Forestal Siryon Diode Lightweight eMTB Review | 2023 eMTB SL Roundup



Photos by Max Rhulen & Dusten Ryen
Video by Brian Niles / Treeline Cinematic

We’ve been dreaming of reviewing a Forestal eBike for years now. In fact, up until just a few months back when Robert got to visit their HQ and ride the Siryon for the first time, we hadn’t even seen one in person. When we were putting together plans for our first SL, lightweight eMTB Group Review this year, Robert was adamant that the Forestal Siryon had to be in the mix. He was very impressed after his time riding the Siryon over in the UK and looked forward to our feedback on the trails here in the West. Unfortunately, we had a few issues with the Forestal Siryon during our review and didn’t quite feel the same way as Robert, but we’ll get into that more below.


• 170mm Twin Levity Suspension
• 29” Wheels
• Forestal EonDrive Motor by Bafang
• 350Wh Battery
• Fixed Geometry
• HTA 64
• STA 77 (effective)
• REACH 488 (Large)

Price: $7,200 – $10,750

2023 SL EMTB SHOOTOUT SERIES – The Forestal Siryon Diode was one of the eight eMTBs we tested in our inaugural lightweight eBike group test. We’ve seen a rapid and impressive growth in this category and after fielding so many requests and comments in our well established, annual full-power EMTB SHOOTOUT series, it only seemed natural to give this category the attention it deserves.

This group review was made possible thanks to the amazing support of Schwalbe Tires and their brilliant new Tacky Chan tires, which we outfitted each and every bike with for a consistent test platform.

We’d also like to thank Ninja MTB and Glade Optics.

Our crew did plenty of testing around Central Oregon before heading down to one of our favorite places to ride, Klamath Falls, Oregon. Thanks for the hospitality Discover Klamath and the beautiful Running Y Resort.

2023 eMTB SL Group Review: Logo List


We’ve already conducted a review on the Forestal Siryon over in the UK, but for those who didn’t catch that already, let us give you the low-down of this SL, lightweight eMTB. Forestal is a company based in Andorra who were one of the first to market in the lightweight electric mountain bike field, launching a range of three bikes in the category with their own motor, electronics, and suspension system.

DRIVE UNIT AND ELECTRONICS | Forestal SL eMTBs use their unique EonDrive motor – co-developed with Bafang – which produces 60Nm of torque and 430W peak power, with a weight of 4.3lbs (1.95kg) thanks to its magnesium shell and some titanium components inside. This is powered by a 350Wh fixed Forestal Aurora Performance battery, which weighs 3.9lbs (1.8kg) and features rapid charge technology to get you refilled and ready to hit the trail fast. Currently there is no range extender available, but Forestal is close to bringing a 250Wh unit to market.

The system is controlled with the Forestal Smart Dashboard, featuring a 3.2” transflective touch screen display integrated into the top tube of the Siryon and making for a very premium, high-tech feel. There’s just about every type of connectivity to connect to your phone or riding tech, as well as WiFi connectivity to allow for software updates to be made. Within the Smart Dashboard is an inbuilt navigation system with maps, and the bike features sensors to track and log ride data from GPS-fed speed and elevation, through to G-forces and even airtime. There’s also the possibility to locate a stolen bike if you’re ever in need, using the Forestal app. Overall a very cool and unique feature that makes this bike standout, however we did notice it takes quite a few seconds for the system to “Boot up” and the screen to display data, although the drive unit works and power will be on, the screen does lag behind.

A bar mounted, wired remote gives three buttons to control power. You’ve got On/Off; Mode +; and Mode – as well as Walk mode, though an updated toggle-style ring remote is in development. Currently riders are limited to four pre-set power modes, which give a progressive increase in power, but Forestal will open each of these modes to customization in the near future to allow riders to tailor the performance to their liking. The remote features LEDs which serve as battery indicators as standard, and as mode indicators when the mode is switched. But of course, you also have the option to see detailed percentage readout for the battery in addition to speed and many other elements on that top tube display.

Forestal Siryon Diode Lightweight eMTB Review | 2023 eMTB SL Roundup

FRAME AND FEATURES | The Forestal Siryon is produced with their Alpha Box carbon monocoque frame construction, with tailored carbon fiber materials in different areas of the frame to optimize the strength, stiffness, and weight, which let them take a medium frame in at 5.29lbs (2.4kg). Forestal didn’t ignore the key details with their first enduro eMTB: Within the front triangle you can get a large water bottle, there’s a SRAM UDH derailleur hanger and integrated upper chain guide, cables are routed through the headset and internally through the rest of the frame for clean looks, with a 150° BlockLock headset preventing damage in a crash. The rear triangle features an inbuilt fender to protect the Twin Levity linkage; and there’s generous custom molded protection around the bike to keep it safe from damage.

SUSPENSION | For their first bike range, Forestal wanted to obtain their ideal performance characteristics, which led them to develop their own Patented Twin Levity suspension system. This is a single pivot suspension system, with the shock driven off a series of links that produce a leverage ratio curve that they deemed to be optimal. Kinematics are tuned slightly for each frame size to offer consistent feel, and shocks are custom-tuned to deliver the best performance. Overall progression is 32%; and at sag there’s roughly 110% Anti Squat and 105% Anti Rise. Interesting to note is that Forestal recommends 25% sag at the shock to obtain the best performance.

Forestal Siryon Diode Lightweight eMTB Review | 2023 eMTB SL Roundup

GEOMETRY | As the longest travel bikes in the group test, the Forestal Siryon and Transition Relay have very comparable geometry with only 4mm difference in wheelbase and are the most aggressive on test. That said, their numbers do not venture into the overly extreme realms, still offering a touch of versatility for mellower and tighter trails.

BUILD SPECS | The Forestal Siryon is offered in three build kits, from the most affordable Halo build kit at $7,200 to the top-end Diode build we were provided to test at $10,750. This Diode built kit features a selection of exotic components that goes some way to justifying the price tag, and actually make it feel like reasonable value compared with some of the other bikes on test that cost an extra $3-4k. This build tipped the scales at 42.8lbs. The frames come with a 7-year warranty, with two years on the paint work and electronics.

This Diode build features an Ohlins suspension package, with the 170mm RFX36 M.2 fork and a TTX Air rear shock. This proved to be one area we differed greatly from Robert and his review experience. The drivetrain is a SRAM XO1 AXS Eagle setup, though the UDH means the Siryon is T-Type compatible, and it’s matched by the AXS Reverb dropper seatpost. The brakes are the Braking INCAS 2.0, an Italian-made CNC’d brakeset with unique looks and feel; the cranks are carbon fiber arms made by Praxis; and the wheelset is the Crankbrothers Synthesis Carbon E11. As standard this bike is equipped with a Maxxis Minion DHF EXO front tire and High Roller 2 EXO rear tire, but for this shootout we installed a grippy set of Schwalbe Tacky Chan’s as our official test tire.

Forestal Siryon Diode Lightweight eMTB Review | 2023 eMTB SL Roundup


SETUP | Unfortunately the Forestal was the last bike to show up, meaning we had the least amount of time to pre-ride and get base miles on it before taking it to Klamath Falls for the Roundup. On the flip side, since all the other bikes were dialed in, we could dedicate our energy and time to get this beautiful new machine feeling right. That proved to be a rather time-consuming endeavor, however. The suspension, primarily the RFX36 fork was an enigma. The air pressures suggested on the chart were pretty far off from what we felt comfortable with, and it felt like we constantly battled with sitting too low in the travel or having an overly stiff top-end that had our front end washing on the flat, loose and dry marbles of Central Oregon.

Beyond the suspension, we got along quickly with the Forestal. The cockpit, geometry and general feel on the bike was comfortable and had our riders feeling powerful and confident aboard the Siryon. The bar and stem aren’t the best looking but worked well-enough for our crew.

ELECTRONICS & INTEGRATION | We liked the Forestal experience as a whole. As mentioned above, waiting for the screen to power up was a bit longer than ideal, but you can start riding and pedaling with assistance while the screen is still booting up. App and information navigation on the screen was fun and plentiful. Even with gloves, the screen was navigable and had us looking down more often than was probably safe. Seeing those G-Force and Air Time readings was pretty cool. The ability to track workouts, navigate via map and so many other features make the Forestal user experience more sophisticated than anything else we’ve ridden. Is it necessary? Absolutely not, but it is really cool.

Forestal Siryon Diode Lightweight eMTB Review | 2023 eMTB SL Roundup

POWER & RANGE | For 99% of our ride time aboard the Forestal Siryon, the drive unit was near the front of the pack when it came to power and speed. The Giant’s SyncDrive and Fazua-equipped Transition and Pivot felt a bit more powerful in certain scenarios but the Forestal/Bafang collab unit had us hot on their heels. It is definitely a loud drive unit, emitting a unique and notable tone that reminded you which bike you were on. It wasn’t quite as loud as the Levo SL but notably louder than other drive units.
The range was on-par with other 360Wh bikes, although when you’re riding a big and burly 170mm enduro bike, we had the tendency to burn the battery a bit quicker because we were inevitably hunting out steeper mountains and trails to ride. The forthcoming range extender will be a very welcome addition to add range.

Safe Mode – On our final day of filming we were taking out some of our higher ranked bikes to finalize some impressions, when we suddenly lost almost all drive unit assistance on some self-shuttled DH laps. Temps were in the mid to high 90’s and we had all the bikes in the middle or “Trail” power modes. I (Drew) was on the Forestal and found myself dropping back and having to work harder to keep up. I increased the power mode and felt only a little relief for about a minute or two until I was once again doing the lion’s share of the work. I spent the last 8-10 minutes of the climb switching between power modes trying to find one that offered some sort of assist, but got nothing. Once we got to the top, dropped into our descent and the drive unit cooled off, it seemed to return to normal operations for the remainder of the ride.

We emailed Forestal, who in-turn reached out to Bafang for some insight as to what may have happened. We will include their full response below, but the short version is that the unit has a built-in “Safe” mode that kicks in and drops power when the drive unit reaches a certain temperature. The drive unit is currently en-route for a full tear down and diagnostic evaluation to check all the data from which power modes we were in and for how long, as well as what temperature the Safe mode kicked in at. While they’re happy it worked and prevented permanent damage, they suspect it may have kicked on a bit too early and want to find out why that may have happened.

CLIMBING | We felt comfortable and capable while climbing the Siryon. It was a solid bike to get up and over most terrain, however the length and height of a 170mm 29er is notable when climbing the steepest and tightest switchbacks. If you’re willing to drop the saddle 25% and maybe do some out of the saddle finessing, it’s nothing that can’t be overcome, and for riders who normally spend time on longer travel 29ers will be well accustomed to the concessions made on techy climbs. Aside from that, the bike was comfortable, had a nice suspension platform that blended traction and a relatively efficient rear end with a spacious reach.

Forestal Siryon Diode Lightweight eMTB Review | 2023 eMTB SL Roundup

DESCENDING | Where the Forestal Siryon is designed to shine! As much as we didn’t love the Ohlins suspension spec on our bike, we saw the capabilities and impressive performance that the Siryon possessed. Our testers particularly liked the Siryon on the jump trails and flow lines as the light weight of this big mountain bruiser left the ground effortlessly and in a controlled manner.

When it came time to get low and let the Siryon plow over the countless rock gardens we sought out, our riders felt the length, confidence and stability were standout features. With the current suspension spec we felt that riders were rewarded when it was a straighter section and you could really let the speeds stay high. If you got off-line or slowed down a bit, the bike, especially the front end could get a bit cumbersome and resulted in hand fatigue.

Similarly, the front end was harder to manage on loose-over hard pack flat corners and areas where traction was scarce. The fork lacked the suppleness we needed to keep that front tire glued to the ground and feeling confident to push hard.

FINISH AND VALUE | From a fit and finish perspective, the Forestal Siryon stands out from the pack when it comes to aesthetics, attention to detail and overall “wow factor”. From the boutique Braking brakes, Ohlins suspension and AXS drivetrain, Forestal offer some impressive options that are competitively priced compared to the other brands and relative price points.

The paint color and finish are eye-grabbing and the Siryon was regularly the first bike people noticed when we were out on the trails. Forestal have done a good job delivering a boutique, crafted machine that owners will be proud to pull up to the trail with.

Forestal Siryon Diode Lightweight eMTB Review | 2023 eMTB SL Roundup

The Wolf’s Last Word

We will base our summary off the assumption that the drive unit we had in our test bike had some sort of an issue that caused it to engage the Safe Mode earlier than it should have. With that assumption made, the climbing performance was on-par with other SL category eMTBs albeit with a bit more noise than Fazua, TQ,  and Shimano RS units. The handling, playfulness and descending capabilities of the Forestal Siryon are very solid all-around but we couldn’t quite tap into the full potential as our testers just didn’t jive with the Braking brakes and especially the Ohlins fork. Overall, the Forestal Siryon is a good bike that has plenty of good traits, but we’d likely opt for a lower-tier model that comes with different suspension and brakes that we’d likely get along better with.

For a small brand to offer such a unique and well-detailed bike with class-leading technical integration with their top tube display and a relatively competitive price, the Forestal Siryon is a cool lightweight eMTB, but ultimately with this spec, not one that we’d rush to buy over some of the other bikes we’ve ridden.


Aggressive, enduro-type riders who want to jump and shred hard, but don’t need a big battery or range and like to tune Ohlins suspension. We’d wager that other suspension spec’d models will be more user friendly for a wider audience and that it would untap the bike’s potential quicker. Tech geeks who love the touch-screen and riders who love owning that unique, attention-grabbing bike will also love the details and finish of the Forestal.

Price: $10,750 (Diode)
Weight: 42.8lbs


Frame: Alpha Box Carbon | 170mm
Fork: Ohlins RFX36 M.2 | 170mm
Shock: Ohlins TTX Air | 230x65mm

Motor: Forestal EonDrive | 250W | 60Nm | 1.95kg
Battery: Forestal Aurora Performance | 350Wh | Integrated | Rapid Charge | 1.8kg
Display: Forestal Smart Dashboard | Touchscreen | 3.2” HD Transflective Display
Remote: Forestal Smart Trigger | 3 Buttons | Wired | Battery and Mode LEDs

Brakes: Braking Incas 2.0, 200F/180R rotors
Handlebar: Forestal Oxydon Carbon | 800mm | 15mm Rise
Stem: Forestal Oxydon | 31.8mm clamp | 45mm Length
Headset: Acros Integrated | Internal cable routing | Blocklock 150°
Seatpost: Rockshox Reverb AXS | S: 125mm, M/L: 150mm, XL: 170mm
Saddle: Fizik Aidon X3 E-MTB

Wheels: Crankbrothers Synthesis Carbon E11
Front tire: Maxxis Minion DHF | 29″ x 2.4″
Rear tire: Maxxis High Roller 2 | 29″ x 2.4″

Cassette: SRAM XG 1299 | Rainbow | 10-50T
Cranks: Praxis Carbon | 170mm Q-Factor | S/M: 160mm, L/XL: 165mm
Shifter: SRAM Eagle AXS Controller | 12s
Derailleur: SRAM X01 Eagle AXS | 12s

We Dig

Fit and Finish
Class-leading display screen and tech
Light and playful in the air
Stable and ready to charge

We Don’t

Suspension spec didn’t allow us to totally click with the bike
Braking brakes aren’t our favorite
Motor went into safe mode


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