QUICK HITS
• 160mm Horst Link Suspension
• Mixed Wheels (29” F / 27.5” R) Only
• Bosch CX Gen 5 Drive Unit
• 100Nm, 750W Peak
WE DIG
WE DON’T
ABOUT THE HARO E GREER CARBON
What is the Haro E Greer Carbon designed to be?
The E Greer Carbon is the latest in the line of Haro eBikes, with 160mm travel and the latest Bosch CX drive unit. It aims to hit the sweet-spot of aggressive descending capabilities with some of Haro’s playful BMX heritage thrown into the mix. With a mixed-wheel setup only, and short chainstays, it’s clear that it’s designed to party on the trails.
What eBike Drive System Does The Haro E Greer Carbon Use?
This is one of the eight bikes in our 2025 eMTB Shootout to use the Bosch Performance Line CX drive unit. Currently this 2.8kg drive unit system produces 85Nm Torque and 600W Peak Power. Riders are able to connect to the system with the Flow app and increase these figures to 100Nm and 750W Peak. The system is charged by the 4A Bosch Charger, taking the battery from empty to full in around 5 hours.
Powering the drive unit is an integrated 600Wh battery, which weighs 6.6lbs (3kg). It is not possible to fit the larger 800Wh battery in the Haro E Greer Carbon, however the capacity can be boosted by 250Wh with the 3.3lbs (1.5kg) PowerMore range extender.
The Bosch Smart System currently utilizes the LED System Controller, which sits nestled within the top tube of the Haro frame. Its LEDs indicate battery life in 10% increments as well as the power mode selected. The Bosch Wireless Mini Remote is fitted to the handlebars, letting you toggle the power mode and use the Walk function.
The Bosch Flow app allows riders to modify the configurations of the power modes; track and lock the bike in case of theft, and record and plan their rides.
Editor’s Note – You’ll notice below the lack of bash guard protecting the Bosch drive unit. Since this bike was is a prototype, that included a 3D-printed prototype bash guard, which was all show and no go. The production guard should be quite a bit more durable.

What are the details of the Haro E Greer Carbon frame?
The Carbon Fiber frame of the Haro E Greer is designed to take a large water bottle within the front triangle, or the Bosch PowerMore Range Extender.
The E Greer is designed around mixed wheels only, with no option to fit a larger 29” wheel in the rear. The geometry is fixed, with no flip chips or adjustability built in – set your suspension, hop on and go. The cables are routed internally, with ports in the side of the head tube.
Haro backs their eMTBs with a lifetime warranty on the front triangle, and five-year warranty on the swingarm.
How much suspension travel does the Haro E Greer Carbon have, and with what linkage?
The Haro Greer features a classic Horst Link suspension system to deliver its 160mm of rear wheel travel. Up front, there’s a 170mm fork.
What are the stand-out geometry figures on the Haro E Greer Carbon?
Haro instilled some of their BMX background in the E Greer, with a short 435mm chainstay length across the size range giving an agile feeling with the 27.5” rear wheel. The rest of the geometry numbers are quite typical of a 2025 enduro eMTB.
What Haro E Greer Carbon build specs are offered?
Haro is offering the E Greer Carbon in three build offerings prices roughly between $7,400 to $11,000. We were provided a prototype frame with a unique paint job and mismatch of components to test as it was all Haro had available at the time. We agreed that the majority of spec components were close enough to those that will be spec’d on production bikes to be acceptable. Our estimated value for this build was in the region of $9,250.
The Haro E Greer Carbon weighed in at 49.0 lbs (22.2kg) for the size Large with the Schwalbe Magic Mary and Albert Radial Gravity control tires fitted.
Hit the spec list at the bottom of the article to learn about the spec of the bike we tested.
THE DIRT
Setting Up the Haro E Greer Carbon | The Haro E Greer Carbon setup process felt like somewhat of a nod to their bmx roots. As it was passed from tester to tester – often in a hurry – we appreciated the wide tuning window and seemingly unfussy nature of the suspension. While more time spent bracketing and honing in on the “perfect” settings to unlock the full capabilities of the rear end is always likely to be beneficial, our crew found that simply setting the sag at a rough 30% on the shaft had the E Greer Carbon ready to rally.
How Did The Bosch Performance Line CX Gen 5 eBike System Perform?
As with the other seven Bosch Gen 5-equipped bikes we had in our 2025 eMTB Shootout, we were impressed by the control and quiet operation of the drive unit. With the update applied and the uprated 750W Peak Power and 100Nm Torque, the Haro had plentiful grunt to hang with all but the DJI-equipped Unno…at least when that bike was working.
More time is required to see how the new EMTB+ mode performs once it lands with consumers. For our initial tests of a beta version, the power and overrun were great…until they weren’t. At times this mode made the system inclined to run away from us at the most crucial moments on ultra-technical climbs. As such, we found ourselves constantly toggling between EMTB and EMTB+ to obtain the characteristics we desired from the motor.
Make no mistake though, outside of the EMTB+ mode, the control of the new Bosch unit is exceptional. It reads your power input with incredible response, leading to less spin-outs and quicker acceleration when it’s needed. Power wheelies around corners and up ledges have never been delivered with such control. Perhaps this contrast made the reduced control of the EMTB+ mode more notable, but even so we’ll be exercising caution with this mode until we know for sure.
The 600Wh battery on the E Greer Carbon will take you a reasonable distance and height, but the capacity is not great. Riders looking to go out for longer rides will want to factor the PowerMore Range Extender price into their purchase, and we’d suggest utilizing the upgraded Peak Power only in times of great need.

How Did The Haro E Greer Carbon Climb?
With a comfortable suspension platform and solid seating position, the Haro was a pleasant bike to climb on. That was until the trail got particularly steep, where the short rear end led to a more difficult time managing traction on both ends. The flip side was moves like climbing up ledges were that little bit easier, thanks to the combination of the reasonable overall weight and the ease of lifting the front end.
Because Haro left the rear end fairly open under pedaling efforts, there’s a healthy amount of traction generated at the rear wheel. Efficiency in lower power modes may not be quite as good as some as a result, but the shock’s lockout lever is in easy reach to assist with that.
Overall, for all but the most demanding steep climbs, the E Greer Carbon was an effective climbing machine.

How Was The Haro E Greer Carbon On The Descents?
It was easy to feel the bmx heritage of the Haro brand on the descents. The short rear end, light overall weight and lively suspension feel all contributed to an eBike that loved to play on the downs. From manualling to slashing to side hits, the Haro provided a good time every time the terrain pointed down.
This came at the expense of out-and-out speed and confidence on more rough and technical descents. By no means was the E Greer Carbon a nervous or poor descender, but favored a slower and more flamboyant riding style over a serious speed-focused approach. We would happily ride the E Greer Carbon down just about anything, but it wouldn’t be our choice to take to the races.
Finish And Value On The Haro E Greer Carbon
Since our Haro test bike was a pre-production machine with a very unique finish, we can’t comment on the final product’s finish with certainty. That said, Haro’s display bikes commanded a solid level of quality in the flesh at Sea Otter Classic this year, so we don’t imagine the E Greer Carbon to be lacking.
You will notice the lack of bash guard in the images. The bash on the bike we were supplied was a 3D printed prototype and certainly didn’t have the level of resilience we’d expect of the final product. It only took a couple of minor impacts for our test bike to lose its protection, but we can forgive Haro in this case.
We were a little surprised by the price range of the E Greer bikes, spanning an estimated $7,400 to $11,000. We had incorrectly assumed that these Haro eBikes would come in at an impressive price point, however the price tags put them decidedly in the premium space. It’s important to consider that it’s a quality carbon frame and the two higher build specs feature carbon fiber wheels too, but even so they don’t quite feel like steals.
The Wolf’s Last Word
The Haro E Greer Carbon provided a seriously fun and playful ride, without robbing all capability and comfort for more rough and technical trails. Carrying the air of freestyle bmx over to the mountains, Haro did a stellar job with these eMTBs, but you’ve got to pay for the privilege.
Who Is The Ideal Haro E Greer Carbon Rider?
We could see bmx riders making the transition over to e-mountain biking finding value in the bmx heritage and playful feeling of this Haro. Riders who are less focused on the clock and more on logging air miles and playing on the back wheel are going to benefit the most, but the E Greer will still have their back on more technical and rowdy descents thanks to its effective suspension and geometry.
Price: $9,250 (estimated)
Website: harobikes.com
About The Pack
During the production of our 2025 eMTB Shootout, we had the Ari Timp Peak 2.0 tested under 8 different riders and compared to the other 11 bikes. The Loam Wolf crew spans heights from 5’10” to 6’2” (177cm to 189cm), and weights from 160lbs to 220lbs. For this year’s test, we also included one of our supporting members, Leonard Johnston from Indiana. His “real world eMTBer” insight was invaluable to us as we evaluated the performance of each of these eBikes.
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