenance.
What is the benefit of a felt pad friction resistance?
The resistance you’ll feel with contact resistance is incredibly strong. A felt pad is used to apply pressure to the flywheel through varying degrees of contact. The resistance can be adjusted by twisting a micro-tension knob.
What is the maximum weight the bike will support?
Feel confident sitting on our durable design with a 265LB max user weight limit.
Am I too tall or short for this bike?
This bike can accommodate inseams between 26.5" and 37".
What are the major differences between the SF-B1421B and SF-B1421? What are the pros and cons of these distinctions?
The main difference is that The SF-B1421 has a chain drive system and the SF-B1421B has a belt drive system. A belt drive system has a belt that connects the pedals to the wheels for a smooth ride. A chain drive system uses a chain to connect the wheels to the pedals.
How do I keep my product in top working condition?
User manuals have recommended maintenance for your equipment. Manuals can be downloaded from our website on each product page, please search for your product to visit the product page.
How do I buy parts?
Contact our customer service team here for parts and technical assistance.
What is the warranty of my indoor cycle?
There is a 3-year warranty on the structural frame and 180-day warranty on other parts and components.

Due to national shipping delays, order delivery times may be impacted.
Please click here to read more about the NATIONWIDE SHIPPING DELAYS
Please contact us directly for an exact ETA of your delivery. Most of our products have a regular handling time between 3-5 business days Please allow 3-15 business days for delivery.
Freight Orders Include FREE Delivery Appointment.
Some of our heavier machines require more customization and are made-to-order in our supplier’s manufacturing plants in United States. Once completed, they are carefully
inspected at the Quality Center, after which they are shipped using freight shipping carriers.
We know that sometimes you have to wait a little longer to get your order but it's always worth it!
Please click here to read more about our Order Shipping & Delivery.
![]() |
Exchanges for damages: Please inspect the packaging of your item(s) when they arrive, if you notice any damage you should make note of it when signing for delivery. If your item(s) do arrived damaged, please send photos to info@barbellflex.com and we will process an insurance claim on your behalf. Be advised that most of our suppliers request you (the buyer) to pay for shipping the item back to them for inspection for damaged returns or replacements. In some cases, we are able to waive the fee, however this is at the discretion of our supplier and on a one-time courtesy basis. The time it takes for your exchanged product to reach you will largely vary on your location. Should the item you return be over $75, we strongly encourage you to use a trackable shipping service with signature or shipping insurance! Note that we will not be able to provide replacements/refunds without photos of the damage. |
|
![]() |
Returns & Refunds: All new products purchased through BarbellFlex.com include a 30 Day Return Guarantee. Refunds will only be issued to the original credit card that you use when placing your order. Please click here to read more about our Returns & Exchanges. |
![]() |
We Put Our Customers First! Customer experience is our #1 priority. We understand that these products are available on other websites and we are very appreciative that you chose to do business with us. As such, we pride ourselves in providing a superior concierge sales and shopping experience to all of our customers, via email, phone, social media and live chat.
|
|
![]() |
Returns are easy, simply contact us to request a return for your item and we will work with you to get the process going. We'll get you a replacement or refund in a snap! Please check our Returns & Exchanges tab for more info! |
|
![]() |
In the unlikely event that you find your item cheaper at another online store, just let us know and we'll beat the competitor's pricing hands-down. Our 100% Price Guarantee has some limitations. Please click here to read more about our Price Match Guarantee. |
|
![]() |
We thank you for your incredible service!. With gratitude, we partnered with GovX to offer a discount on our store to our military, their spouses & dependents, first responders, government employees and our wonderful teachers. Please click here to read more about our GovX ID Military Discount. |
|
![]() |
Ordering from Barbell Flex is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either. We invested time and money to ensure our backend system is secure and robust. We care about your information as much as you do! |