BIKER'S EDGE

Here we go on the all-new Transition Regulator. With two versions and two different motors—CX for full power and SX for a lightweight, more pedal-bike-like feel—the Regulator has something for everyone. Transition designed this bike to be more responsive and lively with a more natural ride experience than their other eMTBs. After riding both models, I can confidently say they each have their own distinct personality. The CX leans more toward capability and stability, while the SX is a lively, playful ripper. Stick around to see how they scored.

Here’s What you Need to know about the Transition regulator

Here’s the basics you need to know before we go hit the trails. The Transition Regulator is an all-mountain eMTB designed around a MX wheel setup. It comes in two distinct versions: the CX, powered by Bosch’s full-power Performance Line CX motor, and the SX, which runs the lighter Performance Line SX motor for a more traditional MTB feel.

Wheel Size and Travel

• Front Travel: 160mm
• Rear Travel: 150mm (160mm compatible with a longer-stroke shock)
• MX Only: 29” front for rollover and stability, 27.5” rear for a playful, agile ride

Geometry Highlights

• Head Tube Angle: 64.5° (High), 64.0° (Low) – Geometry adjust only available on CX
• Seat Tube Angle: 78.5° (High), 78.0° (Low) – Geometry adjust only available on CX
• Reach: 510mm (XL)
• Chainstay Length: 448mm (XL)
• Wheelbase: 1305mm (XL)

Bosch Motor Options

• Regulator CX: Powered by Bosch Performance Line CX with 85Nm of torque and 600Wh battery. The battery is fixed inside the downtube for a clean look and minimal noise. Optional 250Wh range extender available for longer rides (only fits M-XL frames.)
• Regulator SX: Bosch Performance Line SX with 55Nm of torque and a compact 400Wh battery. Prioritizes weight savings and a sporty, pedal-bike-like ride. An optional 250Wh range extender is available for all frame sizes.

Weights

• Regulator CX (XL) – 47.7lb.
• Regulator SX (XL) – 41.9lb.

Transition Regualtor: Ride Review

Bosch Drivesystem

All right, let’s talk about the drive systems on the Transition Regulator. There are two options here: the CX motor, which is the full-power 85Nm unit, and the SX motor, a lightweight version with 55Nm of torque. Both have distinct personalities and strengths, so let’s break them down.

Regulator CX

The CX motor is still top of the class for me in terms of power, reliability, and integration. It’s quiet, powerful, and does everything you ask of it. With plenty of torque and smooth delivery, it checks all the boxes for a full-power eMTB.

The only downside? The Regulator CX only runs a 600Wh battery. If you’re planning epic, all-day rides, you’ll probably want to grab the optional 250Wh range extender. Without it, you’re looking at around 3,200 to 3,500 feet of vert on a single charge—at least, that’s what I get at 200 lbs in full boost mode.

Regulator SX

Now, let’s talk about the SX drive system. This motor is Bosch’s lightweight, reduced-power option. It puts out 55Nm of torque and comes with a 400Wh battery, making it noticeably lighter than the CX version.

The big advantage of the SX is the power-to-weight ratio. It’s light and efficient, giving you a surprising amount of punch for how little it weighs. For shorter rides or lighter riders, this setup is great. But if you’re a bigger rider or running boost mode most of the time, you’ll hit the range limit pretty quickly. Expect about 2,000-2,200 feet of vert on a full charge.

It’s worth mentioning there’s a 250Wh range extender available for both versions. It only fits on medium through extra-large CX frames and all sizes of the SX. If you’re on a small frame, you likely won’t need it anyway since lighter riders will get more range out of the stock battery than bigger riders. 

Uphill

Transition Regulator CX

Now, let’s get into how the Regulator performs on the climbs. Both versions have a unique personality, but they’re equally impressive in their own way. Starting with the CX, let’s break down how well this thing goes uphill.

Starting with the Regulator’s suspension, it offers great traction and a more active feel. Because of that, it stays composed and calm on tough technical climbs. The bike stays glued to the ground as you pedal through rough, rocky, and loose sections. In fact, it climbs so well that I found myself sessioning a pretty ridiculous climb—until I stripped the freehub body and had to Strider-bike my way back to the truck.

The geometry and body position also play a big role in its climbing prowess. The moderately low front end keeps your weight over the front wheel on steep climbs, helping with traction and control. The size-specific chainstays are fairly moderate to long, which keeps your weight well-centered on the bike. This body position gives you great control, making tight, twisty technical climbs much easier.

Combine all that with the small rear wheel, which spins up quickly and adds to the bike’s maneuverability, and you’ve got an exceptionally solid technical climber.

Transition Regulator SX

Now, let’s chat about the SX version for a second. For the most part, it’s fairly similar to the CX. The geometry is the same, and the suspension feels nearly identical. The real difference comes from the lighter weight and reduced power, which significantly affects how it handles and climbs.

Thanks to its better power-to-weight ratio, this bike is pretty damn fast uphill. Combine that with its improved handling, and I actually found the SX to be faster in a lot of situations compared to the CX. On tighter, more technical climbs, the SX’s lighter weight and quicker acceleration give it the edge. It’s snappy and responsive, making it easier to speed up, slow down, and weave through corners. On straight, more open climbs, the CX will still be faster due to its extra power, but in constantly changing terrain, the SX feels quicker and more efficient.

And, of course, you still get great traction and control through rough sections thanks to the suspension platform. The body position also stays consistent, giving you excellent control over the bike and making those technical sections feel manageable.

Downhill

Let’s talk about how the Transition Regulator performs on the descents. Both versions prioritize handling and playful, natural ride quality over pure plow-and-smash capability. That said, these bikes are still very capable—you could take them just about anywhere and have a good time.

CX Version – More Play than Plow

The CX version leans more toward fun and engaging ride quality rather than bulldozing through everything in its path. It’s lively, responsive, and supportive, with a stiff frame and well-balanced geometry that helps keep it feeling agile.

The suspension is plush and easy to get in to, giving the bike a calm, composed ride through rough sections without feeling harsh. It’s certainly not as capable as something like the Orbea Wild or Transition Repeater, but that makes sense—those bikes have significantly more travel and slacker geo. What the Regulator CX does offer is forgiveness and ease of use. It’s easier to get along with and has a very natural, intuitive feel that just makes it fun to ride right from the get go.

SX Version – Pedal-Bike Feel

The SX takes the playful vibe even further. With lighter-weight components and a less robust build, the bike feels even more like a traditional mountain bike. It loses a bit of capability compared to the CX, but it still holds its own. I wouldn’t hesitate to take the SX just about anywhere—it just feels a little more spry and agile than its full-power sibling.

Geometry & Balance

The geometry on both bikes is the same, with one exception: the CX version has a flip chip that allows it to be half a degree slacker than the SX. Both have a moderate body position that feels balanced between the wheels. The reach is roomy, and the long-ish rear center keeps things stable without losing that natural, agile ride quality Transition aimed for.

Cornering & Playfulness

Both versions are great in corners, thanks to their front-to-back balance, solid traction from the suspension, and MX wheel setup, which helps the bike lean over easily and snap around corners quickly. Whether the corner is flat and loose or bermed and hardpacked, the Regulator loves to corner. 

Getting Off the Ground

Both bikes are easy to bunny hop. They’re relatively light for their respective categories, and the suspension strikes a nice balance between support and ease of engagement. The Regulator rewards creativity, encouraging you to take goofy lines, jump off every root and rock, and just ride in a fun, playful way. I think Transition has been able to make a “Sentinel” with a motor in it.

transition regulator: Comparisons

Now we’re getting into comparisons, and there are two bikes that really come to mind when thinking about the Transition Regulator:

The Santa Cruz Vala, which is more of a direct comparison to the CX version, and

The Orbea Rise LT, which stacks up closely with the SX version.

Transition Regulator cx vs santa cruz vala

feature	regulator cx	santa cruz vala
Suspension Feel	Supportive, active platform with great traction and control	Smooth, plush ride with a more planted feel
Handling	Quick and playful, easy to get off the ground	Stable and confidence-inspiring, especially at speed
Climbing	Composed and calm on technical climbs	High front end aids traction but can feel vague
Braking	Strong and consistent with TRP brakes	Rear wheel tends to break loose under hard braking
Overall Ride	Lively and fun, built for varied terrain	Planted and capable, with a slight downhill focus

I still need to do a bit more back-to-back riding on these two because they’re damn near identical. Honestly, we probably have an entire showdown in the works. For now, though, I’ll give you a quick breakdown.

If you were blindfolded, it would be tough to tell which bike you were riding. The biggest difference I’ve noticed so far is the front-end height. The Vala’s front end sits a bit higher, which gives it more confidence on steep descents, but it can also feel a little vague at the front wheel.

From a suspension standpoint, they’re fairly similar, but my Vala is running Fox suspension, while the Regulator CX is equipped with RockShox. There’s definitely a difference in feel, but I’m still not sure how much comes down to frame kinematics versus suspension components. It might be worth swapping suspension between the two to get a clearer picture.

One thing I struggled with on the Vala was the rear wheel breaking loose under hard braking. I don’t have that issue on the Regulator. I think it’s mostly due to the brakes—the Vala has SRAM Code brakes, while the Regulator CX runs TRPs, which feel more suited to this bike.

Apart from those differences, there’s not much separating the two. Both are extremely capable, lively, and fun to ride.

Read the Vala review here.

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What Would I Change About the regulator?

All right, let’s talk about what I’d tweak on the Transition Regulator. Don’t get me wrong—I really like this bike. Straight out of the box, it was easy to get along with, and I felt right at home almost immediately. But, as with any bike, there are a few things I’d change.

First off, I’m personally fine with the 600Wh battery on the CX version, but I know some folks are going to want more range. Having the option to run both a 600Wh and 750Wh battery would give riders a bit more flexibility and better meet different needs. It’s not a dealbreaker, but it would be nice to have that option.

The other thing worth mentioning is the pivot bolts. We’ve had a few back out during rides. It’s not a huge issue—a little Loctite should take care of it—but it’s something I’d recommend checking regularly.

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Transition Regulator scores

We’re going to score each model independently here. Let’s start with the CX.

Regulator CX

drivesystem: +1

• Still top of the class for performance, in my opinion
• Quiet, reliable, powerful
• Only has the ability to run the 600Wh battery

Climbing Performance: +1

• Good body position for good traction and control
• Good handling on tighter, trickier climbs
• Composed and calm on tech climbs

Descending Capability: +1

• More play than plow. 
• Stiff, robust frame and build keep things composed in the rough for the travel category

Suspension Performance: +2

• For the category you can’t ask for better. Great balance between traction and support
• Lively, poppy while providing traction and control

Handling: +1

• Even though it’s the full power option, the handling is still very light for the category
• Easy to get off the ground
• Sharp in the corners

Versatility: 0

• Geo adjust flip-chip
• Ability to run 160mm rear travel with 65mm stroke shock

Intangibles: 0

• No big standouts here one way or another
• Pivot bolts have backed out, so make sure to check them from time to time

Regulator SX

drivesystem: 0

• Great power and assistance from a lightweight motor
• Short on range

Climbing Performance: +2

• Good power to weight from the motor = fast
• Great handling and control
• Great traction

Descending Capability: 0

• Leans more toward a playful riding style than it does a smashing riding style
• The long wheelbase keeps things stable at speed

Suspension Performance: +1

• Lively suspension feel – easy to bunny-hop
• Lots of traction

Handling: +2

• Quick, spry, and nimble – very quick in corners without sacrificing traction
• It’s very easy to get off the ground
• Right there with the Rise on pedal bike handling quality

Versatility: -1

• Ability to run 160mm rear with a 65mm shock
• Versatile cable routing options
• Less versatile from a ride quality perspective – shorter range, upper difficulty limit

Intangibles: 0

• No big standouts here one way or another
• Pivot bolts have backed out, so make sure to check them from time to time

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Who is the transition regulator for?

To really break this down, we have to look at the Regulator CX and SX individually, because while they share a name, they cater to different types of riders.

Regulator CX – Full Power, Playful Feel

The Regulator CX has a lot in common with the Santa Cruz Vala—from its geometry and suspension to its intended use case. So, if you’re a rider who likes the Vala, chances are you’ll love the Regulator CX too.

But where the CX really stands out is in how light and playful it feels for a full-power eMTB. Most full-power bikes come with a certain level of heft and muscle, making them feel like a bit of a wrestling match on the trail. The Regulator CX avoids that. It’s about as lightweight and agile as you can get for a full-power eMTB, making it perfect for riders who enjoy an active, engaging ride. If you like to take creative lines, bunny hop every root and rock, and slap corners on the way down, the Regulator CX will feel right at home. It’s a great choice for riders who want full-power assistance without the sluggish, overbuilt feel that sometimes comes with it.

Regulator SX – Lightweight, Playful, and Maneuverable

The SX version is for riders who don’t want a heavy, cumbersome eMTB. While full-power bikes are getting lighter and handling better, the lightweight eMTBs still have the edge when it comes to true pedal-bike-like handling—and the Regulator SX is no exception.

This bike is ridiculously easy to maneuver, lean over, and get off the ground. If you’re the kind of rider who likes to stay active on the bike—constantly moving, pumping, and working the trail—this bike will reward that style of riding. The SX encourages a playful, dynamic ride experience, making it a great option for those who prefer a lively feel over sheer power.

Another group that will really benefit from the SX is lighter and smaller riders. Relative to their body weight, a full-power eMTB can feel extra heavy, not just in actual weight but in felt weight—how the bike handles and reacts under them. The Regulator SX feels incredibly light, both in weight and how it moves on the trail, making it a great match for riders looking for effortless control and an easy-to-handle ride.

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transition regulator faq

Learn more about the Regulator CX and Regulator SX.