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Winspace dropped its newest aero road frames in Japan a few days ago. The Winspace M6 (Milemaster) and M5 are the brand’s fresh takes on what a modern endurance‑friendly aero road machine could be. It’s an evolution of the C5 Aero, and it’s designed not just for racers, but for riders who want to go fast for hours, handle rougher roads, and enjoy a bike that feels stable and efficient no matter the ride length.
Early details came through Cycle Sports Japan, and while Winspace hasn’t officially released global specs yet, there’s already a lot we can unpack from the launch and leaked imagery.
What’s New with the M6 (and M5)
From the first photos, it seems the M6 (and M5) have:
A higher stack and shorter reach than the T1600, so you’ll sit a bit more upright, which helps hold an aero position comfortably over long distances.
- A slacker head angle and longer wheelbase, giving it more stability on fast descents or rough roads.
- Dropped seatstays for extra comfort and better airflow.
- A deep aero fork (M5 has a thinner fork), T47 bottom bracket, and flat‑mount discs (clearly visible in closeups).
- Tire clearance advertised up to 700×32C, and it looks like there might even be room for a bit more.
In other words, the M6 feels very much like a 2026‑spec road frame, not a small update, but a proper new platform built for long days and high‑speed efficiency.
Who Are the M6 and M5 for?
The new ‘Milemaster’ frames aren’t trying to be a pure race bike like the T1600. Instead, they are Winspace’s answer to a growing demand for bikes that are fast, comfortable, and versatile all at once. The kind of rig that you can take on a long fondo, an Ironman bike leg (with road bars), or even your weekly group ride without compromise.
They are also 1× and wide‑range 2×‑friendly, showing Winspace clearly has modern endurance riders in mind. If you’re the kind of cyclist who wants one bike that can do almost everything, this looks like it.
How Do They Compare in the Winspace Range?
If we zoom out, the M6 and M5 occupy a smart middle ground between the brand’s existing aero offerings:
- T1550 Gen 2: The classic all‑round aero frame that is fast, efficient, but still has a race‑focused geometry.
- T1600: Winspace’s sharpest, most aggressive, and fastest aero frame with a lower stack and data to back up the performance claims.
- C5 Aero: Winspace endurance aero bike without proper wind-tunnel testing and data to back up its performance.
- M6 and M5: Should be more comfortable, have a longer wheelbase, and be more stable. It should be the bike you’d pick for long training rides, endurance races, or surfaces that aren’t perfect.
Details from the Japanese Launch
According to Cycle Sports Japan, the frame uses Toray M60 carbon fiber, a top‑tier material at this price point, known for stiffness and high strength.
Here’s some information on Japanese pricing and specifications. Remember, the international pricing has not been released yet.
- Frame set: ¥308,000 (~$1,980)
- Complete bike with Shimano 105: ¥448,000 (~$2,880)
- Complete bike with Shimano 105 Di2: ¥498,000 (~$3,200)
- Complete bike with Shimano Ultegra Di2: ¥728,000 (~$4,680)
- Frame weight: ~900g
- Fork: ~450g
- Seatpost: ~130g
- Tire clearance: 700×32C
There’s also a second‑tier sibling, the M5, aimed at riders who want a more budget‑friendly, all‑round aero option without giving up the same design philosophy.
- Frame set: ¥268,000 (~$1,730)
- Complete bike with Shimano 105 (base): ¥348,000 (~$2,240)
- Complete bike with Shimano 105 (special edition): ¥398,000 (~$2,560)
- Complete bike with Shimano 105 Di2: ¥728,000 (~$2,950)
- Frame weight: ~1050g
Final Thoughts
I’m curious to learn more about these frames, but one thing is clear: Winspace’s road frame lineup is getting crowded, and some of the older models (like the C5 or C5 Aero) will soon have to be removed to not confuse customers.
How do you like the M6 and M5 visually? The fork on the M6 seems too bold to me, and it’s not my cup of tea, but I like that Winspace unified their design language (notice the sharp head tube, seatstays, and fork ends).
Use this Winspace discount code CYCLISTSHUB10 at winspace.cc or lunwheels.cc during checkout to get 10% OFF your purchase. Share this code via email.
Preview picture source: instagram.com/asokeisuke
