Evolution geometry applies what we’ve learned over the years from the previous generations of award-winning Sirius and takes it to the next level in our 4th generation, long-travel, semi-skimmed*, slack and low frame that’s ready to rail and riot for “rock-shrugging fun.”
Sliding dropouts give alternative gear options, facilitating the use of an internal gear hub or singlespeed set-up and a custom chainstay yoke will happily accommodate tyres up to 27.5×2.8″ or 29×2.4″, depending on your preference.
* not recommended for full-fat tyres >2.9″
IN THE WOODS WITH THE SIRIUS 4G
Sizes available: 15.5″, 17.0″,18.5″ & 20.0″
Geometry data indicates a 515mm (axle to crown) suspension fork. Each additional 10mm of fork length will slacken/reduce the head angle by approximately 0.5-1.0 degree.
|A: Head Angle||67||67||67||67|
|B: Seat Angle||73||74||74||74|
|C: ST C-T||394||432||470||508|
|D: TT Length (effective)||580||600||620||640|
|E: HT Length||100||105||115||130|
|F: BB Drop||64||64||64||64|
|Fork Length (min/max)||515-555mm||Max Tyre Size||27.5×2.8″/29×2.4″|
|BB Width||73 mm||Headset||44mm (internal)|
|Seat Post||30.9mm||Seat Clamp||34.9mm|
|Stem Length (min/max)||35-70mm|
|Effective Wheel Radius, 27.5×2.8″||726mm|
|BB Height, 515mm Fork||299mm||(726/2)-F||i.e. effective wheel radius/2, minus BB Drop|
|BB Height, 552 mm Fork*||311mm||*DVO Diamond, 140mm Travel|
|Effective Wheel Radius, 29er||744mm|
|BB Height, 515mm Fork||308mm||(744/2)-F||i.e. effective wheel radius/2, minus BB Drop|
For information on Reach & Stack, click here.
ABOUT OUR BUILD
Featured builds using a DVO Diamond fork set at 140mm have a head angle of between 64.5-65.5 degrees and a BB height of 311mm (using Maxxis Rekon 2.8″ tyres).
CrMo 4130 heat treated tubing throughout – read about it here
- DT custom butted and bent for added strength and to eliminate gussets
- DT horizontally ovalised at BB for greater stiffness
- Custom CS/BB yoke for strength and huge tyre clearance
- 44mm (internal) head tube
Sliding/replaceable dropouts: supplied with 142mm bolt-through axle.
- Cable routing for externally or internally activated dropper post
- 1 set of bottle bosses
Matte paint and decals
- Metal headbadge
Specification of frame is subject to change without prior notice.