The Sirius 4G is the do-it-all hardtail that can hold it’s own in the company of all-mountain full-suspension bikes and is possibly “all the trail bike you’re ever likely to need”.
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″).
IN THE WOODS WITH THE SIRIUS 4G
ABOUT OUR BUILD
Featured builds using a 140mm travel DVO Diamond fork have a 65 degree head angle (+/-0.5). BB height using Maxxis Ikon 2.8″ tyres is 311mm.
Sizes available: 15.5″, 17.0″,18.5″ & 20.0″
Geometry data indicates a 515mm (axle to crown) suspension fork which is the minimum length we’d recommend for optimal performance. Every additional 10mm of fork length will slacken the head angle by approximately 0.5 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||ZS44/28.6 and EC44/40|
|Seat Post||30.9mm||Seat Clamp||34.9mm|
|Stem Length||35-50mm||Sliding Dropout||+16.0mm|
|Effective Wheel Diametre, 27.5×2.45″||708mm||Mitas Kratos 2.45″|
|BB Height, 515mm Fork||290mm|
|BB Height, 552 mm Fork*||293mm||*DVO Diamond, 140mm Travel|
|Effective Wheel Diametre, 27.5×2.8″||726mm||Maxxis Ikon 2.8″|
|BB Height, 515mm Fork||299mm|
|BB Height, 552 mm Fork*||311mm||*DVO Diamond, 140mm Travel|
|Effective Wheel Diametre, 29×2.4″||744mm||Maxxis Ardent 2.4″|
|BB Height, 515mm Fork||308mm|
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
- Oversized head tube for tapered steerer fork.
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
- Frame is ED treated before painting
Specification of frame is subject to change without prior notice.