LITELOK X1: shackle legs are elliptical, 25.5mm x 22.5mm with the polymer coating (18.6mm x 20mm without coating). Internal width 106mm.

LITELOK X3: shackle legs 27.5mm x 24.0mm with coating (22.5mm x 20mm without). Internal width 106mm.

LITELOK X1 PLUS: see the product page for full specifications - the lock is larger than A4, so no standalone printable size guide exists for it yet.

Tactical Mount fitting (X1, X1 PLUS and X3): minimum frame circumference 75mm, maximum 200mm. Overall mounted dimensions are approximately 17.5cm from the mount to the furthest shackle leg (19cm to the lock body edge), and 26.5cm from the top of the shackle to the keyhole for X1/X3 (32.5cm for X1 PLUS). Tactical Mounts are recommended for bicycles only, not motorcycles.

Manufacturing tolerances mean slight variation is possible. Printable size-guide PDFs exist for X1 and X3 (search "Customer Size Guide" on litelok.com) if you'd like to check fit before ordering.