Cannondale Topstone Neo SL 2 Electric Bike
$2,540.93Compared to $3,630.00* Save 30%
A lightweight, capable and versatile e-bike that thrives on gravel and mixed-terrain riding, the Cannondale Topstone Neo SL 2 was built to chase horizons, explore and accelerate your daily routine.
Key Details
E-Bike Classification
Class 1: pedal assist up to 20 mph
Motor
Mahle ebikemotion X35 250W
Battery Capacity (Wh)
250 watt hours
Weight
32 lbs. 6.4 oz.
- SmartForm C2 Alloy frame and a full carbon fork are a lightweight yet durable combo
- Shimano GRX 400/600 drivetrain and hydraulic disc brakes offer excellent on- and off-road performance
- Light and powerful Mahle ebikemotion X35 250W rear-hub drive system offers 3 levels of support for pedal assist up to 20 mph and a range of up to 47 mi. (75 km)
- Multiple gear and bottle mounts let you customize your carry
- Integrated top tube controller lets you turn the system on, select your assist level and see your battery charge at the touch of a button, keeping your handlebars uncluttered
- Dialed endurance fit is upright enough for comfort over the long haul and control when tackling off-road terrain, yet low and forward enough for speedy efficiency
- Roomy frame and fork offer plenty of clearance for the included 700c x 42 mm tires
- A simple to use, easy-access charging port makes topping up the battery a breeze
- You can also plug in an optional range extender (not included) for a total battery capacity of 450 Wh and take your rides even farther
- Pedals not included
- NOTE: Specs and images are subject to change based on component availability
Imported.
This e-bike comes with Coast to Coast Support, which includes:
New bikes go through a normal break-in period, after which they should be readjusted. All electric bicycles sold at REI include free adjustments for the defined period (one year after purchase date for non-members, or two years for REI Co-op Members)—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation, chain lubrication and e-bike firmware updates. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.
View the Cannondale Topstone Product LineView all Cannondale Gravel Bikes- 1 year of free adjustments (see more below)
- In-store bike assembly
- Pickup in store or curbside
- Bike experts available at 170+ bike shops
- An additional year of free adjustments on e-bikes
- 20% off shop services
- Free tubes with purchase of flat tire repair (Co-op Cycles brand tubes only; tube must be installed at time of purchase)
New bikes go through a normal break-in period, after which they should be readjusted. All electric bicycles sold at REI include free adjustments for the defined period (one year after purchase date for non-members, or two years for REI Co-op Members)—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation, chain lubrication and e-bike firmware updates. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.
| Best Use | Road Cycling Gravel Cycling |
|---|---|
| E-Bike Classification | Class 1: pedal assist up to 20 mph |
| Motor | Mahle ebikemotion X35 250W |
| Motor Type | Geared Hub |
| Motor Torque (Nm) | 40 Newton meters |
| Battery Type | Lithium Ion |
| Battery Capacity (Wh) | 250 watt hours |
| Battery Removable | No |
| Charge Time (hrs) | 4 hours |
| Pedal Assist Range | 47 miles |
| Frame | SmartForm C2 Alloy with flat-mount disc |
| Bike Suspension | No Suspension |
| Fork | Carbon with 1-1/8 to 1-1/4 in. steerer, 55 mm OutFront offset, flat-mount disc, internal routing, 12 x 100 mm thru axle |
| Fork Travel | Not Applicable |
| Crankset | Shimano GRX 600, 46/30T |
| Bottom Bracket | Shimano BSA Sealed |
| Shifters | Shimano GRX 400, 2 x 10-speed |
| Rear Derailleur | Shimano GRX 400, Shadow RD+ |
| Rear Cogs | Shimano HG500, 11-34T, 10-speed |
| Number of Gears | 20 gear(s) |
| Brake Type | Hydraulic Disc Brake |
| Brakes | Shimano GRX hydraulic disc, 160 mm RT56 rotors |
| Brake Levers | Shimano GRX hydraulic disc |
| Rims | Cannondale Disc, double wall, tubeless-ready 32h in rear and 28h in front |
| Front Hub | Formula CL-712, 12 x 100 mm thru axle, disc |
| Rear Hub | Mahle ebikemotion X35; 135 mm bolt-on |
| Wheel Size | 700c |
| Tires | WTB Resolute Comp, 700c x 42 mm, tubeless-ready |
| Tire Width | 42 millimeters |
| Handlebar Shape | Drop Bar |
| Handlebar | Cannondale 3, butted 6061 alloy, 16 degree flare drop |
| Stem | Cannondale 3, 6061 alloy, 31.8 mm, 7 degree |
| Seat Post | Promax SP-2032, alloy, 27.2 mm |
| Saddle | Fabric Scoop Shallow Sport, steel rails |
| Pedals | Not included |
| Headset | Integrated; 1-1/2 to 1-1/8 in. (lower to upper) tapered with reducer; 25 mm alloy top cap |
| Chain | 10-speed |
| Weight | 32 lbs. 6.4 oz. |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Unisex |
Cannondale Bikes (186752)
| S | M | L | XL | |
|---|---|---|---|---|
| Reach | 37.7 | 38.7 | 39.4 | 40.2 |
| Stack | 54.7 | 57.8 | 61.1 | 64.0 |
| Effective Top Tube | 53.4 | 55.3 | 56.9 | 58.6 |
| Seat Tube Center-Top | 44.5 | 49.0 | 53.5 | 58.0 |
| Standover Height | 75.1 | 79.0 | 83.0 | 86.9 |
| Head Tube Length | 12.6 | 15.7 | 19.1 | 22.2 |
| Head Tube Angle (degrees) | 70.5° | 71.0° | 71.0° | 71.0° |
| Seat Tube Angle (degrees) | 74.0° | 74.0° | 74.0° | 74.0° |
| Bottom Bracket Height | 65.4 | 65.4 | 65.4 | 65.4 |
| Wheelbase | 103.1 | 104.7 | 106.5 | 108.3 |
| Chainstay | 43.0 | 43.0 | 43.0 | 43.0 |
| Fork Offset | 5.5 | 5.5 | 5.5 | 5.5 |
Sizing Notes
Measurements are stated in centimeters unless otherwise indicated.
How we measure bikes
- Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
- Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
- Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
- Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
- Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
- Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
- Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
- Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
- Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
- Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
- Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
- Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.
Buying Advice
Review this Product
Adding a review will require a valid email for verification
Most Helpful Favorable Review
Good, then Bad, now Good Again!
cbrenna3 years ago
I looooove this bike. It's fast. It's fun. It doesn't look like a giant chunky e-bike. I can keep up with my husband who is a much more serious cyclist.
Unfortunately it got the dreaded pink flashing light after the third charge and would no longer turn on. Unlucky for me since I was out on a trail in the middle of a national park when it happened. After doing everything I could via researching online, I came to the conclusion that I would have to take it in.
I got the runaround from my local REI (Lynnwood, WA), who shrugged their shoulders and suggested I call Cannondale. Cannondale confirmed the dealer (REI) had to do a firmware update to keep the battery from overcharging itself and bricking (pink flashing light). I checked with a different REI an hour away (Bellingham, WA) and had a couple of lengthy phone calls with their techs. They were kind enough to go down the rabbit hole. They spoke to REI corporate, spoke to the battery manufacturer, ordered the cable and firmware update dongle they needed, and got my bike fixed in a couple of weeks.
I've got it back and it's working great. I recommend this bike, but I don't recommend taking delivery without getting the firmware update FIRST. Keep calling until someone is willing to help you out.
cbrenna
Edmonds, WA
40 people found this review helpful
Most Helpful Critical Review
Total Failure
Folsom Bikers3 years ago
We bought two of these bikes but were never able to ride them. When we fully charged the bikes, both bikes showed a system error and the electrical assist did not work. We took them back to REI and were told that the (brand new) batteries needed to be replaced but none would be available for several months. We were also told that this is a common issue and that we should avoid bikes with this ebike system (Mahle). So why is REI continuing to sell them? Very frustrating!
Folsom Bikers
63 people found this review helpful
Sac_Commuter
Faulty controller software/firmware
3 years ago
This bicycle threw an overvoltage protection fault (#193) on the first charge, disabling the ebike motor. I find it absurd that charging the bike could brick it. The software/firmware is NOT user-accessible, and will require REI to service on your behalf. This fault is known to Mahle EBikeMotion, and a firmware update is available that allegedly fixes this issue by increasing the voltage tolerances...but only to REI or a similar authorized dealer. Should you purchase this bike, I'd recommend NOT taking delivery without having the firmware updated. My bike is out for 2+ weeks just to get this done.
No, I do not recommend this product
McTrebor
Portland, OR
Think Mahle is getting a bad rap here!
1 year ago
I own a Cannondale with the Mahle X-35 system purchased from REI. There was an early problem with the battery that was replaced under warranty thanks to REI Tualatin. They got in touch with Mahle U.S. reps. Mahle was great with firmware updates. They fixed w firmware update to error code for range extender battery. My point here is the my REI team established rapport with Mahle reps and issues were quickly resolved. It’s a great system with a sophisticated useful app allowing adjustment of assist levels. With range extender battery 60-70 mi rides are possible. The Cannondale Topstone with the Mahle X-35 system should be a great reliable light ebike.
Weight:150–175 lbs.
Inseam:30"
Height:5'8"
Experience Level:Experienced
Riding Frequency:Multiple times per week
Yes , I recommend this product
Folsom Bikers
Total Failure
3 years ago
We bought two of these bikes but were never able to ride them. When we fully charged the bikes, both bikes showed a system error and the electrical assist did not work. We took them back to REI and were told that the (brand new) batteries needed to be replaced but none would be available for several months. We were also told that this is a common issue and that we should avoid bikes with this ebike system (Mahle). So why is REI continuing to sell them? Very frustrating!
No, I do not recommend this product
CThompso
Kansas
Great ride!
3 years ago
I bought my bike in November 2021. I have had none of the issues listed on the other reviews. I rode it on a bicycling tour, OK Freewheel which starts in Texas goes across Oklahoma and ends in Kansas. This year route included crossing over into Arkansas and Missouri which had some great climbs! My Top Stone got me up those “mountains”! Mileage was on the average about 65 miles daily. My battery was good for about 45 miles. I would ration the usage somewhat. The battery never did go dead. The auxiliary battery can now be ordered from REI. Mine is in the mail! So I will have a back up battery for those longer rides, just in case I need a little boost. I love the new App! It works great, the information on it is awesome. Again I’m am so happy with my Awesome new bike! 
Age:65–74
Weight:150–175 lbs.
Inseam:32"
Height:5'4"
Experience Level:Experienced
Riding Frequency:Multiple times per week
Yes , I recommend this product
cbrenna
Edmonds, WA
Good, then Bad, now Good Again!
3 years ago
I looooove this bike. It's fast. It's fun. It doesn't look like a giant chunky e-bike. I can keep up with my husband who is a much more serious cyclist. Unfortunately it got the dreaded pink flashing light after the third charge and would no longer turn on. Unlucky for me since I was out on a trail in the middle of a national park when it happened. After doing everything I could via researching online, I came to the conclusion that I would have to take it in. I got the runaround from my local REI (Lynnwood, WA), who shrugged their shoulders and suggested I call Cannondale. Cannondale confirmed the dealer (REI) had to do a firmware update to keep the battery from overcharging itself and bricking (pink flashing light). I checked with a different REI an hour away (Bellingham, WA) and had a couple of lengthy phone calls with their techs. They were kind enough to go down the rabbit hole. They spoke to REI corporate, spoke to the battery manufacturer, ordered the cable and firmware update dongle they needed, and got my bike fixed in a couple of weeks. I've got it back and it's working great. I recommend this bike, but I don't recommend taking delivery without getting the firmware update FIRST. Keep calling until someone is willing to help you out.
Age:35–44
Weight:125–150 lbs.
Inseam:30"
Height:5'7"
Experience Level:Experienced
Riding Frequency:Once per week
Yes , I recommend this product
Ebikerider
Ga
2 bikes Broke immediately
3 years ago
The first bike had a cell overcharge after the first ride and the error code couldn’t be fixed. The second bike had a faulty motor. The Mahle Ebike system is too unreliable to justify the price. Stick with Bosch or Shimano
Age:25–34
Weight:175–200 lbs.
Inseam:32"
Height:6'0"
Experience Level:Competitive
Riding Frequency:Daily
No, I do not recommend this product
Jack
Boston, MA
Faulty Controller
3 years ago
We purchased this bike and on the second charge we had an error that completely disable the electronic component of the drive train. We had to take it back to REI to service as the firmware can't be updated.
Age:35–44
Weight:150–175 lbs.
Inseam:30"
Height:5'10"
Experience Level:Experienced
Riding Frequency:Daily
No, I do not recommend this product
JMikeG
Spokane, WA
Battery/Firmware Fault. Never got to ride
3 years ago
Same problem as everyone else. Very first charge and the firmware took a dump. Took back to REI and the repair guy said I was better off returning it. Too bad because if it worked it looked like it wood be a sweet ride.
No, I do not recommend this product
TMMA
Great for slopes
3 years ago
I've ridden over 1200 kilometers with Neo SL2 for a year now and I haven't had any issues with it! The Weight ratio between rear and front differs a little bit too much on difficult paths, but otherwise it's great!
Age:35–44
Weight:175–200 lbs.
Height:5'7"
Experience Level:Experienced
Riding Frequency:Once per week
Yes , I recommend this product
Kman
Reno
this bike rips
3 years ago
This might be a little premature as I've only had the bike a few days, but since this is a newer product with many reviews I wanted to share my first impressions. This bike is GREAT. I bought it to replace a commuter electric bike that failed after a few hundred miles. With only 70 miles on this bike so far I have no way of knowing if it will withstand the daily grind. But it flies as a commuter and the short gravel trails I've taken it out on so far have been a blast. Shifting took some time to get used to, but it is buttery smooth and the brakes have great stopping power. A bike like this can tempt one to ditch the car altogether. My one complaint would be that the charger is more annoying to plug in than it should be because you have to line up the prongs. This bike is beautiful and has the right amount of engineering to retain a little old school feel despite being modern. Astonishingly light for an ebike, it literally weighs about half of my last ebike, which makes hauling it up the stairs to my office much easier. Looking forward to taking it out on the trails this spring.
Age:25–34
Weight:200–225 lbs.
Height:5'9"
Experience Level:Experienced
Riding Frequency:Daily
1 - 10 of 12 Reviews