Sirius S5

A Pipedream classic, the Sirius is reborn. Like the brightest star in the night sky, this bike is an absolute scorcher, ready to light up your trails and burn off the competition.

Go far, go fast, but most importantly, go for fun. This is the short travel bike we’ve always dreamed of, a fusion of modern geometry, exceptional engineering and short travel efficiency. Is this Downcountry? Is this XXXC? We don’t care, this is mountain biking.

Based around a fork from 0 to 120mm of travel, the Sirius is all about fast, comfortable efficiency. Modern short travel forks are more capable than ever and have opened up what we can expect from a short travel hardtail.

With a rigid fork, the Sirius can be a confident adventure bike to take into the back of beyond. With a burly 120mm fork, it can run alongside the ‘big’ bikes and go play in the mud and on the steeps. Push it hard, cruise for hours, race XC or take it bike-packing: the options are limitless.

Sirius geometry opens up the possibilities of how confident you can be on a short travel hardtail. Forget steep head angles and super high top tubes, we live in a world of slack head angles and long dropper posts. The Sirius delivers modern geometry, encouraging the rider to push things further.

Useful things to know.

Colours.

Optional add-on.

A rigid 29er CrMo fork is available which compliments the frame and is perfect for load-carrying, bike-packing duties.

Straight from the horse’s mouth.

“…an intelligent discussion about the modern state of the hardtail and geometry.” – Hardtail Party

Technical information data sheet.

Custom tubing.

Frame only. Images of bike for illustration only. Specification of frame is subject to change without prior notice.

*The frame is optimised to work with a typical 100-120mm 29er fork and geometry numbers as listed are with a 100mm fork (sagged). Stack with a typical 120mm fork (static, no sag) is 605mm i.e. +19mm.

If you have any questions about our geometry and bike set-up then please contact us: we’re happy to discuss things in more detail.

Drop Optimized Geometry®

This is our philosophy, a combination of what we believe to be the best possible geometry for mountain bikes. A balanced blend of confidence, comfort and efficiency, Drop Optimized Geometry® gives you all the encouragement you need.

“Learn the rules like a pro, so you can break them like an artist.” – Pablo Picasso

Optimize v. (used with object), op·ti·mized, op·ti·miz·ing.

to make as effective, perfect, or useful as possible.
to make the best of.
to take the full advantage of.

Still with us and want to go further? Then read on…

Current dropper posts offer around 100-215mm of adjustment allowing a wide range of riders to fit a frame with a 16.5″/420mm seat tube. Maximum usable length of seat tube is 260mm.

The table below illustrates recommended fitting.

Hardtail Party

“A short-travel hard-charger from the future…unlike any other bike I’ve ridden.” – Hardtail Party

“I’ve never known a bike to climb this well, descend this well and still be this playful.” – Hardtail Party

“What a special bike! It has so much special sauce in all the right places.”  – Hardtail Party

Just Ride Bikes

“…a really capable, but still lightweight and agile, responsive hardtail.” – Just Ride Bikes

“…fast and agile…” – Just Ride Bikes

“…the bike doesn’t hold back at all.” – Just Ride Bikes

“…a supremely fast bike.” – Just Ride Bikes

“Pipedream…continue to prove that hardtails still have a valid place.” – Just Ride Bikes

“…a really, thoroughly capable, and enjoyable trailbike that does everything so well.” – Just Ride Bikes

“A big thumbs up…” – Just Ride Bikes

Mapdec Cycle Works