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  • USA-made, direct-drive bike trainer eliminates tire-to-roller contact, and is capable of replicating any outdoor ride, from spinning to rolling hills to 20%-grade Tour climbs
  • All of this is done with a smooth, roadlike feel thanks to a massive 20 lb. precision-balanced flywheel that replicates real world inertia
  • The flywheel is paired with the innovative, rapid-response CycleOps electromagnetic resistance system to create nothing louder than 64 decibels
  • Noise level at 20 MPH is 64 decibels, which is quiet enough to ride in a library
  • Fast response electromagnetic resistance ensures the most responsive resistance and maximum power available
  • Add a cassette, pop off your rear wheel, connect to your favorite virtual training software and prepare to Hammer away (cassette and software not included)
  • Compatible with a wide variety of devices and virtual training applications, including CycleOps VirtualTraining, Zwift, TrainerRoad and many more (software not included)
  • Integrated dual ANT+ FE-C and Bluetooth 4.0 technologies
  • Axle compatibility gives you the freedom to choose any thru-axle or quick-release bike now and for years to come
  • Thru-axle compatible for bike frames with fork widths of 142mm or 148mm
  • Quick-release compatible for bike frames with fork widths of 130mm or 135mm
  • Robust design is capable of handling up to 2,000 watts at 20 MPH and can simulate up to a 20% climbing grade
  • Direct-drive design connects bicycle directly to resistance unit, eliminating tire wear
  • Internally cooling technology ensures accurate ride data even during the hardest of workouts
  • Integrated front wheel tray adds stability to ride and nests within the trainer when not in use
  • Folding legs provide the widest footprint of direct-drive indoor bicycle trainers on the market for added stability and easy storage
  • Includes a Shimano splined free hub for compatibility with Shimano 8- to 11-speed cassettes
  • Accessible and balanced handle allows for smooth, anyone-can-carry transit of the trainer
  • Over-the-air (OTA) firmware updates via Bluetooth 4.0 devices ensure the Hammer is up to date
  • 300 lb. (136kg) maximum load, excluding bicycle
  • Cassette not included
  • Weighs in at 47 lbs. (21.3 kg)
  • Made in Madison, WI

Made in USA.

View all CycleOps Bike Resistance Trainers

REI membership


Best Use Cycling
Resistance Type Magnet
Dimensions Open: 31 x 19.5 x 18.5; folded: 19.5 x 18.5 x 3 inches
Foldable Yes
Software Controlled Yes
Weight 47 pounds
Rated 4 out of 5 by from Great trainer Great overall direct-drive smart trainer. Had some issues with BT connectivity and another COs training software. Was told by Cycleops that trainer not supported by BT but issues have since passed and it pairs fine. During one training session the resistance dropped and a red light displayed on the Hammer. I unplugged the power and turned it on again. This time it took 700 W to start moving pedals. Luckily end of workout. Seems like communication issue. Those are just some small issues. The trainer has worked fine with BT workouts using CVT and other software. Would be nice to have power-matching ability where CVT reads power monitor output and then regulates trainer to get to target. P1 Pedals as an example. Happy I bought it.
Date published: 2017-02-05
Rated 5 out of 5 by from Worth the Wait Purchased to primarily ride on Zwift. I upgraded from a Tacx Vortex Smart wheel on trainer. Purchased Cycleops to purchase from a US based company where I could get local support! First of all it comes with the spacer for 8-10 speed Shimano cassette's which is handy. The trainer comes with a couple of different axle setups, but was ready for a 130mm out of the box, which is what I needed. The quality of the retractable legs was good. The setup was very easy - added my ten speed cassette to the trainer, plugged it in, and Zwift saw it. I got lucky and didn't have to tune my rear derailleur. I started riding and was happy with the result. First of all the trainer was super stable and didn't rock, but allowed enough flex for a natural feel. The power resistance change was smoother than anything else I have ever used. The large fly wheel keeps you rolling and helps smooth things out as well. The trainer isn't too loud, which allowed me to better hear my music. I hit a 10% grade and watched my heart rate rise!
Date published: 2016-12-10
Rated 5 out of 5 by from Hammer Time! I am an avid mountain biker and I was looking for a way to maintain and improve my fitness level in the off-season. I also want to be able to log more miles during the week as I am only typically able to get out for a ride on Saturdays. With advances in smart trainers and software training programs such as Zwift and Trainer Road it is truly amazing what the CycleOps Hammer can do when paired to them. I had no idea how awesome it would be to ride a trainer and I don't even like riding on the road (sorry roadie friends)! The dynamic resistance has been impressive to say the least and I'm now learning all about watts and FTP to improve my fitness level. It's awesome! I specifically purchased the CycleOps Hammer after researching several competitor products due to it's extremely versatile ability to connect to just about any bike you have. 1) Remember to remove the rubber band from the hub on the trainer if installing any non 11 speed cassette. It is holding a spacer in place and failing to remove it will result in harsh shifting. Remove the spacer if connecting an 11 speed cassette. 2) You can connect a SRAM 1x11 mountain bike if you use the SRAM PG-1130 cassette as it is compatible with an 11 speed Shimano hub - awesome! I can now use my modern mountain bike which is fantastic! 3) If you plan to connect the trainer to a PC you will have to buy an ant+ dongle which connects via USB. A lot of the software providers are making native apps on tablets and smart phones so these devices do not need ant+. 4) A fan is essential to help mitigate the sweat - just trust me on this one! I highly recommend the CycleOps Hammer smart trainer to anyone looking. It's priced well, you can connect the bike you ride regularly, and paired with software the indoor training experience is far better than I ever thought it could be.
Date published: 2016-12-15
Rated 5 out of 5 by from Best Indoor Training Experience I've Ever Had Perfect for coaching athletes in my home office and for my own personal training. I have always been a fan of indoor training on the bike, but the CycleOps Hammer has taken my training and coaching to the next level. It even got my wife back on the bike and she's now stronger than ever! The easy pairing with devices and third party apps like Zwift and Trainer Road make set up very simple, and once you are riding, the 20kg flywheel gives a great road like feel. It also has very responsive and accurate power readings which make it great for testing, controlled intervals and simulated hill climbing.
Date published: 2017-04-15
Rated 5 out of 5 by from Hammer Time! Super easy to set-up, was up and running 10 minutes after unboxing it. Have been using it with Zwift and it makes for a much more dynamic experience. Also much quieter than a standard trainer - especially at higher intensities.
Date published: 2017-01-25
Rated 3 out of 5 by from Trainer has "new-product issues" The trainer is not yet supported by Trainer Road, but CycleOps indicates that the trainer is compatible. I wasted a lot of time with this because the Trainer Road calibration was not working right, and when I finally called Trainer Road, they said it was not supported. Trainer Road is working on support right now. The trainer does work with the Virtual Training APP that is provided by CycleOps. I did connect it for a test, and it did work. However the power output numbers seemed a bit erratic +/- 15 W from target power. I also had an issue with how the spacer caps were installed in the rear hub. Cycleops apparently installed the non-drive side cap on the drive side. Thus, I could not install the cassette. Cycleops customer service was not helpful, but this may be due to lack of experience with the trainer since it is new. I returned the product.
Date published: 2017-01-03
Rated 5 out of 5 by from Great machine My first smart trainer and chose the Hammer over the Kickr based on reviews of both. It's pretty quiet, but I don't live in an apartment, so it's not and issue. I've read the Kickr can be loud. The set up is easy and found that it "likes" the ANT+ connection better that Bluetooth when it comes to my PC. Just my experience. It talked to my iPad via Bluetooth without a problem. The road feel is pretty good, but there is no such thing a coasting downhill! The resistance eases up, but you still have to pedal. Just the way it is. It comes with a bunch of training profiles and video rides. Just rode around a section of Iceland the other day. Pretty cool. I'll follow up with more as I ride it more. My primary reason for buying it was to do hill work and intervals.
Date published: 2017-04-05
Rated 3 out of 5 by from Good, but could be better I have two complaints. When a trainer costs this much money, but requires a special BT adapter, just include it, or at the very least make it crystal clear that it's needed at time of purchase. Second, I'd prefer the endcaps had a knurled face to give a better bite into the dropouts. After intense intervals, I am always finding that the bike has moved on the trainer, if it were to dislodge during one of the efforts it would be BAD. I'm using a Shimano XT skewer clamped very tight so it's not the fault of a cheap QR.
Date published: 2017-04-10
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All of my bikes are campy, i have a 9 speed , 10 speed, and 11 speed cassette. What will i need to do (if anything) to make this trainer compatible with campy?

Asked by: cdrivers
​Out of the box this trainer is compatible with an 11-speed Campagnolo cassette. If you want to run a 9-speed or 10-speed Campagnolo cassette you need a Campagnolo specific cassette spacer.
Answered by: REIservice
Date published: 2017-03-29

Keep seeing 20MPH as a Benchmark on the description ie... decimal level and 2k max wattage @20MPH. I assume the trainer can exceed 20MPH, correct?

Asked by: papis408
Yes, the trainer can exceed 20MPH. There is no specific limit for speed.
Answered by: REIservice
Date published: 2016-12-06

Can you confirm that this trainer is compatible with the 148mm Boost rear axle MTB standard?

Asked by: ibcoleman
​This trainer is compatible with a 148mm thru axle.
Answered by: REIservice
Date published: 2017-02-28

When will it be ready for delivery? 

Asked by: Iasocorona
Please call us for availability.
Answered by: REIservice
Date published: 2016-12-14

What bikes do you recommend for this trainer? I would like to spend less than $700.00

Asked by: Throwbacks818
Please give us a call at 1-800-426-4840. We'd be happy to assist in selecting a bike.
Answered by: REIservice
Date published: 2016-12-20
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