Sidi's Caliper Straps are compatible with their Caliper Buckles (sold separately) to deliver a secure fit with the Soft Instep Closure System.
For cyclocross racing and other low-traction situations, screw Sidi's plated-steel MTB Toe Spikes into your shoes and gain a whole new level of confidence on run-ups through the mud.
Sidi's Caliper Buckles replace any Sidi ratchet system to get you back on the road. With precise tightening and simple loosening mechanisms, the Caliper Buckles keep your shoes secure. Retrofitting them onto older Sidis requires replacing the straps with Caliper Straps (sold separately).