We went to Shockcraft in New Zealand to get their opinion on the geometry of the Zilch XT170. This was their assessment:
Basic design is a swing-link 4 bar rear suspension. It uses a horst link by the rear axle and a short yoke to drive the shock. This is the most successful rear suspension design in MTB history, it generally pedals well, brakes well, stays stable and has no in-built bad habits. The pivots are well placed in this design also.
The Wheel Curve shows no sudden changes or weird curvature. This gives the bike 45% progression (the shock gains leverage as the suspension compresses) which is more than most in the industry but will work well. In summary the design and layout is good for pedalling, braking and suspension performance. It will work well with most air shocks.
Average leverage ratio is 2.6 which is what everyone else uses. This means the bike will work well with off-the-shelf shocks and won’t be biased towards particularly heavy or light riders with a normal shock installed.
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