Nobody had written a single word about a 30.5-inch mountain bike wheel until this weekend, because as far as anyone can tell, it didn’t exist outside of a Cube Action Team workshop. Then Pinkbike broke the story: Zakarias Johansen rolled up to the start tape at the 2026 UCI Mountain Bike Enduro and E-Enduro World Championships in Finale Ligure, Italy, on a modified Cube Fritzz running a 30.5-inch wheel up front and a standard 29er out back. Mullet, but not the mullet you know.

We’ve been watching wheel sizes creep upward all year — 29-inch wheels approved for XC racing at a larger 32-inch diameter, then a 32/27.5 mega-mullet racing DH Worlds in Val di Sole in August. Cube just planted a flag in the gap between 29 and 32 that nobody else has bothered to claim. One rider, one bike, one weekend. That’s the entire sample size so far, and it’s worth understanding exactly why before you get excited or roll your eyes.

Quick Take

Rider	Zakarias Johansen, Cube Action Team
Wheels	30.5in front / 29in rear — a mullet, not a mega-mullet
Bike	Modified Cube Fritzz, the production high-pivot enduro platform we covered in August
Fork	Fox Podium, travel and setup adjusted for the larger front wheel
Front tire	Schwalbe Magic Mary, 30.5in — the only tire on the planet built for this size
Event	2026 UCI MTB Enduro & E-Enduro World Championships, Finale Ligure, Oct 17-18, 2026
Production status	Unconfirmed. Cube has not said whether this reaches customers
Best for	Watching. This is a one-rider prototype, not a buying decision
Skip if	You want a spec sheet, a price, or literally any tire other than one Schwalbe model

What Is a 30.5-Inch Mullet Wheel Setup?

A 30.5-inch mullet setup pairs a 30.5-inch front wheel with a standard 29-inch rear wheel on the same bike. The oversized front wheel increases rollover at the point of impact — the wheel most exposed to square-edge hits and braking bumps — while the smaller rear wheel keeps the back end compact for cornering clearance and shorter chainstays. It sits between the established 29er and the still-experimental 32-inch format, splitting the difference rather than committing to either extreme.

A Modified Fritzz, Not a New Bike

Cube didn’t build a new frame for this. Johansen’s bike is a Fritzz — the carbon high-pivot enduro platform Cube brought back from the dead in August, the one that ships mullet-by-default at 29in front / 27.5in rear with a second dropout set for full 29er. Neither of those configurations is what’s racing this weekend. Cube swapped the front end for a 30.5-inch wheel and kept the rear at 29, which means this isn’t a dropout-swap job. Clearances, fork offset, and headset geometry all needed attention to make a wheel that size fit inside a frame that wasn’t designed around it.

That’s consistent with how Cube has approached the Fritzz generally — build the platform to flex, then let the race team push the edges of what it can take. It’s also why this is Johansen’s bike and nobody else’s. Retrofitting one frame for a one-off wheel size is a weekend project for a factory mechanic. Doing it across a production run is an entirely different undertaking, and Cube hasn’t said it’s attempting that yet.

The Fork Had to Change Too

A bigger front wheel doesn’t just need clearance. It changes the bike’s front-end geometry — axle-to-crown length goes up, which raises the front end and slackens the head angle unless something compensates. Cube’s answer was the Fox Podium, the inverted fork we tested back in February and liked specifically for its off-the-top sensitivity on technical, square-edged terrain. Per Bikerumor’s reporting, Cube made travel and internal setup changes to the Podium to keep the Fritzz’s geometry in the range Johansen actually wants, rather than just bolting a bigger hoop into an unmodified fork and hoping the numbers worked out.

That detail matters more than it looks. The Podium was already the fork Cube — and Fox — positioned for riders who live in rough, technical, square-edge terrain at moderate speed, which happens to be exactly where a larger front wheel should theoretically help most. Pairing the two isn’t an accident. It’s the fork that made the most sense to adapt first.

The Tire Problem: One Company, One Model

Here’s the part that actually limits this experiment right now. Schwalbe is currently the only tire manufacturer producing a 30.5-inch tire, and the one they’ve built is a Magic Mary — their gravity-focused, high-grip enduro and DH tread, the tire we’ve already put through a 1,086-mile radial test at more conventional sizes. No casing options. No tread alternatives. No rival brand racing to catch up yet.

That’s the same bottleneck the 32-inch format hit at launch — Maxxis built one Aspen tread for 32-inch XC bikes and nothing else existed for months. A brand-new wheel diameter is useless without a tire that fits it, and right now there’s exactly one SKU on the entire planet that does. If Johansen flats that front tire mid-stage with no spare on hand, there’s no second option to bolt on.

How Does a 30.5-Inch Wheel Compare to 29 and 32?

Cube Action Team’s internal testing, per Bikerumor’s and Pinkbike’s reporting from Finale Ligure, breaks down into three claims:

1. Faster than a 29er on straight, high-speed sections. The larger diameter carries momentum better over chatter and small bumps, the same rollover advantage that’s driven every wheel-size increase mountain biking has gone through.
2. Easier to turn than a full 32-inch wheel. A 30.5-inch front wheel adds less rotational mass and less wheelbase-altering reach than 32, so it doesn’t fight the rider through tight, technical corners the way a bigger hoop can.
3. A middle setting, not a replacement for either size. Cube isn’t claiming 30.5 beats 29 everywhere or beats 32 everywhere — the pitch is that it’s a compromise point between straight-line speed and cornering agility, picking up some of 32’s rollover benefit without all of its handling penalty.

Take that as a factory team’s claim, not an independently verified result. One rider on one course in one set of conditions isn’t a controlled test, and Cube hasn’t published data to back the comparison up.

29 vs 30.5 vs 32: The Honest Breakdown

	29-inch	30.5-inch	32-inch
Tire options	Hundreds, every brand	One — Schwalbe Magic Mary	One — Maxxis Aspen (XC only)
Frame/fork compatibility	Universal	One modified Fritzz	A handful of dedicated prototypes
Rollover on square edges	Good	Better, per Cube’s claim	Best, in theory
Cornering agility	Best of the three	Close behind 29	Noticeably slower to turn
Race-proven	15+ years, every discipline	One rider, one weekend	XC only, plus Maes’s DH mega-mullet in August
Buy one today	Yes	No — not sold, not confirmed	No — XC bikes only, four brands

The 32-inch format at least has a UCI ruling behind it for XC and a handful of brands building toward production. The 30.5-inch wheel has none of that yet. It has one bike, one tire, and one rider willing to race it at the highest level the discipline offers.

One Rider, No Confirmed Production

Per Bikerumor, Johansen is the only rider at this year’s Enduro Worlds running a 30.5-inch wheel. Not a trend among Cube’s roster, not a format other teams are quietly testing in the paddock — one bike. Cube hasn’t confirmed whether the size reaches production at all, let alone on what timeline or at what price.

That puts this squarely in prototype territory, closer to Martin Maes’s one-off 32/27.5 mega-mullet at DH Worlds than to the 32-inch XC bikes BMC, Norco, and Zinn actually shipped to customers in April. Maes’s bike was a stated one-off from the start. Cube hasn’t said that explicitly about Johansen’s Fritzz, but nothing about a single modified frame, a single borrowed fork setup, and a single tire that exists in one size suggests otherwise.

What We’re Watching For

Whether 30.5 outperforms 29 and 32 in actual race results, not just internal testing claims. A factory team saying its own prototype is faster is the least surprising sentence in racing. Stage times against riders on 29ers and the rare 32-inch setup will tell the real story.

Whether Schwalbe stays alone, or a second tire brand commits. One tire, one tread, one casing option is a hard ceiling. The 32-inch format needed Maxxis to make real tooling investment before anyone could buy a bike; 30.5 needs the same commitment, and right now it has a single model from a single brand.

Whether Cube says anything concrete about production. “Unconfirmed” covers everything from “shipping next season” to “this never leaves the race team.” Until Cube states a direction, every number here belongs to one bike.

Who Should Actually Care About This

Enduro racers and wheel-size nerds who’ve been tracking the 29-to-32 progression. This is the first real data point in the gap between those two formats, even if the sample size is one rider.

Anyone who found the full 32-inch jump too aggressive. If the pitch of “faster in a straight line, still turns like a smaller wheel” holds up past this weekend, 30.5 is the version of bigger wheels built for riders who didn’t want to give up cornering feel entirely.

Nobody shopping for a bike this year. There’s nothing to buy. There’s one bike, one rider, and zero retail path. Treat this as a research weekend, not a launch.

The Bottom Line

Cube picked the biggest stage available — a UCI World Championship — to debut a wheel size that didn’t exist in any catalog a month ago. That’s either confidence in what their internal testing found, or a factory team using a race weekend to generate exactly the kind of coverage this post is. Probably both, and that’s fine. Racing has always been where wheel-size experiments get their first real stress test, from 29ers in XC to mullets in DH to 32-inch wheels this year.

What happens next matters more than this weekend’s result. If Schwalbe stays the only tire maker and Cube stays quiet on production, 30.5 ends up a footnote — an interesting one-off, like plenty of World Cup prototypes before it. If a second tire brand commits and Cube says the word “production,” this is the gap between 29 and 32 finally getting filled. Right now, it’s one rider’s bet, raced once, at the biggest race of the season.

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Race details, equipment specs, and testing claims sourced from Pinkbike, Bikerumor, Escape Collective, Canadian Cycling Magazine, and brujulabike, all reporting from Finale Ligure during the 2026 UCI Mountain Bike Enduro and E-Enduro World Championships, Oct 17-18, 2026. Cube has not published an official statement confirming production plans for the 30.5-inch wheel at time of publication.