Discover everything about CAROL in our Ultimate CAROL Bike Resource. VIEW NOW.


Your questions. Answered.

If you can’t find the answer to your question — email us at  [email protected].

What are the key features of CAROL Bike?

CAROL is the smartest, most effective exercise bike—with workouts backed by science. CAROL Bike learns to push you to your limit. With AI-personalization that instantly applies your optimal resistance. And a range of workouts scientifically-proven to be the shortest, most effective. Find out more about CAROL Bike here.


What does the AI do?

CAROL Bike uses AI to personalize your workouts, which helps you reach your fitness goals more quickly. CAROL’s AI is able to calculate the precise resistance that will push you to your personal limits, but never going over. Over time, CAROL’s AI continues to adapt as your fitness improves, so you’re always working to your maximum potential.


What are the benefits of CAROL Bike?

Research shows that with just 3×5-minute sessions a week, you can expect to:

  • Improve your VO2max by 12% —in just 8 weeks
  • Reduce your risk of type 2 diabetes by 62%—and blood pressure by 5%
  • Burn more calories on a 15-minute CAROL ride than a 30-minute run

Find out more here.


Can anyone ride CAROL Bike?

To ensure your safety, the rider requirements are:

  • Height: 4’7″ – 6’7″ / 140 cm – 200 cm
  • Max weight: 330 lbs / 150 kg

It is mainly for users 18+, but children can use the bike, too, as long as they’re tall enough to ride. Our guidance is that children 10+ can use the bike, with adult supervision, keeping in mind the recommendation is 60 minutes of exercise per week.

As with all exercise, riders with pre-existing health conditions or who are
pregnant should get medical clearance from their GP.


How big is the bike?

CAROL Bike is designed to fit seamlessly into your home, with a footprint of 45.5″ x 22″ / 116cm x 56cm. Based on this we recommend allowing a space of 46″ x 46″ / 116cm x 116cm for the bike, plus an additional 22″ / 56cm to one side so that you can embark/disembark easily.


How much does the bike weigh?

CAROL Bike’s durable design is built to last, weighing 120lb / 54.5kg. It is a fully commercial-grade exercise bike, built to withstand frequent use. With a heavy-duty, powder-coated steel frame, forged steel crank arms, composite flywheel with steel core and brushed aluminum outer ring.


Can I link other streaming services to my CAROL Bike?

You can connect to apps like Peloton, Zwift, YouTube, Netflix and more. You can also pair with Apple Watch via Heartcast.


How does CAROL Bike work?

CAROL Bike was developed with leading exercise researchers to deliver the shortest, most effective workouts. Our signature REHIT workout creates the
most potent training stimulus with just 2×20-second sprints. It’s scientifically proven to deliver superior health and fitness benefits compared to normal exercise—in 90% less time.


What is REHIT?

Reduced Exertion HIIT (REHIT) is an optimized form of High Intensity Interval Training (HIIT) that’s more effective than conventional exercise — with a much shorter time commitment. This helps you achieve maximum fitness in the minimum time.

CAROL is the only fitness equipment that makes it possible to do REHIT workouts at home. Find out more about the science of REHIT here.


Is CAROL Bike good for beginners?

CAROL Bike is for all exercise levels based on adaptive AI technology. The bike will push you based on your current fitness level, so you can get the most out of the workout. It doesn’t matter if you’ve never worked out, haven’t worked out in 2 years, or workout every day. The bike will adapt to your level and push you to your max. The bike will continue to learn and ensure you are always getting a good workout.


Is CAROL Bike safe?

Yes, CAROL Bike is designed to make it completely safe for you to achieve optimal fitness at home. Here’s how:

  • CAROL Bike comes with built-in safety algorithms, as well as a heart rate monitor, that will warn you — or even abort a ride — if anything abnormal is detected with your heart rate.
  • CAROL’s workouts have been carefully designed and tested to give you enough time to recover.
  • CAROL Bike is a commercial-grade bike that is strong enough to withstand the high forces of maximum intensity workouts, and the freewheel clutch lets you safely perform explosive sprints.

How do you measure performance and progress with CAROL?

Your CAROL Bike comes with a personalized dashboard with comprehensive performance metrics like your Fitness Score; so you can accurately track how your fitness is improving.

It also comes with a heart rate monitor to track your performance more accurately—capturing R-R intervals (small changes in the intervals between successive heartbeats) for HRV (heart rate variability) measurement.


What does CAROL Bike stand for?

CAROL stands for Cardiovascular Optimization Logic – our method to optimize and personalize cardio workouts, to make every moment mean more.


How much does CAROL Bike cost?

CAROL Bike starts at $2,595.


Does the bike come with any accessories?

Your CAROL Bike comes with a bottle holder and heart rate monitor that seamlessly connects to your bike for a more accurate way to track your

You can also purchase supporting accessories with your bike, including a phone holder designed to keep you connected to the outside world while you workout, and a high-spec PVC bike mat, designed to protect your floor while you pedal.


Where can I geek out on the science?

We thought you’d never ask. Head to our science page to read the research that proves CAROL Bike provides the most effective, efficient workout ever.

Do I need a membership to use CAROL Bike?

Yes, with a membership you’ll unlock all the features of your CAROL Bike, including AI-personalized workouts, with instant resistance for maximum results.

Without a membership you do still have access to valuable features, including non-personalized resistance settings, standalone performance metrics and six
science-backed workouts.


What is included in my CAROL membership?

One CAROL membership unlocks new science-based workouts, AI-personalized resistance and detailed performance metrics for your entire household. Find your full list of member benefits here.


What is the membership price?

Prices are detailed by territory below:

United States
$19.99/mo (excl. sales tax)
$24.99/mo (excl. sales tax)
United Kingdom
£19.99/mo (incl. sales tax)
European Union
€22.99/mo (incl. sales
£499/lifetime (excl. sales

For commercial memberships, you can contact our dedicated sales team here for a bespoke plan.


What are my payment options?

You can pay monthly on your bike using your credit or debit card. Manage your payment method any time by tapping Profile > Preferences.


When does my membership start?

Your membership starts when you sign up and create your profile on your bike.


How do I know when to pay for my membership?

When you set up your bike you will be prompted to start your membership. Payments will be taken automatically on a monthly basis.

Manage your membership any time by tapping Profile > Preferences.


How many profiles can I have under one membership?

Your membership can be enjoyed by up to eight riders, meaning your family and friends get personalized rides too.


Can I pause and/or cancel my membership?

You can cancel your membership at any time by tapping Profile > Preferences. Sadly you cannot pause your membership, but you can always cancel and then reactivate it at any time.


I’ve changed my credit card info. How do I update this on the app?

You can remove your old card and add your new one by tapping Profile > Preferences > Manage.


I represent a gym/studio. What kind of membership do we need?

You need a commercial membership. Commercial membership tiers start at 24 riders and are priced from £49/month.

Commercial membership includes all the features outlined above, plus:

  • Additional user profiles
  • Dedicated customer success manager
  • Warranty covering commercial use
  • Software features for commercial use (e.g. gym dashboard, big-screen,
    leaderboard, booking system)
  • Marketing support providing creative and educational assets
  • Option to participate in referral incentive scheme

Can I try CAROL Bike before purchasing?

Yes, you can try CAROL Bike for yourself before you buy, at over 30 studios around the world. Find your nearest location here.

Don’t forget you can also enjoy a 100-day home trial, making purchasing your CAROL Bike entirely risk-free.


Where do you ship?

CAROL ships to most countries worldwide, meaning that no matter where you are, you can own the bike that gets you fittest, fastest.

Contact Customer Support if you’re unsure whether CAROL delivers to your region.


How long will delivery take?

Delivery times depend on location and whether or not you want us to assemble the bike for you.

The timeframes in the table below refer to the time it will take for your bike to be delivered to your local delivery depot. Once your bike reaches the depot, you will be telephoned by the courier to schedule a delivery window that suits you – usually between 1-3 days, or 2-4 days for pre-assembled bikes.

Delivery estimate
Mainland US
4-5 weeks.
Mainland Canada
4-6 weeks.
8-10 weeks.
8-10 weeks.
Please contact Customer Support for an accurate quote.

These timelines are estimates only and could be subject to change. Once we’ve shipped your bike, you’ll get a tracking email, so you can stay up to date on your bike’s delivery status.


How much does shipping cost?

If you live in the mainland US, Canada or UK, you can get your new CAROL Bike delivered boxed to your front door for free.

Here’s a full breakdown of shipping costs:

Shipping cost
Mainland US
Alaska and Hawaii
Mainland Canada
Newfoundland and
Northwest Territories, Nunavut
and Yukon
Mainland UK
From £249
Your shipping cost will be calculated at checkout. Alternatively, contact
Customer Support
to get a personalized quote.

Will I be charged duties and taxes?

If you live in the mainland US, Canada or UK, you will not need to pay additional duties or taxes on your order.

If you live outside of these countries, you might need to pay additional duties or taxes. These will be calculated and collected by DHL before they deliver your bike. Find more information on their duties and taxes policy here.


How do I track my order?

You’ll receive an email with tracking information as soon as your bike has shipped – usually within 1-2 business days from placing your order.


Can I cancel or modify my order?

If, for whatever reason, you need to make changes to your order, contact Customer Support as quickly as possible after placing your order, and they will do their best to assist you. Please note that you are unable to amend your order after it has shipped.

What is the assembly process like?

We want to make it as easy as possible for you to make a start, which is why we offer both DIY and Paid Assembly.

DIY Assembly: with just 7-steps and customer support on-hand— assembling CAROL yourself is simple, and should take no more than 50 minutes. You can watch the assembly video here and download a copy of our self-assembly user guide here.

Please note that the bike is heavy (120lb / 54.5kg), so we recommend assembling with two people, and that you do not attempt to lift it by yourself. There are wheels on the rear stabilizers that you can use to maneuver the bike. The rear of the bike is where most of the weight is, so take care when attempting to lift it.

Paid Assembly: if you live in the mainland US or UK, you can choose for us to deliver your bike fully assembled – and ready to ride, for a small fee.


How much extra do I have to pay for pre-assembly?

Pre-assembly is offered in the mainland US and UK. You will get your bike delivered to room of choice fully assembled.

Depending on which region you are in, the price varies:

Pre-assembly cost

What is the profile set-up process like?

Setting up your profile on the bike is simple: plug it in, connect to Wifi and follow the instructions on-screen.

What is your 100-day home trial offer?

You can return your CAROL Bike, no questions asked, within 100 days from delivery.

If you live in the mainland US, mainland Canada or UK it is free to return your bike and you will be issued a full refund.

Who is the 100-day home trial for?

The trial is for anyone who wants to experience the benefits of CAROL Bike at home, with no strings attached. The trial period is eligible for home users only and limited to one per customer.

When does my 100-day home trial start?

Your trial starts on the day that your bike is delivered.

Do I have to pay before my 100-day home trial?

Yes, you pay for your bike at checkout. If you choose to return your bike within your 100-day free trial, you will be issued a full refund if you live in mainland US, mainland Canada or UK. For all other regions you will be refunded for your bike, minus any original and return shipping fees.

Are all countries eligible for the 100-day home trial?

Yes, we want to give everyone the opportunity to experience CAROL Bike, which is why we offer our 100-day home trial to all locations. Please note that outside mainland US, mainland Canada or UK, you will be refunded for your bike minus original and return shipping fees, if you choose to return your bike after your trial period is over. You can also try CAROL bike for yourself before you buy, at over 30 studios around the world. Find your nearest location here.

Do I need to keep any of the packaging or boxes?

If you decide to return your CAROL Bike, you will need to return it in its original packaging. So, if you’re unsure, we’d recommend keeping the packaging for the duration of your trial.

What is the CAROL returns policy?

CAROL offers a 100-day home trial, no questions asked. If, for whatever reason, your CAROL Bike isn’t for you, we’re happy to refund you and take back your bike.

This return service is free of charge if you live in the mainland US, Canada or UK. For all other regions you will be refunded for your bike, minus your original shipping cost and the return shipping cost.

From 100 days after the date of delivery, you will not be able to return your bike or request a refund.

Once your bike has been collected by the carrier, it will be sent back to our
warehouse for inspection. The inspection covers the operation of the bike as well as a walkthrough for any damages. As long as the bike is operational and only shows signs of minimal wear and tear, a full refund will be issued.


How do I return my CAROL Bike?

Arranging a return is easy, simply contact Customer Support and a member of the team will organize this for you.

We ask that you please return your bike in its original packaging.


Do I need to pay a return shipping fee?

If you live in the mainland US, Canada or UK it is free to return your bike. For all other regions, you will need to cover the return shipping cost, which will equal your original shipping cost.


Are shipping charges refundable?

If you live in the mainland US, Canada or UK, you will receive a full refund, including charges paid for shipping and assembly of the bike, if applicable.

For all other regions you will receive a refund for the bike, as well as any charges paid for assembly of the bike, but minus any original or return shipping


How long does it take for a return to be processed?

Once your return request has been approved, a carrier will reach out to you within 5-7 days to schedule collection of your bike. After the bike has been collected, funds will be refunded to your original payment method within 25 days.


Where is my refund?

If you have not received your refund within the specified timeframe, contact Customer Support and a member of our team will be happy to help.


Can I get a refund if I financed my bike?

Absolutely. If you financed your purchase, Affirm or Klarna will refund your paid installments, less any interest paid.


What warranty coverage do I get with a CAROL Bike purchase?

All bikes come with a 5-year frame warranty and a 1-year component warranty. You have the option to purchase an additional 1-year component warranty for £150 (excl. sales tax) to cover bike components for 2 years.  

Find our full warranty policy here.


I have a warranty claim. What should I do?

To make a claim contact Customer Support, quoting either the email address used at checkout or to create your bike profile, or your order number.

What payment methods do you accept?

You can pay for your bike using all major credit and debit cards, as well as Apple Pay and Google Pay.


Do you offer a financing plan?

Yes, we offer a 0% Finance plan for those in the UK and US. You can pay over 12 months with Klarna in the UK, or Affirm in the US.

Note that we act as a credit broker and not a lender. Financing is subject to a credit check and approval. In cases of partial approval, a down payment may be required.​

Late or missing repayments may have serious consequences and cause serious money problems.


Is my membership included in my monthly payments?

Finance plans cover the bike only, your membership will be billed separately.


When is the first payment due if I have ordered my CAROL Bike with finance?

Once your CAROL Bike order has been confirmed, you will have 30 days to make your first payment.


How much will I pay each month?

You will pay in 12 monthly installments, with 0% APR financing, as follows:


Affirm (US): 12 monthly installments with 0% APR financing. 

12 payments

Klarna (UK): 12 monthly instalments with 0% APR financing .

12 payments

Please note that the repayment terms offered are at the discretion of the lender. Those terms are final and non-negotiable. CAROL cannot influence the terms offered.

You can visit the Affirm or Klarna help centers for more information.

Do you offer commercial memberships?

Absolutely. Commercial membership tiers start at 24 riders and are priced from $39/month.

Commercial membership includes all the features outlined above, plus:

  • Additional user profiles
  • Dedicated customer success manager
  • Warranty covering commercial use
  • Software features for commercial use (e.g. gym dashboard, big-screen leaderboard, booking system)
  • Marketing support providing creative and educational assets
  • Option to participate in referral incentive scheme

How can I purchase a CAROL Bike for commercial use?

For commercial purchases and memberships, you can contact our dedicated sales team here for a bespoke plan.

I have a medical condition. Can I use CAROL Bike?

A safe user experience is of the utmost importance to us.

All users must, prior to carrying out any exercise on CAROL Bike, complete this short Physical Activity Readiness Questionnaire (PARQ, see below) to ensure that the bike is used within the prescribed safety margins:

  • Has your doctor ever said that you have a heart condition and that you should only do physical activity recommended by a doctor?
  • Do you feel pain in your chest when you do physical activity?
  • In the past month, have you had chest pain when you were not doing physical activity?
  • Do you lose your balance because of dizziness, or do you ever lose consciousness?
  • Do you have a bone or joint problem (for example, back, knee or hip) that could be made worse by a change in your physical activity?
  • Is your doctor currently prescribing drugs (for example, water pills) for your blood pressure or heart condition?
  • Do you know of any other reason why you should not do physical activity?

Each CAROL Bike rider is responsible for their own health.

If a rider answers Yes to any of the questions, we request that the rider seeks medical advice from a professional prior to using CAROL.

If a rider feels unwell when using CAROL, they must immediately cease use of CAROL and seek medical advice from a professional.

Can’t see what you’re looking for?

Chat with us or email us anytime at [email protected].

Scroll to Top

8 hacks for optimal fitness

Get your free guide to improve cardio and strength based on Dave Asprey's new book.