Pipedream’s redesigned Sirius hardtailJack Luke / Immediate Media
At first glance, the 4130 frameset looks like a pretty standard affair: skinny tubed, long, slack and low. But on closer inspection you begin to notice a lot of nice details throughout.
The bottom bracket junction and the custom machined chainstay yoke is undoubtedly the star of the show, with the widely-spaced rear end easily accommodating a 2.8” tyre with plenty of clearance leftover for mud. The bike will also gladly run 29×2.4” tyres should you wish to run the bike with wagon sized wheels.
A closer look at that chainstay yoke, which can clearly be seen wrapping around the bottom bracket shellJack Luke / Immediate Media
The yoke extends forward, fully wrapping around the bottom bracket shell. This creates a much stronger join compared to simply welding the yoke onto the back of the shell.
The sliding dropouts give singlespeed options for the futureJack Luke / Immediate Media
Out back, sliding dropouts are laced together with a 142x12mm thru-axle, so you can turn the bike into a singlespeed hurt machine should you so wish.
Numbers wise, the 67-degree head angle and 74-degree seat tube are par for the course for a modern, rowdy trail hardtail as is the chunky 44mm headtube.
The frame can also accommodate stealth routed droppers — ours came with a regular external oneJack Luke / Immediate Media
Like many modern bikes, the Sirius is 1x specific with no cable routing for a front mech. There is a nicely welded in port on the seat tube for stealth routed droppers should you decide to build the bike with one.
Pipedream sent us through the bike in a handsome “Charcoal” paint job, but we’re looking forward to seeing the very #enduro sounding “Toxic Lemon” in the flesh.
The hub boasts 102 points of engagement — clicktasticJack Luke / Immediate Media
As a bike that is designed to be fun it made sense that the component selection should reflect this, so Pipedream specced the Sirius with Funn components throughout — a continuation of its long term collaboration with the component manufacturer.
Decked out in full Funn regalia, including the brand’s new UpDown dropper seatpost, the bike looks very cool in its matchy-matchy grey and orange livery.
Our test bike came with the new Zelvy plus-sized rims laced to Funn Fantom hubsJack Luke / Immediate Media
The eagle-eyed will note that the rims are a brand new plus sized offering from Australian carbon specialists, Zelvy. The 36mm wide (internal) rims give the 2.8” Maxxis Ikon+ tyres a healthy, square profile, which should make for a stable and surefooted ride. Laced up to Funn Fantom hubs, which offer a rather impressive 102 points of engagement, these wheels should feel pretty spritely out on the trail.
Given that the bike is such a departure from the original Sirius, we’re looking forward to taking this skinny tubed treat out to the trails to see how it performs.