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Description
shimano 105 di2 gravel bike Synapse Carbon 4 - 54Road Reimagined Go long, go short, go fast. This is WorldTour performance for real world rides. Model Description The all rounder thats anything but average. With SRAMs crisp shifting wireless electronic Rival AXS 2x, SmartSense Gen 2 visibility and awareness tech, and the Synapses legendary ride quality, this ones engineered to disappear beneath youuntil you need it most. Whether the suns setting or the pace is rising, it keeps you alert, lit, and in
Road Reimagined
Go long, go short, go fast. This is WorldTour performance for real world rides.
Model Description
The all-rounder that’s anything but average. With SRAM’s crisp-shifting wireless electronic Rival AXS 2x, SmartSense Gen 2 visibility and awareness tech, and the Synapse’s legendary ride quality, this one’s engineered to disappear beneath you—until you need it most. Whether the sun’s setting or the pace is rising, it keeps you alert, lit, and in command. Call it modern endurance with eyes in the back of its head and plenty of watts in reserve.
What it's for
Comfortable high-performance road riding, long distance missions, fast group rides
Highlights
- Lightweight, smoothly compliant, sleekly aero Synapse carbon frameset with StashPort downtube storage
- SmartSense Gen 2 - Enhanced visibility and awareness from the sleekly integrated system of lights and radar
- SRAM's workhorse Rival AXS group - precise, reliable wireless electronic shifting
- Powerful, controllable braking from SRAM Rival hydraulic disc brakes
- Cannondale C1 Aero 27 Carbon seatpost - speed meets comfort
- DT Swiss E 1800 Spline - light, durable and fast endurance wheelset
Ride Confident
More visibility, more awareness, more integration, with our next-gen SmartSense system. All running from a single concealed battery. Intelligent lights adapt to let other road users know you’re there. While the rear-facing Garmin radar keeps you switched on to approaching traffic. Letting you ride the bike that’s up for anything, whatever time of day or night.
Radar
The rear radar watches your back, alerting you to approaching vehicles so you can ride with ease.
Lights
The headlight is small yet powerful, turning night into day with up to 800 lumens. A daylight function keeps you safe, while its stem-mounted design keeps the cockpit clean.
Battery
Neatly integrated into the downtube, the battery powers lights, radar, and shifting, providing up to 24 hours in flashing mode or over 12 hours in steady mode.
Compliant Comfort
With advancements in our carbon layup, our engineers have made the new Synapse 20% more compliant than its already butter-smooth predecessor, ensuring you feel 100% more comfortable even on the roughest roads.
Like A Glove
A great fit and feel makes for a great ride. And with our Proportional Response Construction, every rider gets that as standard. From the carbon layup through to the geometry, everything on Synapse has been tuned and tested by frame size. So that your bike works in harmony with you to give the best possible ride for you and your height.
Bring it all, bring it on
Our all-new StashPort storage system in the downtube is there when you need it and hidden when you don’t. Paired with its StashBag buddy, you can bring along your ride essentials and know that they’ll be secure, whatever you get up to out there. Meanwhile, best-in-class tire clearance lets you take the idea of riding for longer to a whole new level.
Real World Performance
Designed to go fast, built to go long, and made to keep you comfortable, the Synapse redefines road performance. With a lightweight frame featuring wind-tunnel-sculpted tubing and PB-blasting stiffness-to-weight, it’s a bike that’s ready for anything you demand of it. Just ask Lachlan Morton why he trusted it for his record-smashing lap of Australia. Unreal speed, engineered for real-world roads.
DETAILS
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Platform
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Model NameSynapse Carbon 3 SmartSense
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Model CodeC12065U
FRAMESET
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FrameSynapse Carbon, Proportional Response construction, integrated cable routing, downtube Stashport, 12x142 thru-axle, UDH, BSA 68mm threaded BB, flat mount disc, integrated seat binder, SmartSense Gen 2.0 equipped, fender mounts
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ForkSynapse Carbon, integrated crown race, 12x100mm thru-axle, flat mount disc, internal routing, 1-1/8" to 1-1/5" Delta steerer, 55mm offset, fender mounts
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HeadsetIntegrated, 1-1/8" - 1-1/2"
DRIVETRAIN
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Rear DerailleurSRAM Rival AXS
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Front DerailleurSRAM Rival AXS, braze-on
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ShiftersSRAM Rival AXS
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ChainSRAM Rival
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CrankSRAM Rival, 46/33: 165mm (44cm), 170mm (48-51cm), 172.5 (54-56cm), 175mm (58-61)
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Rear CogsSRAM Rival, 10-36, 12-speed
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Bottom BracketSRAM DUB BSA
BRAKES
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BrakesSRAM Rival AXS hydraulic disc, 160/160mm PaceLine centerlock rotors
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Brake LeversSRAM Rival AXS hydraulic disc
WHEELS
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RimsDT Swiss E1800 Spline, 24h, tubeless ready
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SpokesDT new aero® II Straightpull
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Tire Size32
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Wheel Size700c
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Hubs(F) DT Swiss 370, 12x100mm centerlock / (R) DT Swiss 370 LN Ratchet System, 12x142mm centerlock
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TiresVittoria Rubino Pro IV, 700x32c
COMPONENTS
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HandlebarVision Trimax Aero Alloy: 400mm (44-51cm), 420mm (54-61cm)
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StemCannondale C1 Conceal, Alloy, 31.8, -6°: 80mm (44-48m), 90mm (51cm), 100mm (54-56cm), 110mm (58-61cm)
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GripsCannondale Bar Tape, 3.5mm
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SaddleFizik Vento Argo X5, 140mm
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SeatpostCannondale C1 Aero 27 Carbon, SmartSense compatible, 330mm length, 0mm offset (44-48cm), 15mm offset (51-61cm)
EXTRA
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Extra 1SmartSense Gen 2.0 system (Bluetooth BLE and ANT+ compatible: SmartSense LightSkin U1E ultra-compact 800 lumen variable output headlight, SmartSense Garmin Varia eRTL 615 rear-facing radar/taillight, SmartSense 43.2Wh removable internal battery w/integrated flashlight, SmartSense SRAM AXS charging cable), large StashBag downtube storage bag, tubeless valves
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
Based on 2353 reviews
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Product Reviews
★★★★★ 1
A Catastrophic Failure in Diaper Form
Size: Size 2 (184 Count)
I’m not sure if I just got a bad batch or if these diapers are always this horrendous, but I will not spend another dime to find out—and I strongly urge you to do the same. I loved this brand’s Gentle version. They were everything you want in a diaper: super absorbent, well-fitted, no blowouts. I was their biggest fan. So, when the Gentles weren’t available, I thought, Surely the Plush will be just as good, maybe even better!
I have never been more wrong.
Let’s start with the tabs. These things are folded up like some kind of sick joke, requiring you to unfold them in three separate, precise movements. Miss a step? The tab rips off in your hand, leaving you holding a now-worthless scrap of disappointment. This happened to me. It happened to my mother. It will happen to you.
But wait, there’s more! The side wings are a disaster. The right wing is disproportionately longer than the left, which means everything in this diaper is permanently listing to the right like a sinking ship. The left side? Practically non-existent. As a result, I have experienced more blowouts with these diapers than in my daughter’s entire life combined. I don’t know what sorcery was used to engineer a diaper that actively funnels poop toward the worst possible escape route, but here we are.
And because I was foolishly optimistic, I bought a month’s supply. So now I'm locked in a psychological battle with my own stubbornness. I could throw them out, but that would be admitting defeat. So instead, I soldier on, knowing each diaper change is another step into madness.
Please, learn from my mistake. You don’t have to live like this. Let me be your tribute, the sacrificial parent who suffered so you don’t have to. We’re already running on fumes as newborn parents—don’t make it worse by willingly subjecting yourself to these truly useless diapers that will rob you of your last remaining shreds of sanity.
Save yourself. Run.
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Reviewed in the United States on February 26, 2025
★★★★★ 5
DON'T SLEEP ON THESE DIAPERS! (but your baby should)
Size: Size 3 (40 Count)
I was skeptical at first trying out the plush version of this diaper because I thought the mama bear gentle touch was just OK and you can find a better diaper for the same price point. I saw these on prime day for the same price as the gentle touch and said why not. I was very, very impressed. They are soft and flexible with a satin-like exterior; similar to the feel of a hello bello diaper. The plush version definitely feels more quality than the papery gentle touch ones. I first tested the absorbency using 12 oz of water, waited ten minutes and dabbed dabbed dabbed. Seriously NO moisture! In comparison to the gentle touch diaper that had obvious moisture after the same test. I put them to use on my baby, who just for reference is 19lbs, for an overnight and the diaper did not leak and was only damp in the morning, not wet! Amazing. She is a moderate wetter but I still think that performance is great because in comparison to gentle touch, the diaper was wet on the inside after only three hours and I had to consistently use diaper cream so rash wouldn't develop; I would have never used the gentle touch as an overnight diaper. Seriously, for .21 a diaper for size three these diapers are a steal. DONT SLEEP ON THIS DEAL, PICK UP SOME MAMA BEAR PLUSH DIAPERS!
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Reviewed in the United States on July 23, 2024
★★★★★ 3
Not the Same 🤍
Size: Size 2 (184 Count)
I loved the Mama Bear size 1 diapers, so I expected the “plush” size 2s to be the same. Unfortunately, they feel completely different. These seem thinner and not quite as absorbent as the size 1 regular pack.
The design is also really busy, which makes the wetness indicator harder to see at a quick glance. With babies, that little line matters more than you’d think.
I’ll still finish the pack, but I’m not sure I’d repurchase this “plush” version. If you’re choosing between them, I’d recommend sticking with the regular pack instead. In comparison, Huggies still perform better than these for us. 🤍✨
They don’t hold blowouts at all but they do fit well. They’re also not stretchy. I noticed the print on my baby’s legs.
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Reviewed in the United States on March 14, 2026
★★★★★ 5
Great cost efficient option
Size: Size 4 (36 Count)
I switched over from Millie Moon and really like these. They’re affordable, don’t have harmful additives, and are soft and gentle on my babies. Holds a significant amount and doesn’t leak even on overnight wears. I like the simple non character design as well.
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Reviewed in the United States on February 2, 2026
★★★★★ 2
Every other diaper leaked
Size: Size 7 (92 Count)
I bought these diapers because they were the cheapest available to buy with a gift card my family was given. Normally I use the bulk store brands. The diapers were very hit and miss. It varies from diaper to diaper even in a pack. My son does urinate heavily but even before he would get anywhere near a “full” diaper it would leak! Leading to wet pants and messes. We’ve never had this problem with other diaper brands. Even our cloth diapers hold better than half of these did. For note he falls below the max size for these diapers by at least 5 lbs. I don’t plan on repurchasing these because of the leaking issue. Beyond that they were easy to use like any other diaper, didn’t cause diaper rash, held together, but was subpar in absorption.
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Reviewed in the United States on November 19, 2025