Prime’s upcoming Trail bike doesn’t have a name yet. Even its actual final form and actual geometry details still remain officially under wraps. But Prime is ready to expand beyond gravity bikes, and is both gauging interest in their new trail bike platform, and looking for suggestions on what to name the new bike.

Really, we don’t have a huge amount of concrete detail about the bike beyond this pretty blue prototype preview. But we chatted with Prime’s founder and do know that this shorter travel bike was essentially adapted for more everyday mountain biking versatility by popular demand, based on from their best-selling enduro bike.

Prime Trail prototype 140mm carbon mountain bike

(Photos/Cory Benson)

So what do we really know?

The new Prime Trail bike – whatever name it will get – will, in fact, be an all-new carbon mountain bike frame with all the characteristic Prime styling and suspension. But yes, the prototype showed off at Eurobike appears to simply be one of their current Thunderflash 29er frames built up with a shorter travel fork, shorter stroke shock, and a lighter weight build kit more appropriate for a premium trail bike.

Is it just a repainted Thunderflash?

Prime founder Piotr Siulczynski assures us that the new trail bike will not simply be a rebadged Thunderflash enduro bike with a shorter stroke shock and shorter travel fork, once it is ready to hit the market. But that does really appear to be his starting point.

Siulczynski long held (holds?) the belief that a proper downhill bike is the best choice for riders who just take their bikes to the bikepark. If you regularly go to bikeparks, you’ll see that enduro and even all-mountain bikes often outnumber proper DH or even freeride bikes. And most riders would probably benefit from their longer travel and gravity-tuned suspension designs, if they could get past the double crown forks.

But of course, most mountain bikers don’t keep a fleet of premium bikes at home, and it seems that Prime’s Thunderflash enduro bike outsells the Rocket downhill bike. And riders are simply begging for more versatility.

So Prime will adapt their gravity-proven geometry and short-link 4-bar suspension design for reduced travel and lighter weight, to create bikes that you’ll be happy to pedal to the top, and then shred back down the mountain.

The prototype Prime Trail bike features the same overall S.H.R.E.D. Dynamics suspension design as the enduro bike, and keeps the flip-chip lower shock mount to fine-tune the ride feel.

Tech details

But suspension travel is reduced to 140mm at the rear of the 29er, matched to 140mm forks.

Like their Thunderflash, the Prime Trail bike will feature the same adaptable internal cable routing through ports in the downtube that double as a frame protector at the fork crown. The new bike will also feature a replaceable downtube protector, a cage mount under the downtube where you could mount a tool carrier or spare bottle to get muddy, and a traditional threaded bottom bracket.

Prime didn’t give us an exact timeline of when the new bike would be available, but suggested that it should be a Model Year 2026 bike. We did talk about testing the bike as soon as it is ready, as well as hopefully trying out the new mullet enduro bike this summer or autumn, as well.

New mullet Thunderflash MX enduro & Rocket MX downhill bikes

While the trail prototype was the attention getter at Eurobike. It was a couple of less flashy mullet bike builds that were equally interesting… and available much sooner.

Before Siulczynski officially launched Prime a few years ago, he had been managing gravity racing teams and developing his new bikes… and actually started R&D on 27.5″ wheels. But once the Rocket DH & Thunderflash enduro bikes hit the market, they were full 29ers.

New full-carbon rockers for mixed wheelsizes

Thunderflash MX

Rocket MX

Now, four years later, Prime has managed to adapt mullet versions of the two original bikes. And they did it with minimal overall impact – slightly increasing rear wheel travel on each and tweaking geometry for a more playful feel.

Both bikes keep the same front & rear triangles as before, but add 5mm of rear wheel travel thanks to slightly longer rear wheel size-specific rocker links tuned to the mullet setups. The Thunderflash MX enduro bike gets 170mm of rear wheel travel matched to 170mm forks. And the Rocket MX downhill bike gets 200mm of rear wheel travel, again now matched to the same fork travel.

Bottom bracket height, ride height, and headtube angle all get respective tweaks as well, so the front & rear suspension move in sync, but slightly modified to give the MX mullet bikes a more active suspension feel.

Pricing remains the same for both the mixed wheelsize MX bikes compared to their full 29er counterparts. Frames start around 4150-4350€, and complete bikes from around 7000€ with mechanical drivetrains. But really, the sky is the limit like this Thunderflash MX shows with a SRAM X0 AXS Transmission, Maven brakes, and Fox Factory suspension with the new inverted Podium fork.

Reach out to Prime directly to verify real availability of the new mullet builds, or to offer your suggestion of what to name the new trail bike prototype.

PrimeBicycles.com

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