Suspension Fork InformationUpdated 7 days ago
The suspension fork on the Sirius is a bit of a rare bird.
The 100mm travel fork has a 15x100 axle width and a straight 1-1/8th" steerer tube. Most modern suspension forks are built around a 15x110 axle and tapered 1-1/8th"-1.5" steerer tube. You will be hard pressed to find an upgrade.
That being said, the suspension fork on the V.1 Sirius is still a useful tool for smoothing out the bumps.
To adjust air pressure, you'll need a specialized shock pump. Head down to your LBS (local bike shop) and pick one up. You need a shock pump instead of a standard one because the air spring is small and very high-pressure. We set the fork to ~120psi in the workshop. This works well for a 170-lb rider. You may need to add or remove air pressure based on your weight.
The lockout mechanism atop the right fork leg controls the amount of suspension travel. Dial it all the way clockwise (+) for a full rigid fork, fully anti-clockwise (-) for full travel, or right in the middle for the goldilocks travel option.
This is a friendly reminder that the Sirius is rated to ASTM Condition 2—no drops greater than 12"! Pop curbs, but don't hit that huge tabletop in your local bike park.
Looking to replace your fork? Find one with the following specs:
- ~483mm axle to crown
- 15x100 axle
- Straight 1-1/8th steerer tube